Vulnerability-Lookup

CVE-2026-63003 (GCVE-0-2026-63003)

Vulnerability from cvelistv5 – Published: 2026-08-20 18:09 – Updated: 2026-08-21 21:46

Title

django CMS: Broken access control in page *Duplicate* allows reading the content of any page (cross-site / restriction bypass)

Summary

django CMS is an easy-to-use and developer-friendly enterprise content management system powered by Django. Prior to 5.0.9, page duplication lacks an object-level authorization check on the source page. In cms/admin/forms.py, DuplicatePageForm.source accepts any Page, the AddPageForm constructor does not narrow a hidden source field, AddPageForm.clean does not validate the source against the user, and AddPageForm.save calls from_source. In cms/admin/pageadmin.py, duplicate and PageAdmin.has_add_permission check only whether a staff user may add a page. A crafted source value can therefore copy every placeholder and plugin from an unauthorized page with permissions=False, stripping source view restrictions and exposing content across sites or restricted subtrees when CMS_PERMISSION is enabled. This issue is fixed in versions 5.0.9.

Severity

6.5 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-21 20:58 UTC

CWE

CWE-639 - Authorization Bypass Through User-Controlled Key
CWE-862 - Missing Authorization

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7637 records in the last 180 days details

References

4 references

URL	Tags
https://github.com/django-cms/django-cms/security…	x_refsource_CONFIRM
https://github.com/django-cms/django-cms/pull/8713	x_refsource_MISC
https://github.com/django-cms/django-cms/commit/3…	x_refsource_MISC
https://github.com/django-cms/django-cms/releases…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
django-cms	django-cms	Affected: < 5.0.9	guessed

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-63003",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-21T20:58:41.902595Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-08-21T21:46:19.864Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "django-cms",
          "vendor": "django-cms",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 5.0.9"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "django CMS is an easy-to-use and developer-friendly enterprise content management system powered by Django. Prior to 5.0.9, page duplication lacks an object-level authorization check on the source page. In cms/admin/forms.py, DuplicatePageForm.source accepts any Page, the AddPageForm constructor does not narrow a hidden source field, AddPageForm.clean does not validate the source against the user, and AddPageForm.save calls from_source. In cms/admin/pageadmin.py, duplicate and PageAdmin.has_add_permission check only whether a staff user may add a page. A crafted source value can therefore copy every placeholder and plugin from an unauthorized page with permissions=False, stripping source view restrictions and exposing content across sites or restricted subtrees when CMS_PERMISSION is enabled. This issue is fixed in versions 5.0.9."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-639",
              "description": "CWE-639: Authorization Bypass Through User-Controlled Key",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-862",
              "description": "CWE-862: Missing Authorization",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-20T18:09:13.988Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/django-cms/django-cms/security/advisories/GHSA-6x92-6vx4-5fwr",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/django-cms/django-cms/security/advisories/GHSA-6x92-6vx4-5fwr"
        },
        {
          "name": "https://github.com/django-cms/django-cms/pull/8713",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/django-cms/django-cms/pull/8713"
        },
        {
          "name": "https://github.com/django-cms/django-cms/commit/3e1ccf7573eb1a74ebbbfaaa812c1f5cadf14e6c",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/django-cms/django-cms/commit/3e1ccf7573eb1a74ebbbfaaa812c1f5cadf14e6c"
        },
        {
          "name": "https://github.com/django-cms/django-cms/releases/tag/5.0.9",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/django-cms/django-cms/releases/tag/5.0.9"
        }
      ],
      "source": {
        "advisory": "GHSA-6x92-6vx4-5fwr",
        "discovery": "UNKNOWN"
      },
      "title": "django CMS: Broken access control in page *Duplicate* allows reading the content of any page (cross-site / restriction bypass)"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-63003",
    "datePublished": "2026-08-20T18:09:13.988Z",
    "dateReserved": "2026-07-14T23:10:57.032Z",
    "dateUpdated": "2026-08-21T21:46:19.864Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-63003",
      "date": "2026-10-14",
      "epss": "0.00415",
      "percentile": "0.34199"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "product": "django-cms",
                "vendor": "django-cms",
                "versions": [
                  {
                    "status": "affected",
                    "version": "\u003c 5.0.9"
                  }
                ]
              }
            ],
            "source": "security-advisories@github.com"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "django CMS is an easy-to-use and developer-friendly enterprise content management system powered by Django. Prior to 5.0.9, page duplication lacks an object-level authorization check on the source page. In cms/admin/forms.py, DuplicatePageForm.source accepts any Page, the AddPageForm constructor does not narrow a hidden source field, AddPageForm.clean does not validate the source against the user, and AddPageForm.save calls from_source. In cms/admin/pageadmin.py, duplicate and PageAdmin.has_add_permission check only whether a staff user may add a page. A crafted source value can therefore copy every placeholder and plugin from an unauthorized page with permissions=False, stripping source view restrictions and exposing content across sites or restricted subtrees when CMS_PERMISSION is enabled. This issue is fixed in versions 5.0.9."
          }
        ],
        "id": "CVE-2026-63003",
        "lastModified": "2026-09-18T20:09:01.757",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "NONE",
                "baseScore": 6.5,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
                "version": "3.1"
              },
              "exploitabilityScore": 2.8,
              "impactScore": 3.6,
              "source": "security-advisories@github.com",
              "type": "Secondary"
            }
          ],
          "ssvcV203": [
            {
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "ssvcData": {
                "id": "CVE-2026-63003",
                "options": [
                  {
                    "exploitation": "none"
                  },
                  {
                    "automatable": "no"
                  },
                  {
                    "technicalImpact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-21T20:58:41.902595Z",
                "version": "2.0.3"
              }
            }
          ]
        },
        "published": "2026-08-20T19:16:57.163",
        "references": [
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/django-cms/django-cms/commit/3e1ccf7573eb1a74ebbbfaaa812c1f5cadf14e6c"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/django-cms/django-cms/pull/8713"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/django-cms/django-cms/releases/tag/5.0.9"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/django-cms/django-cms/security/advisories/GHSA-6x92-6vx4-5fwr"
          }
        ],
        "sourceIdentifier": "security-advisories@github.com",
        "vulnStatus": "Deferred",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-639"
              },
              {
                "lang": "en",
                "value": "CWE-862"
              }
            ],
            "source": "security-advisories@github.com",
            "type": "Secondary"
          }
        ]
      }
    }
  }
}

