FKIE_CVE-2026-53963

Vulnerability from fkie_nvd - Published: 2026-07-09 22:17 - Updated: 2026-07-14 02:16
Severity
7.3 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
9.0 (Critical) - CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
Summary
Discourse is an open-source discussion platform. Prior to 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5, a malicious second factor name on an attacker-controlled account was not escaped in the delete confirmation dialog, allowing stored cross-site scripting when an administrator impersonated that account. This issue is fixed in versions 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5.
References
security-advisories@github.comhttps://github.com/discourse/discourse/commit/40de62cddadc65c328a1028ab999f3fa94adbfedPatch
security-advisories@github.comhttps://github.com/discourse/discourse/commit/529e17d4d570a48972e7cf64720e5dd1fdf23ca8Patch
security-advisories@github.comhttps://github.com/discourse/discourse/commit/d92973e51a46cf6dd20c71e6068e6769b67eea5bPatch
security-advisories@github.comhttps://github.com/discourse/discourse/commit/daea5214d833eacbdd3b1a78d99eb14e9cabd915Patch
security-advisories@github.comhttps://github.com/discourse/discourse/releases/tag/v2026.1.5Release Notes
security-advisories@github.comhttps://github.com/discourse/discourse/releases/tag/v2026.4.2Release Notes
security-advisories@github.comhttps://github.com/discourse/discourse/releases/tag/v2026.5.1Release Notes
security-advisories@github.comhttps://github.com/discourse/discourse/releases/tag/v2026.6.0Release Notes
security-advisories@github.comhttps://github.com/discourse/discourse/security/advisories/GHSA-wg5x-7f23-m3r5Mitigation, Vendor Advisory
Impacted products
Vendor Product Version
discourse discourse *
discourse discourse *
discourse discourse *
discourse discourse 2026.6.0
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "discourse",
          "vendor": "discourse",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 2026.1.0-latest, \u003c 2026.1.5"
            },
            {
              "status": "affected",
              "version": "\u003e= 2026.4.0-latest, \u003c 2026.4.2"
            },
            {
              "status": "affected",
              "version": "\u003e= 2026.5.0-latest, \u003c 2026.5.1"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "E41661D7-5D61-44CF-BFEA-57C53057A46F",
              "versionEndExcluding": "2026.1.5",
              "versionStartIncluding": "2026.1.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "E594AEEC-13D5-48EE-AE07-0C3C25FBBC72",
              "versionEndExcluding": "2026.4.2",
              "versionStartIncluding": "2026.4.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "CD722A52-B00A-4548-92CA-807CEB0449B0",
              "versionEndExcluding": "2026.5.1",
              "versionStartIncluding": "2026.5.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:discourse:discourse:2026.6.0:*:*:*:latest:*:*:*",
              "matchCriteriaId": "F2E7E180-2D99-484E-80A8-12F706ABDE65",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Discourse is an open-source discussion platform. Prior to 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5, a malicious second factor name on an attacker-controlled account was not escaped in the delete confirmation dialog, allowing stored cross-site scripting when an administrator impersonated that account. This issue is fixed in versions 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5."
    }
  ],
  "id": "CVE-2026-53963",
  "lastModified": "2026-07-14T02:16:55.580",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 7.3,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.1,
        "impactScore": 5.2,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.0,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "CHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.3,
        "impactScore": 6.0,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-53963",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-07-14T01:17:07.991865Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-07-09T22:17:05.763",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/discourse/discourse/commit/40de62cddadc65c328a1028ab999f3fa94adbfed"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/discourse/discourse/commit/529e17d4d570a48972e7cf64720e5dd1fdf23ca8"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/discourse/discourse/commit/d92973e51a46cf6dd20c71e6068e6769b67eea5b"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/discourse/discourse/commit/daea5214d833eacbdd3b1a78d99eb14e9cabd915"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Release Notes"
      ],
      "url": "https://github.com/discourse/discourse/releases/tag/v2026.1.5"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Release Notes"
      ],
      "url": "https://github.com/discourse/discourse/releases/tag/v2026.4.2"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Release Notes"
      ],
      "url": "https://github.com/discourse/discourse/releases/tag/v2026.5.1"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Release Notes"
      ],
      "url": "https://github.com/discourse/discourse/releases/tag/v2026.6.0"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Mitigation",
        "Vendor Advisory"
      ],
      "url": "https://github.com/discourse/discourse/security/advisories/GHSA-wg5x-7f23-m3r5"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}



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Sightings

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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.
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  • 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.