CVE catalog

CVE-2026-21631

Lack of output escaping leads to a XSS vector in the…

[CVE catalog]

Lack of output escaping leads to a XSS vector in the multilingual associations component.

Severity
Medium · CVSS 5.9CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N/E:U/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
Published
Source
[NVD] · [CVE record]
EPSS
0.22% · Oct 27, 2026

Reported versions and fixes

Each observation applies to its named package, distribution, and release. Distribution backports can fix a vulnerability while retaining an older upstream version number.

Version impact has not been established. The original provider fields are retained below.

Provider details and historical evidence
Original provider fields
{
  "package_releases": [],
  "fixed_versions": [],
  "distribution_packages": [
    {
      "name": "joomla\\!",
      "ecosystem": "cpe",
      "fixed_version": "5.4.4"
    },
    {
      "name": "joomla\\!",
      "ecosystem": "cpe",
      "fixed_version": "6.0.4"
    },
    {
      "name": "joomla\\!",
      "ranges": [
        {
          "fixed": "6.0.4",
          "introduced": "6.0.0",
          "last_affected": "",
          "start_excluding": ""
        }
      ],
      "ecosystem": "cpe",
      "fixed_version": "6.0.4",
      "provider_record_id": "NVD-CVE-2026-21631"
    }
  ]
}

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

Observed:

References

[CERT-Bund public advisories] · [FIRST EPSS] · [National Vulnerability Database (NVD)]