FKIE_CVE-2026-63003

Vulnerability from fkie_nvd - Published: 2026-08-20 19:16 - Updated: 2026-09-18 20:09

Severity

6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/django-cms/django-cms/commit/3e1ccf7573eb1a74ebbbfaaa812c1f5cadf14e6c
	security-advisories@github.com	https://github.com/django-cms/django-cms/pull/8713
	security-advisories@github.com	https://github.com/django-cms/django-cms/releases/tag/5.0.9
	security-advisories@github.com	https://github.com/django-cms/django-cms/security/advisories/GHSA-6x92-6vx4-5fwr

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "django-cms",
          "vendor": "django-cms",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 5.0.9"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "django CMS is an easy-to-use and developer-friendly enterprise content management system powered by Django. Prior to 5.0.9, page duplication lacks an object-level authorization check on the source page. In cms/admin/forms.py, DuplicatePageForm.source accepts any Page, the AddPageForm constructor does not narrow a hidden source field, AddPageForm.clean does not validate the source against the user, and AddPageForm.save calls from_source. In cms/admin/pageadmin.py, duplicate and PageAdmin.has_add_permission check only whether a staff user may add a page. A crafted source value can therefore copy every placeholder and plugin from an unauthorized page with permissions=False, stripping source view restrictions and exposing content across sites or restricted subtrees when CMS_PERMISSION is enabled. This issue is fixed in versions 5.0.9."
    }
  ],
  "id": "CVE-2026-63003",
  "lastModified": "2026-09-18T20:09:01.757",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 3.6,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-63003",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-08-21T20:58:41.902595Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-20T19:16:57.163",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/django-cms/django-cms/commit/3e1ccf7573eb1a74ebbbfaaa812c1f5cadf14e6c"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/django-cms/django-cms/pull/8713"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/django-cms/django-cms/releases/tag/5.0.9"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/django-cms/django-cms/security/advisories/GHSA-6x92-6vx4-5fwr"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-639"
        },
        {
          "lang": "en",
          "value": "CWE-862"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

