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Vulnerabilities

Vulnerability · CVE-2026-21631

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

Published Apr 1, 2026 · catalog updated Jun 17, 2026 · Lack of output escaping

Check if you run it

No confirmed exploitation is on record for CVE-2026-21631. EPSS is 0.22%. Act only if a listed version of Lack of output escaping is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Lack of output escaping).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium5.9
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.22%
Remediation
Advisory link
Affected products
cpe joomla/joomla!

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

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe joomla/joomla!version unspecified

How to fix CVE-2026-21631

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-21631. EPSS is 0.22%. Act only if a listed version of Lack of output escaping is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-79: Cross-site Scripting (XSS). EPSS 0.22%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Apr 1, 2026 · NIST NVD

    Detected

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

  2. Jun 17, 2026 · NIST NVD

    Updated

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

Sources

  • CVE.orgVulnerability recordCVE-2026-21631

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-21631

    30-day exploitation probability 0.2%

    first.org
  • NIST NVDVulnerability recordCVE-2026-21631

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

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.