GHSA-FC46-R95F-HQ7G

Vulnerability from github – Published: 2026-04-13 16:35 – Updated: 2026-04-15 20:52
VLAI?
Summary
Decidim has a cross-site scripting (XSS) in user name
Details

Impact

A stored code execution vulnerability in the user name field allows a low-privileged attacker to execute arbitrary code in the context of any user who passively visits a comment page, resulting in high confidentiality and integrity impact across security boundaries.

Patches

N/A

Workarounds

Not available

References

OWASP ASVS v4.0.3-5.1.3

Credits

This issue was discovered in a security audit organized by octree and made by Secu Labs against Decidim financed by the city of Lausanne (Switzerland).

Severity ?
9.3 (Critical)
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L
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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c 0.31.0"
      },
      "package": {
        "ecosystem": "RubyGems",
        "name": "decidim-core"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.31.0.rc1"
            },
            {
              "fixed": "0.31.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "RubyGems",
        "name": "decidim-core"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.30.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-23891"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-13T16:35:13Z",
    "nvd_published_at": "2026-04-13T17:16:28Z",
    "severity": "CRITICAL"
  },
  "details": "### Impact\nA stored code execution vulnerability in the user name field allows a low-privileged attacker to execute arbitrary code in the context of any user who passively visits a comment page, resulting in high confidentiality and integrity impact across security boundaries.\n\n### Patches\nN/A\n\n### Workarounds\nNot available\n\n### References\nOWASP ASVS v4.0.3-5.1.3\n\n### Credits\nThis issue was discovered in a security audit organized by [octree](https://octree.ch/) and made by [Secu Labs](https://seculabs.ch/) against Decidim financed by the city of Lausanne (Switzerland).",
  "id": "GHSA-fc46-r95f-hq7g",
  "modified": "2026-04-15T20:52:29Z",
  "published": "2026-04-13T16:35:13Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/decidim/decidim/security/advisories/GHSA-fc46-r95f-hq7g"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-23891"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/decidim/decidim"
    },
    {
      "type": "WEB",
      "url": "https://github.com/decidim/decidim/releases/tag/v0.30.5"
    },
    {
      "type": "WEB",
      "url": "https://github.com/decidim/decidim/releases/tag/v0.31.1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Decidim has a cross-site scripting (XSS) in user name"
}


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Sightings

Author Source Type Date

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.