GHSA-6X92-6VX4-5FWR

Vulnerability from github – Published: 2026-08-20 18:42 – Updated: 2026-08-20 18:42

Summary

django CMS: Broken access control in page *Duplicate* allows reading the content of any page (cross-site / restriction bypass)

Details

Impact

The only authorization gate on the duplicate flow is PageAdmin.has_add_permission, which checks user_can_add_page(user, site) / user_can_add_subpage(...) — i.e. “may this user create a page at all”. Nothing checks the user’s relationship to the page being copied:

cms/admin/forms.py — DuplicatePageForm.source = ModelChoiceField(queryset=Page.objects.all(), widget=HiddenInput()) spans every page in the database, on every site.
cms/admin/forms.py — AddPageForm.__init__ returns early when the source widget is hidden, so the queryset is never narrowed to the user’s site/subtree.
cms/admin/forms.py — AddPageForm.clean() validates only URL uniqueness; source is never validated against the user.
cms/admin/pageadmin.py — duplicate() seeds source from the URL only on GET; on POST the value comes entirely from the request body.
cms/admin/forms.py — AddPageForm.save() → from_source() performs source.copy(..., permissions=False) and copies every placeholder and all plugins of source into a new page on the attacker’s site. Because permissions=False drops the source’s view restrictions, the resulting copy is fully readable by the attacker.

This crosses a real privilege boundary: a staff user restricted (via CMS_PERMISSION) to their own site or subtree can exfiltrate the content of restricted pages and of pages belonging to other tenants.

Read-back is trivial (verified): the copy is created on the attacker’s site and, because copy(..., permissions=False) strips the source’s view restrictions, the new page is unrestricted. user_can_view_page() then returns True for it (unrestricted + PUBLIC_FOR), so the attacker — or even an anonymous visitor — can read the duplicated content directly from the front end. No further permission on the new page is required.

Proof of concept

Log in as a staff user attacker who has add page permission but no view/change permission on a target (secret / other-site) page SECRET_ID.
Send (the URL <id> only needs to be a PageContent the attacker can already see — e.g. one of their own pages; the victim id goes in the POST body):

POST /admin/cms/pagecontent/<MY_OWN_PAGECONTENT_ID>/duplicate/ HTTP/1.1
Cookie: sessionid=<attacker session>
Content-Type: application/x-www-form-urlencoded

csrfmiddlewaretoken=...&title=x&slug=x&language=en&source=<SECRET_ID>

A new, unrestricted page is created under the attacker’s site containing a verbatim copy of the secret page’s plugins, which the attacker can now preview/edit/read.

Patches

Enforce an object-level permission check on source:

class DuplicatePageForm(AddPageForm):
    source = forms.ModelChoiceField(
        queryset=Page.objects.all(),
        required=True,
        widget=forms.HiddenInput(),
    )

    def clean_source(self):
        source = self.cleaned_data.get("source")
        if source and not user_can_view_page(self._user, source):
            raise ValidationError(_("You do not have permission to copy this page."))
        return source

(user_can_view_page is imported from cms.utils.page_permissions.)

Workarounds

Until patched, restrict access to the cms.add_page permission to fully-trusted staff, or disable the duplicate action for delegated/limited editors.

References

cms/admin/pageadmin.py — duplicate(), has_add_permission(), get_urls()
cms/admin/forms.py — DuplicatePageForm, AddPageForm.__init__/clean/save/from_source
Regression tests: cms/tests/test_forms.py::DuplicatePageFormSecurityTestCase

