CVE-2026-58520

UrlShortener defaults to ineffective validation open to third-party redirects

MEDIUM

6.1

CVSS Score

Published: July 1, 2026 at 05:14 PM UTC

Updated: October 25, 2026 at 04:10 PM UTC

2 products affected across 2 vendorsMediaWikiMediaWiki

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Severity

MEDIUM6.1

Exploit prediction

EPSS 0.3%

SSVC

No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

MediaWiki · Mediawiki

95%

1.43.0 ≤ v < 1.43.91.44.0 ≤ v < 1.44.61.45.0 ≤ v < 1.45.4

Affected range stops below 1.43.9, so it looks safe — our inference, not a vendor statement

Affected range stops below 1.44.6, so it looks safe — our inference, not a vendor statement

Affected range stops below 1.45.4, so it looks safe — our inference, not a vendor statement

MediaWiki · Wikimedia

90%

v < 1.43.9, 1.44.6, 1.45.4

Affected range stops below 1.43.9, 1.44.6, 1.45.4, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (2)

Issue Tracking

Source: cverecord

https://phabricator.wikimedia.org/T418431

Issue Tracking

Source: cverecord

https://gerrit.wikimedia.org/r/q/I7a59cc4c351b5aa47ed46f7a14a1105fd1ecc5b5

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.1MEDIUM[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: REQUIRED
Scope: CHANGED
Confidentiality: LOW
Integrity: LOW
Availability: NONE

Vector?

Quick Info

StatusANALYZED

CWE

CWE-601

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