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Vulnerabilities

Vulnerability · CVE-2025-53491

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation Mediawiki - FlaggedRevs Extension allows Cross-Sit

Published Jul 7, 2025 · catalog updated Jul 10, 2025 · Wikimedia Foundation Mediawiki - FlaggedRevs Extension

Last checked Oct 29, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2025-53491. EPSS is 0.20%. Act only if a listed version of Wikimedia Foundation Mediawiki - FlaggedRevs Extension is installed.

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
0.20%
Remediation
Version ranges on file
Affected products
vendor Wikimedia Foundation Mediawiki - FlaggedRevs Extension 1.43.x <1.43.2

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation Mediawiki - FlaggedRevs Extension allows Cross-Site Scripting (XSS).This issue affects Mediawiki - FlaggedRevs Extension: from 1.43.X before 1.43.2.

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 - FlaggedRevs Extension 1.43.x <1.43.21.43.x <1.43.2

How to fix CVE-2025-53491

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-2025-53491. EPSS is 0.20%. Act only if a listed version of Wikimedia Foundation Mediawiki - FlaggedRevs Extension is installed.

Which versions are affected?

Compare what you have installed with Wikimedia Foundation Mediawiki - FlaggedRevs Extension 1.43.x <1.43.2 1.43.x <1.43.2. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.20%. 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

    Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation Mediawiki - FlaggedRevs Extension allows Cross-Site Scripting (XSS).This issue affects Mediawiki - FlaggedRevs Extension: from 1.43.X before 1.43.2.

  2. Jul 10, 2025 · EUVD

    Updated

    Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation Mediawiki - FlaggedRevs Extension allows Cross-Site Scripting (XSS).This issue affects Mediawiki - FlaggedRevs Extension: from 1.43.X before 1.43.2.

Sources

  • CVE.orgVulnerability recordCVE-2025-53491

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-53491

    30-day exploitation probability 0.20%

    first.org
  • EUVDVulnerability recordEUVD-2025-20268

    Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation Mediawiki - FlaggedRevs Extension allows Cross-Site Scripting (XSS).This issue affects Mediawiki - FlaggedRevs Extension: from 1.43.X before 1.43.2.

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 29, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSOct 23, 2026
  • CVE.orgOct 21, 2026
  • EUVDOct 19, 2026