CVE-2026-58520: UrlShortener defaults to ineffective validation open to third-party redirects

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-01 · updated 2026-10-25
Weakness: CWE-601

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.

Affected products

Wikimedia Foundation MediaWiki: from 1.43.0 before 1.43.9; from 1.44.0 before 1.44.6; from 1.45.0 before 1.45.4 — fixed in 1.43.9, 1.44.6, 1.45.4

How to fix

Upgrade to a fixed version: Wikimedia Foundation MediaWiki 1.43.9, 1.44.6, 1.45.4. Check the vendor advisory for mitigations.

References

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