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WikibaseApplication · Wikimedia

CVE-2026-22710

MEDIUM · 5.4 CVSS v3.1 Published 2026-01-09
Patch available
A vendor patch is available. No clean upgrade release — apply the published patch.
See remediation →
58/100
Remediation priority · Elevated
Public exploit Remotely reachable Patch available

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
Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in The Wikimedia Foundation Mediawiki - Wikibase Extension allows Cross-Site Scripting (XSS).This issue affects Mediawiki - Wikibase Extension: 1.45, 1.44, 1.43, 1.39.

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
How this class of weakness works · CWE-79

Untrusted input is placed into a web page without being neutralised, so an attacker's markup or script executes in another user's browser. That can hijack sessions, capture keystrokes, or silently perform actions as the victim. Fixing it properly means context-aware output encoding everywhere data meets HTML, backed by a content-security policy as a second line of defence.

General guidance for the cross-site scripting (xss) class — the official description and references above are authoritative for this specific CVE. Want a bespoke review and a reviewed fix? Ask our team →

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
WikibaseApplication
Affected:= 1.39= 1.43= 1.44= 1.45

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
Low
User interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

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

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
Patch available Apply the vendor patch
Vendor patch gerrit.wikimedia.org →
Recommended fix Moderate confidence

Wikibase 1.46 or later stable release

  1. 1. Identify your current Wikibase installation version (1.39, 1.43, 1.44, or 1.45)
  2. 2. Plan an upgrade to the next stable Wikibase release beyond version 1.45 (e.g., Wikibase 1.46 or later) which should contain the security fix
  3. 3. Review the upgrade notes in the Wikibase/MediaWiki release documentation for any prerequisites
  4. 4. Perform a backup of your database and configuration files before upgrading
  5. 5. Upgrade Wikibase to the fixed version using your deployment method (e.g., composer update, git pull, or package manager)
  6. 6. Verify the upgrade was successful and test that the XSS vulnerability is no longer exploitable
Caveat Review release notes for any breaking changes between your current version and the target version; minor version upgrades in Wikibase typically have low breaking change risk

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

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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-2026-22710 in production — separate from our analysis above.

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What this is

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What belongs here
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  • Version or environment caveats, and links to real fixes
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