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MediawikiCMS

CVE-2026-58520

MEDIUM · 6.1 CVSS v3.1 Published 2026-07-01
Fix available
A fix is available. Upgrade to 1.43.9 / 1.44.6 or later.
See remediation →
68/100
Remediation priority · Elevated
Remotely reachable No privileges 7 weeks old

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
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.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

Open redirect vulnerability in MediaWiki's UrlShortener extension allows attackers to craft malicious shortened URLs that redirect users to untrusted external sites. The vulnerability enables Cross-Site Flashing (XSF), which can be leveraged to bypass certain security controls or perform attacks using Flash content. The flaw exists due to insufficient validation of user-supplied URL parameters in the extension.

MitigationUpgrade MediaWiki UrlShortener extension to version 1.43.9, 1.44.6, or 1.45.4 (or later) to obtain the security patch. If upgrading is not immediately feasible, consider disabling or restricting access to the UrlShortener extension until the patch can be applied.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
MediawikiCMS
Affected:>= 1.43.0, < 1.43.9>= 1.44.0, < 1.44.6>= 1.45.0, < 1.45.4

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Confirm MediaWiki core version
    Access Special:Version on your wiki or check the $wgVersion variable in your LocalSettings.php file
    Affected if The installed version falls within >= 1.43.0 and < 1.43.9, >= 1.44.0 and < 1.44.6, or >= 1.45.0 and < 1.45.4
  2. Verify UrlShortener extension is installed
    Check your LocalSettings.php for any require_once or wfLoadExtension calls referencing 'UrlShortener'. Also check the extensions/UrlShortener directory exists in your installation
    Affected if The UrlShortener extension is present in the installation
  3. Check if UrlShortener is enabled
    Look for 'wfLoadExtension( "UrlShortener" )' or similar loading statements in LocalSettings.php. If found, the extension is enabled
    Affected if The extension is enabled and loaded by MediaWiki
  4. Confirm extension version if available
    Visit Special:Version on your wiki and locate the UrlShortener extension entry to see its specific version number
    Affected if The extension version is below 1.43.9, 1.44.6, or 1.45.4 respectively for your MediaWiki branch

Your environment is affected if MediaWiki core version is in the affected ranges AND the UrlShortener extension is enabled and loaded.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 1.43.9 / 1.44.6 / 1.45.4 or later
Fixed in 1.43.91.44.61.45.4
Interim mitigation

Upgrade MediaWiki UrlShortener extension to version 1.43.9, 1.44.6, or 1.45.4 (or later) to obtain the security patch. If upgrading is not immediately feasible, consider disabling or restricting access to the UrlShortener extension until the patch can be applied.

Recommended fix High confidence

Upgrade to MediaWiki 1.43.9, 1.44.6, or 1.45.4 (or the latest patch release in your respective branch)

  1. 1. Identify the current MediaWiki version by checking the 'includes/Defines.php' file or the Special:Version page
  2. 2. Determine which release branch (1.43.x, 1.44.x, or 1.45.x) the installation is running
  3. 3. If running 1.43.x branch, plan upgrade to 1.43.9 or later
  4. 4. If running 1.44.x branch, plan upgrade to 1.44.6 or later
  5. 5. If running 1.45.x branch, plan upgrade to 1.45.4 or later
  6. 6. Review MediaWiki upgrade instructions at https://www.mediawiki.org/wiki/Manual:Upgrading
  7. 7. Create a full backup of the database and files before upgrading
  8. 8. Disable the UrlShortener extension if upgrade cannot be performed immediately as a temporary mitigation
Caveat Standard MediaWiki minor version upgrades are generally backward compatible; review release notes for any configuration changes

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Mediawiki Scoped from the published advisory
  • Consultation2.0 h
  • Implementation2.0 h
  • Testing2.0 h
  • Review / QA1.0 h
7.0 hours of engineering $1,240
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,984.

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-58520 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data