Severity

6.5 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 5.0.8"
      },
      "package": {
        "ecosystem": "PyPI",
        "name": "django-cms"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "5.0.9"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-63003"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-639",
      "CWE-862"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-08-20T18:42:44Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "## Impact\n\nThe only authorization gate on the duplicate flow is `PageAdmin.has_add_permission`,\nwhich checks `user_can_add_page(user, site)` / `user_can_add_subpage(...)` \u2014 i.e. *\u201cmay\nthis user create a page at all\u201d*. Nothing checks the user\u2019s relationship to the page being\ncopied:\n\n- `cms/admin/forms.py` \u2014 `DuplicatePageForm.source = ModelChoiceField(queryset=Page.objects.all(), widget=HiddenInput())`\n  spans **every page in the database, on every site**.\n- `cms/admin/forms.py` \u2014 `AddPageForm.__init__` returns early when the `source` widget is\n  hidden, so the queryset is **never narrowed** to the user\u2019s site/subtree.\n- `cms/admin/forms.py` \u2014 `AddPageForm.clean()` validates only URL uniqueness; `source` is\n  never validated against the user.\n- `cms/admin/pageadmin.py` \u2014 `duplicate()` seeds `source` from the URL **only on GET**; on\n  POST the value comes entirely from the request body.\n- `cms/admin/forms.py` \u2014 `AddPageForm.save()` \u2192 `from_source()` performs\n  `source.copy(..., permissions=False)` and copies **every placeholder and all plugins** of\n  `source` into a new page on the attacker\u2019s site. Because `permissions=False` drops the\n  source\u2019s view restrictions, the resulting copy is fully readable by the attacker.\n\nThis crosses a real privilege boundary: a staff user restricted (via `CMS_PERMISSION`) to\ntheir own site or subtree can exfiltrate the content of restricted pages and of pages\nbelonging to other tenants.\n\n**Read-back is trivial (verified):** the copy is created on the attacker\u2019s site and, because\n`copy(..., permissions=False)` strips the source\u2019s view restrictions, the new page is\n*unrestricted*. `user_can_view_page()` then returns `True` for it (unrestricted +\n`PUBLIC_FOR`), so the attacker \u2014 or even an anonymous visitor \u2014 can read the duplicated\ncontent directly from the front end. No further permission on the new page is required.\n\n## Proof of concept\n\n1. Log in as a staff user `attacker` who has *add page* permission but **no** view/change\n   permission on a target (secret / other-site) page `SECRET_ID`.\n2. Send (the URL `\u003cid\u003e` only needs to be a `PageContent` the attacker can already see \u2014\n   e.g. one of their own pages; the victim id goes in the POST body):\n\n```http\nPOST /admin/cms/pagecontent/\u003cMY_OWN_PAGECONTENT_ID\u003e/duplicate/ HTTP/1.1\nCookie: sessionid=\u003cattacker session\u003e\nContent-Type: application/x-www-form-urlencoded\n\ncsrfmiddlewaretoken=...\u0026title=x\u0026slug=x\u0026language=en\u0026source=\u003cSECRET_ID\u003e\n```\n\n3. A new, unrestricted page is created under the attacker\u2019s site containing a verbatim\n   copy of the secret page\u2019s plugins, which the attacker can now preview/edit/read.\n\n## Patches \n\nEnforce an object-level permission check on `source`:\n\n```python\nclass DuplicatePageForm(AddPageForm):\n    source = forms.ModelChoiceField(\n        queryset=Page.objects.all(),\n        required=True,\n        widget=forms.HiddenInput(),\n    )\n\n    def clean_source(self):\n        source = self.cleaned_data.get(\"source\")\n        if source and not user_can_view_page(self._user, source):\n            raise ValidationError(_(\"You do not have permission to copy this page.\"))\n        return source\n```\n\n(`user_can_view_page` is imported from `cms.utils.page_permissions`.)\n\n## Workarounds\n\nUntil patched, restrict access to the `cms.add_page` permission to fully-trusted staff, or\ndisable the duplicate action for delegated/limited editors.\n\n## References\n\n- `cms/admin/pageadmin.py` \u2014 `duplicate()`, `has_add_permission()`, `get_urls()`\n- `cms/admin/forms.py` \u2014 `DuplicatePageForm`, `AddPageForm.__init__/clean/save/from_source`\n- Regression tests: `cms/tests/test_forms.py::DuplicatePageFormSecurityTestCase`",
  "id": "GHSA-6x92-6vx4-5fwr",
  "modified": "2026-08-20T18:42:44Z",
  "published": "2026-08-20T18:42:44Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/django-cms/django-cms/security/advisories/GHSA-6x92-6vx4-5fwr"
    },
    {
      "type": "WEB",
      "url": "https://github.com/django-cms/django-cms/pull/8713"
    },
    {
      "type": "WEB",
      "url": "https://github.com/django-cms/django-cms/commit/3e1ccf7573eb1a74ebbbfaaa812c1f5cadf14e6c"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/django-cms/django-cms"
    },
    {
      "type": "WEB",
      "url": "https://github.com/django-cms/django-cms/releases/tag/5.0.9"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "django CMS: Broken access control in page *Duplicate* allows reading the content of any page (cross-site / restriction bypass)"
}

