Medium 6.9Published Jul 1, 2026

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

Updated under an hour ago (Oct 26, 2026, 3:40 PM ET)

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It affects The Wikimedia Foundation Mediawiki - UrlShortener Extension and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for The Wikimedia Foundation Mediawiki - UrlShortener Extension

Exploited in the last 30 days

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.

CVSS: 6.9 MEDIUM (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L
Weakness (CWE): CWE-601
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: wikimedia-foundation
NVD analysis: Analyzed
Record last updated: Jul 1, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

The Wikimedia Foundation Mediawiki - UrlShortener Extension wikimedia_foundation:mediawiki_urlshortener_extension (from the name)	before 1.43.9, 1.44.6, 1.45.4	CNA record
mediawiki mediawiki mediawiki: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	NVD

References

References

https://phabricator.wikimedia.org/T418431	issue-tracking
https://gerrit.wikimedia.org/r/q/I7a59cc4c351b5aa47ed46f7a14a1105fd1ecc5b5	issue-tracking

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.