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CVE-2026-58520 The Wikimedia Foundation CVE debrief

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-07-01T18:16:35.983Z and has not been modified since then. The NVD entry is currently Analyzed. This open redirect vulnerability in Mediawiki - UrlShortener Extension allows Cross-Site Flashing and affects versions before 1.43.9, 1.44.6, 1.45.4. The vulnerability has a CVSS score of 6.9 and is classified as MEDIUM severity. Users of Mediawiki - UrlShortener Extension should apply patches to prevent open redirect attacks.

Vendor
The Wikimedia Foundation
Product
Mediawiki - UrlShortener Extension
CVSS
MEDIUM 6.9
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-01
Original CVE updated
2026-07-09
Advisory published
2026-07-01
Advisory updated
2026-07-09

Who should care

Users of Mediawiki - UrlShortener Extension versions before 1.43.9, 1.44.6, 1.45.4 should apply patches to prevent open redirect attacks. This includes operators, platform administrators, vulnerability management teams, and security teams who need to review and update their deployments.

Technical summary

CVE-2026-58520 is an open redirect vulnerability in Mediawiki - UrlShortener Extension. The issue allows Cross-Site Flashing and affects versions before 1.43.9, 1.44.6, 1.45.4. The vulnerability has a CVSS score of 6.9 and is classified as MEDIUM severity. This vulnerability can be exploited through URL redirection to untrusted sites. Affected users should apply patches to prevent open redirect attacks.

Defensive priority

Medium priority due to CVSS score and potential for Cross-Site Flashing attacks.

Recommended defensive actions

  • Apply patches for Mediawiki - UrlShortener Extension versions before 1.43.9, 1.44.6, 1.45.4
  • Inventory and update vulnerable Mediawiki - UrlShortener Extension installations
  • Monitor for suspicious activity related to Cross-Site Flashing attacks
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
  • Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
  • Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record and NVD detail provide information on the vulnerability and affected versions. Issue tracking references are available for further investigation. The vulnerability allows Cross-Site Flashing and affects Mediawiki - UrlShortener Extension versions before 1.43.9, 1.44.6, 1.45.4. Users should verify their deployments and apply patches accordingly. The CVE record was published on 2026-07-01T18:16:35.983Z and has not been modified since then.

Official resources

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-07-01T18:16:35.983Z and has not been modified since then.