PYSEC-2026-3821

Vulnerability from pysec - Published: 2026-09-10 09:44 - Updated: 2026-09-10 11:02

Details

Impact

cms/admin/forms.py — DuplicatePageForm.source = ModelChoiceField(queryset=Page.objects.all(), widget=HiddenInput()) spans every page in the database, on every site.
cms/admin/forms.py — AddPageForm.__init__ returns early when the source widget is hidden, so the queryset is never narrowed to the user’s site/subtree.
cms/admin/forms.py — AddPageForm.clean() validates only URL uniqueness; source is never validated against the user.
cms/admin/pageadmin.py — duplicate() seeds source from the URL only on GET; on POST the value comes entirely from the request body.
cms/admin/forms.py — AddPageForm.save() → from_source() performs source.copy(..., permissions=False) and copies every placeholder and all plugins of source into a new page on the attacker’s site. Because permissions=False drops the source’s view restrictions, the resulting copy is fully readable by the attacker.

Proof of concept

Log in as a staff user attacker who has add page permission but no view/change permission on a target (secret / other-site) page SECRET_ID.
Send (the URL <id> only needs to be a PageContent the attacker can already see — e.g. one of their own pages; the victim id goes in the POST body):

POST /admin/cms/pagecontent/<MY_OWN_PAGECONTENT_ID>/duplicate/ HTTP/1.1
Cookie: sessionid=<attacker session>
Content-Type: application/x-www-form-urlencoded

csrfmiddlewaretoken=...&title=x&slug=x&language=en&source=<SECRET_ID>

A new, unrestricted page is created under the attacker’s site containing a verbatim copy of the secret page’s plugins, which the attacker can now preview/edit/read.

Patches

Enforce an object-level permission check on source:

class DuplicatePageForm(AddPageForm):
    source = forms.ModelChoiceField(
        queryset=Page.objects.all(),
        required=True,
        widget=forms.HiddenInput(),
    )

    def clean_source(self):
        source = self.cleaned_data.get("source")
        if source and not user_can_view_page(self._user, source):
            raise ValidationError(_("You do not have permission to copy this page."))
        return source

(user_can_view_page is imported from cms.utils.page_permissions.)

Workarounds

Until patched, restrict access to the cms.add_page permission to fully-trusted staff, or disable the duplicate action for delegated/limited editors.

References

cms/admin/pageadmin.py — duplicate(), has_add_permission(), get_urls()
cms/admin/forms.py — DuplicatePageForm, AddPageForm.__init__/clean/save/from_source
Regression tests: cms/tests/test_forms.py::DuplicatePageFormSecurityTestCase

