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Vulnerabilities

Security incident · CVE-2025-53486

The WikiCategoryTagCloud extension is vulnerable to reflected XSS via the linkstyle attribute, which is improperly concatenated into inline HTML without escaping.

Published Jul 7, 2025 · catalog updated Jul 7, 2025 · Wikimedia Foundation Mediawiki - WikiCategoryTagCloud extension

Check this week

CVE-2025-53486 is not in CISA KEV. FIRST estimates a 29.00% chance of exploitation in the next 30 days. Check whether you run Wikimedia Foundation Mediawiki - WikiCategoryTagCloud extension.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium5.4
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
29.00%
Remediation
Version ranges on file
Affected products
vendor Wikimedia Foundation Mediawiki - WikiCategoryTagCloud extension 1.42.x <1.42.7

The WikiCategoryTagCloud extension is vulnerable to reflected XSS via the linkstyle attribute, which is improperly concatenated into inline HTML without escaping. An attacker can inject JavaScript event handlers such as onmouseenter using carefully crafted input via the {{#tag:tagcloud}} parser function, resulting in arbitrary JavaScript execution when a victim hovers over a link in the category cloud. The vulnerability exists because the linkstyle parameter is only passed through Sanitizer::checkCss() (which does not escape HTML) and is then directly inserted into a style attribute using stri

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.

  • vendor Wikimedia Foundation Mediawiki - WikiCategoryTagCloud extension 1.42.x <1.42.71.42.x <1.42.7

How to fix CVE-2025-53486

  • Recommended remediation

    Affected version ranges suggest a fixed boundary. Verify against the vendor advisory for your release.

  • Official advisories

What to do

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

Should you patch?

CVE-2025-53486 is not in CISA KEV. FIRST estimates a 29.00% chance of exploitation in the next 30 days. Check whether you run Wikimedia Foundation Mediawiki - WikiCategoryTagCloud extension.

Which versions are affected?

Compare what you have installed with Wikimedia Foundation Mediawiki - WikiCategoryTagCloud extension 1.42.x <1.42.7 1.42.x <1.42.7. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 29.00%. 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. Jul 7, 2025 · EUVD

    Detected

    The WikiCategoryTagCloud extension is vulnerable to reflected XSS via the linkstyle attribute, which is improperly concatenated into inline HTML without escaping. An attacker can inject JavaScript event handlers such as onmouseenter using carefully crafted input via the {{#tag:tagcloud}} parser function, resulting in arbitrary JavaScript execution when a victim hovers over a link in the category c

  2. Jul 7, 2025 · EUVD

    Updated

    The WikiCategoryTagCloud extension is vulnerable to reflected XSS via the linkstyle attribute, which is improperly concatenated into inline HTML without escaping. An attacker can inject JavaScript event handlers such as onmouseenter using carefully crafted input via the {{#tag:tagcloud}} parser function, resulting in arbitrary JavaScript execution when a victim hovers over a link in the category c

Sources

  • EUVDVulnerability recordEUVD-2025-20242

    The WikiCategoryTagCloud extension is vulnerable to reflected XSS via the linkstyle attribute, which is improperly concatenated into inline HTML without escaping. An attacker can inject JavaScript event handlers such as onmouseenter using carefully crafted input via the {{#tag:ta

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Jul 7, 2025. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.