CVE-2026-58520 in MediaWiki UrlShortener Extension
URL redirection to untrusted site ('open redirect') vulnerability in The Wikimedia Foundation Mediawiki - UrlShortener Extension allows Cross-Site Flashing. This issue affects Mediawiki - UrlShortener Extension: from * before 1.43.9, 1.44.6, 1.45.4.
Quick answer
Wikimedia Foundation MediaWiki UrlShortener Extension should be reviewed and updated if it matches the affected versions. The recommended fix is to apply the vendor-supported patched version or the mitigation steps below, then retest the public website with Fixnx.
Who is affected
Affected versions
- MediaWiki UrlShortener Extension before 1.43.9, 1.44.6, and 1.45.4
Fixed versions
- MediaWiki UrlShortener Extension 1.43.9, 1.44.6, or 1.45.4 or later
How to fix it
CVE-2026-58520 affects MediaWiki UrlShortener Extension. In simple terms, users may be sent to a site they did not expect. Update to MediaWiki UrlShortener Extension 1.43.9, 1.44.6, or 1.45.4 or later. If you cannot update today, limit who can reach this system until the fix is done.
- Find every place where MediaWiki UrlShortener Extension is installed or used.
- Check if the version matches: MediaWiki UrlShortener Extension before 1.43.9, 1.44.6, and 1.45.4.
- Update to: MediaWiki UrlShortener Extension 1.43.9, 1.44.6, or 1.45.4 or later.
- If you cannot update now, allow only trusted users and trusted networks.
- Check logs for crashes, strange requests, failed logins, or unexpected access.
- Change secrets or passwords if you think data may have been exposed.
Scan now. Google sign-in is only needed to unlock fix guidance.
Verify the fix
- Confirm the installed version is now: MediaWiki UrlShortener Extension 1.43.9, 1.44.6, or 1.45.4 or later.
- Confirm the risky feature is no longer exposed to untrusted users.
- Run the affected workflow again and make sure it still works.
- Review logs again after the update.
- Run a new Fixnx scan if this software is part of a public website.
Related categories
Trusted references
FAQ
What is affected by CVE-2026-58520?
Wikimedia Foundation MediaWiki UrlShortener Extension versions listed as affected should be reviewed: MediaWiki UrlShortener Extension before 1.43.9, 1.44.6, and 1.45.4.
What should I fix first?
Start with internet-facing sites, admin panels, login flows, plugins, themes, modules, packages, and systems that process user-controlled input or sensitive data.
How do I confirm the fix worked?
Apply the patched version or mitigation, clear caches where relevant, retest the affected workflow, and run a new Fixnx scan to verify public website exposure signals.
How are Fixnx security risk categories chosen?
Fixnx keeps one canonical risk page and assigns only broad, relevant categories such as ecosystem, technology area, or vulnerability class.