Severity

6.5 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Impacted products

Name	purl
django-cms	pkg:pypi/django-cms

Aliases

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "django-cms",
        "purl": "pkg:pypi/django-cms"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "5.0.9"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.0.1",
        "2.0.2",
        "2.1.1",
        "2.1.2",
        "2.1.3",
        "2.1.4",
        "2.1.5",
        "2.2",
        "2.2.1",
        "2.3.1",
        "2.3.2",
        "2.3.3",
        "2.3.4",
        "2.3.5",
        "2.3.6",
        "2.3.7",
        "2.3.8",
        "2.4.0",
        "2.4.1",
        "2.4.2",
        "2.4.3",
        "3.0",
        "3.0.1",
        "3.0.10",
        "3.0.11",
        "3.0.12",
        "3.0.13",
        "3.0.14",
        "3.0.15",
        "3.0.16",
        "3.0.17",
        "3.0.18",
        "3.0.2",
        "3.0.3",
        "3.0.4",
        "3.0.5",
        "3.0.6",
        "3.0.7",
        "3.0.8",
        "3.0.9",
        "3.1.0",
        "3.1.0.b1",
        "3.1.0rc1",
        "3.1.0rc2",
        "3.1.1",
        "3.1.2",
        "3.1.3",
        "3.1.4",
        "3.1.5",
        "3.1.6",
        "3.1.7",
        "3.10.0",
        "3.10.0rc1",
        "3.10.0rc2",
        "3.10.1",
        "3.10.1rc1",
        "3.11.0",
        "3.11.1",
        "3.11.10",
        "3.11.11",
        "3.11.1rc1",
        "3.11.2",
        "3.11.3",
        "3.11.4",
        "3.11.5",
        "3.11.6",
        "3.11.7",
        "3.11.8",
        "3.11.9",
        "3.2.0",
        "3.2.1",
        "3.2.2",
        "3.2.3",
        "3.2.4",
        "3.2.5",
        "3.3.0",
        "3.3.0rc2",
        "3.3.0rc3",
        "3.3.0rc4",
        "3.3.1",
        "3.3.2",
        "3.3.3",
        "3.3.4",
        "3.4.0",
        "3.4.1",
        "3.4.2",
        "3.4.3",
        "3.4.4",
        "3.4.5",
        "3.4.6",
        "3.4.7",
        "3.5.0",
        "3.5.1",
        "3.5.2",
        "3.5.3",
        "3.5.4",
        "3.6.0",
        "3.6.0rc1",
        "3.6.0rc3",
        "3.6.1",
        "3.7.0",
        "3.7.0rc1",
        "3.7.0rc2",
        "3.7.1",
        "3.7.2",
        "3.7.3",
        "3.7.4",
        "3.8.0",
        "3.8.0rc1",
        "3.8.1",
        "3.8.2",
        "3.9.0",
        "3.9.0rc1",
        "3.9.0rc2",
        "3.9.0rc3",
        "4.1.0",
        "4.1.0rc1",
        "4.1.0rc2",
        "4.1.0rc3",
        "4.1.0rc4",
        "4.1.0rc5",
        "4.1.1",
        "4.1.10",
        "4.1.11",
        "4.1.2",
        "4.1.3",
        "4.1.4",
        "4.1.5",
        "4.1.6",
        "4.1.7",
        "4.1.9",
        "5.0.0",
        "5.0.0a1",
        "5.0.1",
        "5.0.2",
        "5.0.3",
        "5.0.4",
        "5.0.5",
        "5.0.6",
        "5.0.7",
        "5.0.8"
      ]
    }
  ],
  "aliases": [
    "CVE-2026-63003",
    "GHSA-6x92-6vx4-5fwr"
  ],
  "details": "## Impact\n\nThe only authorization gate on the duplicate flow is `PageAdmin.has_add_permission`,\nwhich checks `user_can_add_page(user, site)` / `user_can_add_subpage(...)` \u2014 i.e. *\u201cmay\nthis user create a page at all\u201d*. Nothing checks the user\u2019s relationship to the page being\ncopied:\n\n- `cms/admin/forms.py` \u2014 `DuplicatePageForm.source = ModelChoiceField(queryset=Page.objects.all(), widget=HiddenInput())`\n  spans **every page in the database, on every site**.\n- `cms/admin/forms.py` \u2014 `AddPageForm.__init__` returns early when the `source` widget is\n  hidden, so the queryset is **never narrowed** to the user\u2019s site/subtree.\n- `cms/admin/forms.py` \u2014 `AddPageForm.clean()` validates only URL uniqueness; `source` is\n  never validated against the user.\n- `cms/admin/pageadmin.py` \u2014 `duplicate()` seeds `source` from the URL **only on GET**; on\n  POST the value comes entirely from the request body.\n- `cms/admin/forms.py` \u2014 `AddPageForm.save()` \u2192 `from_source()` performs\n  `source.copy(..., permissions=False)` and copies **every placeholder and all plugins** of\n  `source` into a new page on the attacker\u2019s site. Because `permissions=False` drops the\n  source\u2019s view restrictions, the resulting copy is fully readable by the attacker.