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6.9

Wikimedia Mediawiki BlueSky Skin Allows Malicious Code Execution

CVE-2025-62665 · published 1 year ago
Summary

A security flaw in the BlueSky skin for Wikimedia Mediawiki allows hackers to inject malicious code into websites, potentially stealing user data or taking control of accounts. This affects all versions of the BlueSky skin up to version 1.39. To stay safe, update to the latest version of Mediawiki or switch to a different skin.

Original advisory text
Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation Mediawiki - Skin:BlueSky allows Stored XSS.This issue affects Media...
Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation Mediawiki - Skin:BlueSky allows Stored XSS.This issue affects Mediawiki - Skin:BlueSky: from master before 1.39.
References
Fix within
Internet-facing 60 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker partial control
Severity
6.9 Medium
Exploitation
<1% chance of attack within 30 days
Type
CWE-79Cross-site Scripting (XSS)
Timeline
Published18 Oct 2025
Updated4 Nov 2026
First seen7 Mar 2026
Sources
CVE-2025-62665 · NVD
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