CVE-2026-58520 UrlShortener defaults to ineffective validation open to third-party redirects
Attackers can exploit weak validation in the UrlShortener extension to redirect users to malicious third-party sites.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-58520?
CVE-2026-58520 is a medium-severity vulnerability in Mediawiki Mediawiki, published on 1 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-601
Which versions are affected by CVE-2026-58520?
It affects 1 product.
Products include Mediawiki Mediawiki.
How do I fix CVE-2026-58520?
Upgrade to a fixed version.
Is CVE-2026-58520 being exploited?
There is no known exploitation of CVE-2026-58520 in the wild and no public exploit code.
Other vulnerabilities in Mediawiki Mediawiki
Sources
Also known as GHSA-q84p-w2wj-782m, MINI-5qpm-hr62-pw2p, MINI-ccr3-89p3-5346, MINI-xmf3-4v5f-25gj.