\n\nThis crosses a real privilege boundary: a staff user restricted (via `CMS_PERMISSION`) to\ntheir own site or subtree can exfiltrate the content of restricted pages and of pages\nbelonging to other tenants.\n\n**Read-back is trivial (verified):** the copy is created on the attacker\u2019s site and, because\n`copy(..., permissions=False)` strips the source\u2019s view restrictions, the new page is\n*unrestricted*. `user_can_view_page()` then returns `True` for it (unrestricted +\n`PUBLIC_FOR`), so the attacker \u2014 or even an anonymous visitor \u2014 can read the duplicated\ncontent directly from the front end. No further permission on the new page is required.\n\n## Proof of concept\n\n1. Log in as a staff user `attacker` who has *add page* permission but **no** view/change\n   permission on a target (secret / other-site) page `SECRET_ID`.\n2. Send (the URL `\u003cid\u003e` only needs to be a `PageContent` the attacker can already see \u2014\n   e.g. one of their own pages; the victim id goes in the POST body):\n\n```http\nPOST /admin/cms/pagecontent/\u003cMY_OWN_PAGECONTENT_ID\u003e/duplicate/ HTTP/1.1\nCookie: sessionid=\u003cattacker session\u003e\nContent-Type: application/x-www-form-urlencoded\n\ncsrfmiddlewaretoken=...\u0026title=x\u0026slug=x\u0026language=en\u0026source=\u003cSECRET_ID\u003e\n```\n\n3. A new, unrestricted page is created under the attacker\u2019s site containing a verbatim\n   copy of the secret page\u2019s plugins, which the attacker can now preview/edit/read.\n\n## Patches \n\nEnforce an object-level permission check on `source`:\n\n```python\nclass DuplicatePageForm(AddPageForm):\n    source = forms.ModelChoiceField(\n        queryset=Page.objects.all(),\n        required=True,\n        widget=forms.HiddenInput(),\n    )\n\n    def clean_source(self):\n        source = self.cleaned_data.get(\"source\")\n        if source and not user_can_view_page(self._user, source):\n            raise ValidationError(_(\"You do not have permission to copy this page.\"))\n        return source\n```\n\n(`user_can_view_page` is imported from `cms.utils.page_permissions`.)\n\n## Workarounds\n\nUntil patched, restrict access to the `cms.add_page` permission to fully-trusted staff, or\ndisable the duplicate action for delegated/limited editors.\n\n## References\n\n- `cms/admin/pageadmin.py` \u2014 `duplicate()`, `has_add_permission()`, `get_urls()`\n- `cms/admin/forms.py` \u2014 `DuplicatePageForm`, `AddPageForm.__init__/clean/save/from_source`\n- Regression tests: `cms/tests/test_forms.py::DuplicatePageFormSecurityTestCase`",
  "id": "PYSEC-2026-3821",
  "modified": "2026-09-10T11:02:03.431854Z",
  "published": "2026-09-10T09:44:52.697049Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/django-cms/django-cms/security/advisories/GHSA-6x92-6vx4-5fwr"
    },
    {
      "type": "WEB",
      "url": "https://github.com/django-cms/django-cms/pull/8713"
    },
    {
      "type": "WEB",
      "url": "https://github.com/django-cms/django-cms/commit/3e1ccf7573eb1a74ebbbfaaa812c1f5cadf14e6c"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/django-cms/django-cms"
    },
    {
      "type": "WEB",
      "url": "https://github.com/django-cms/django-cms/releases/tag/5.0.9"
    },
    {
      "type": "PACKAGE",
      "url": "https://pypi.org/project/django-cms"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-6x92-6vx4-5fwr"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-63003"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "django CMS: Broken access control in page *Duplicate* allows reading the content of any page (cross-site / restriction bypass)"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

Publication & reservation Sightings KEV catalogs Other timestamps

Loading timeline…

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-63003 (GCVE-0-2026-63003)

FKIE_CVE-2026-63003

GHSA-6X92-6VX4-5FWR

Impact

Proof of concept

Patches

Workarounds

References

PYSEC-2026-3821

Impact

Proof of concept

Patches

Workarounds

References

Tags

Sightings

Nomenclature

Vulnerability timeline

Related by attack behaviour