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7.6

MediaWiki GlobalBlocking Extension Allows Malicious Code Execution

CVE-2025-62656 · published 1 year ago
Summary

The MediaWiki GlobalBlocking extension in certain versions has a vulnerability that allows hackers to inject malicious code into the website. This could allow an attacker to take control of user sessions and steal sensitive information. Update to the latest version of the extension to fix this issue.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
Ecosystem VendorProductAffected versions
Ubuntu:18.04:LTS canonical mediawiki All versions
Ubuntu:Pro:20.04:LTS canonical mediawiki All versions
Ubuntu:Pro:22.04:LTS canonical mediawiki All versions
Ubuntu:Pro:24.04:LTS canonical mediawiki All versions
Ubuntu:25.10 canonical mediawiki All versions
Ubuntu:26.04:LTS canonical mediawiki All versions
Original advisory text
Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in The Wikimedia Foundation MediaWiki GlobalBlocking extension allows Stored XSS.This issue...
Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in The Wikimedia Foundation MediaWiki GlobalBlocking extension allows Stored XSS.This issue affects MediaWiki GlobalBlocking extension: 1.43, 1.44.
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
7.6 High
Exploitation
<1% chance of attack within 30 days
Type
CWE-79Cross-site Scripting (XSS)
Timeline
Published20 Oct 2025
Updated4 Nov 2026
First seen7 Mar 2026
Sources
CVE-2025-62656 · NVD
UBUNTU-CVE-2025-62656 · OSV
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