Vulnerability-Lookup

FKIE_CVE-2026-56423

Vulnerability from fkie_nvd - Published: 2026-06-22 14:17 - Updated: 2026-06-23 15:16

Severity

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

Summary

MISP Core contained broken access-control checks in the bulk deletion flows for Event Reports and Sharing Groups. The affected deleteSelection handlers authorized deletion using broad role-level permissions instead of validating authorization for each selected object. For Event Reports, EventReportsController::deleteSelection relied on the global perm_add capability rather than a per-report ownership/authorization check. As a result, a contributor-level user could submit report IDs or UUIDs for reports belonging to other organisations and hard-delete them instance-wide. The fix changed the callback to call EventReport::fetchIfAuthorized($user, $itemId, 'delete') for each selected report before deletion. For Sharing Groups, SharingGroupsController::deleteSelection relied on the global perm_sharing_group capability rather than verifying ownership of each selected sharing group. This allowed a sharing-group-capable user to hard-delete sharing groups owned by other organisations, bypassing the per-object ownership gate used by the single-object delete action. The fix changed the callback to call SharingGroup::checkIfOwner($user, $itemId) for each selected sharing group. An authenticated attacker with the relevant broad role permission could abuse the affected bulk deletion endpoints to delete objects outside their organisation’s authorization scope, causing loss of event-report content or sharing-group configuration across the instance.

References

	URL	Tags
	5a6e4751-2f3f-4070-9419-94fb35b644e8	https://github.com/MISP/MISP/commit/ada02fa6d7558732aa4712fd5e9451cd8c5b7a64	Patch
	5a6e4751-2f3f-4070-9419-94fb35b644e8	https://github.com/MISP/MISP/commit/f99b3f16ef22c7acf10e17036c777759cf031c15	Patch

Impacted products

	Vendor	Product	Version
	misp-project	misp	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "misp",
          "repo": "https://github.com/MISP/misp",
          "vendor": "misp",
          "versions": [
            {
              "lessThanOrEqual": "2.5.41",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "source": "5a6e4751-2f3f-4070-9419-94fb35b644e8"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:misp-project:misp:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "32F75E39-E0FB-4494-9EE1-52BDCF623A43",
              "versionEndExcluding": "2.5.42",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "MISP Core contained broken access-control checks in the bulk deletion flows for Event Reports\u00a0and Sharing Groups. The affected deleteSelection\u00a0handlers authorized deletion using broad role-level permissions instead of validating authorization for each selected object.\n\nFor Event Reports, EventReportsController::deleteSelection\u00a0relied on the global perm_add\u00a0capability rather than a per-report ownership/authorization check. As a result, a contributor-level user could submit report IDs or UUIDs for reports belonging to other organisations and hard-delete them instance-wide. The fix changed the callback to call EventReport::fetchIfAuthorized($user, $itemId, \u0027delete\u0027)\u00a0for each selected report before deletion.\n\n\n\n\nFor Sharing Groups, SharingGroupsController::deleteSelection\u00a0relied on the global perm_sharing_group\u00a0capability rather than verifying ownership of each selected sharing group. This allowed a sharing-group-capable user to hard-delete sharing groups owned by other organisations, bypassing the per-object ownership gate used by the single-object delete action. The fix changed the callback to call SharingGroup::checkIfOwner($user, $itemId)\u00a0for each selected sharing group.\n\n\n\n\nAn authenticated attacker with the relevant broad role permission could abuse the affected bulk deletion endpoints to delete objects outside their organisation\u2019s authorization scope, causing loss of event-report content or sharing-group configuration across the instance."
    }
  ],
  "id": "CVE-2026-56423",
  "lastModified": "2026-06-23T15:16:39.607",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 9.4,
          "baseSeverity": "CRITICAL",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "LOW",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "HIGH",
          "subConfidentialityImpact": "HIGH",
          "subIntegrityImpact": "HIGH",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "version": "4.0",
          "vulnAvailabilityImpact": "HIGH",
          "vulnConfidentialityImpact": "HIGH",
          "vulnIntegrityImpact": "HIGH",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "5a6e4751-2f3f-4070-9419-94fb35b644e8",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-56423",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-06-23T14:03:06.568537Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-06-22T14:17:49.913",
  "references": [
    {
      "source": "5a6e4751-2f3f-4070-9419-94fb35b644e8",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/MISP/MISP/commit/ada02fa6d7558732aa4712fd5e9451cd8c5b7a64"
    },
    {
      "source": "5a6e4751-2f3f-4070-9419-94fb35b644e8",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/MISP/MISP/commit/f99b3f16ef22c7acf10e17036c777759cf031c15"
    }
  ],
  "sourceIdentifier": "5a6e4751-2f3f-4070-9419-94fb35b644e8",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-862"
        }
      ],
      "source": "5a6e4751-2f3f-4070-9419-94fb35b644e8",
      "type": "Secondary"
    }
  ]
}

CVE-2026-56423 (GCVE-0-2026-56423)

Vulnerability from cvelistv5 – Published: 2026-06-22 11:56 – Updated: 2026-06-23 14:19

Title

MISP Core: Broken access control allows instance-wide unauthorized deletion of event reports and sharing groups via bulk deletion endpoints

Summary

Severity

9.4 (Critical)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-862 - Missing Authorization

Assigner

CIRCL

References

2 references

URL	Tags
https://github.com/MISP/MISP/commit/ada02fa6d7558…	patch
https://github.com/MISP/MISP/commit/f99b3f16ef22c…	patch

Impacted products

1 product

Vendor	Product	Version
misp	misp	Affected: 0 , ≤ 2.5.41 (semver)

Credits

Andras Iklody (the Insomniac MISP lead dev) Jeroen Pinoy Claude (the international export version)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-56423",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-23T14:03:06.568537Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-06-23T14:19:14.304Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "misp",
          "repo": "https://github.com/MISP/misp",
          "vendor": "misp",
          "versions": [
            {
              "lessThanOrEqual": "2.5.41",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "remediation developer",
          "value": "Andras Iklody"
        },
        {
          "lang": "en",
          "type": "analyst",
          "value": "Jeroen Pinoy"
        },
        {
          "lang": "en",
          "type": "tool",
          "value": "Claude (the international export version)"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eMISP Core contained broken access-control checks in the bulk deletion flows for \u003cstrong\u003eEvent Reports\u003c/strong\u003e\u0026nbsp;and \u003cstrong\u003eSharing Groups\u003c/strong\u003e. The affected \u003ccode\u003edeleteSelection\u003c/code\u003e\u0026nbsp;handlers authorized deletion using broad role-level permissions instead of validating authorization for each selected object.\u003c/p\u003e\u003cp\u003eFor \u003cstrong\u003eEvent Reports\u003c/strong\u003e, \u003ccode\u003eEventReportsController::deleteSelection\u003c/code\u003e\u0026nbsp;relied on the global \u003ccode\u003eperm_add\u003c/code\u003e\u0026nbsp;capability rather than a per-report ownership/authorization check. As a result, a contributor-level user could submit report IDs or UUIDs for reports belonging to other organisations and hard-delete them instance-wide. The fix changed the callback to call \u003ccode\u003eEventReport::fetchIfAuthorized($user, $itemId, \u0027delete\u0027)\u003c/code\u003e\u0026nbsp;for each selected report before deletion.\u003c/p\u003e\u003cdiv\u003e\u003cbr\u003e\u003c/div\u003e\u003cdiv\u003e\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003eFor \u003c/span\u003e\u003cstrong\u003eSharing Groups\u003c/strong\u003e\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003e, \u003c/span\u003e\u003ccode\u003eSharingGroupsController::deleteSelection\u003c/code\u003e\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003e\u0026nbsp;relied on the global \u003c/span\u003e\u003ccode\u003eperm_sharing_group\u003c/code\u003e\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003e\u0026nbsp;capability rather than verifying ownership of each selected sharing group. This allowed a sharing-group-capable user to hard-delete sharing groups owned by other organisations, bypassing the per-object ownership gate used by the single-object delete action. The fix changed the callback to call \u003c/span\u003e\u003ccode\u003eSharingGroup::checkIfOwner($user, $itemId)\u003c/code\u003e\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003e\u0026nbsp;for each selected sharing group.\u003c/span\u003e\u003c/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c/div\u003e\u003cdiv\u003e\u003cp\u003eAn authenticated attacker with the relevant broad role permission could abuse the affected bulk deletion endpoints to delete objects outside their organisation\u2019s authorization scope, causing loss of event-report content or sharing-group configuration across the instance.\u003c/p\u003e\u003cbr\u003e\u003cbr\u003e\u003c/div\u003e"
            }
          ],
          "value": "MISP Core contained broken access-control checks in the bulk deletion flows for Event Reports\u00a0and Sharing Groups. The affected deleteSelection\u00a0handlers authorized deletion using broad role-level permissions instead of validating authorization for each selected object.\n\nFor Event Reports, EventReportsController::deleteSelection\u00a0relied on the global perm_add\u00a0capability rather than a per-report ownership/authorization check. As a result, a contributor-level user could submit report IDs or UUIDs for reports belonging to other organisations and hard-delete them instance-wide. The fix changed the callback to call EventReport::fetchIfAuthorized($user, $itemId, \u0027delete\u0027)\u00a0for each selected report before deletion.\n\n\n\n\nFor Sharing Groups, SharingGroupsController::deleteSelection\u00a0relied on the global perm_sharing_group\u00a0capability rather than verifying ownership of each selected sharing group. This allowed a sharing-group-capable user to hard-delete sharing groups owned by other organisations, bypassing the per-object ownership gate used by the single-object delete action. The fix changed the callback to call SharingGroup::checkIfOwner($user, $itemId)\u00a0for each selected sharing group.\n\n\n\n\nAn authenticated attacker with the relevant broad role permission could abuse the affected bulk deletion endpoints to delete objects outside their organisation\u2019s authorization scope, causing loss of event-report content or sharing-group configuration across the instance."
        }
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      "impacts": [
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            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "HIGH",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
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          "scenarios": [
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      "problemTypes": [
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          "descriptions": [
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              "description": "CWE-862 Missing Authorization",
              "lang": "en",
              "type": "CWE"
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        "orgId": "5a6e4751-2f3f-4070-9419-94fb35b644e8",
        "shortName": "CIRCL"
      },
      "references": [
        {
          "tags": [
            "patch"
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          "url": "https://github.com/MISP/MISP/commit/ada02fa6d7558732aa4712fd5e9451cd8c5b7a64"
        },
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/MISP/MISP/commit/f99b3f16ef22c7acf10e17036c777759cf031c15"
        }
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      "source": {
        "discovery": "INTERNAL"
      },
      "title": "MISP Core: Broken access control allows instance-wide unauthorized deletion of event reports and sharing groups via bulk deletion endpoints",
      "x_generator": {
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  "cveMetadata": {
    "assignerOrgId": "5a6e4751-2f3f-4070-9419-94fb35b644e8",
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    "cveId": "CVE-2026-56423",
    "datePublished": "2026-06-22T11:56:26.235Z",
    "dateReserved": "2026-06-22T11:56:07.846Z",
    "dateUpdated": "2026-06-23T14:19:14.304Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Detection rules are retrieved from Rulezet.

Action not permitted

FKIE_CVE-2026-56423

CVE-2026-56423 (GCVE-0-2026-56423)

Tags

Sightings

Nomenclature