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MEDIUM severity

CVE-2020-10959 — core

MEDIUMFix: wikimedia/mediawiki@d4a552e

CVE-2020-10959 is a medium-severity (CVSS 6.1) Open Redirect vulnerability in mediawiki/core. 1 public exploit or proof-of-concept reference is indexed, so weaponization risk is real. A fix is available for mediawiki/core — see the affected versions and patch details below.

MediaWiki Open Redirect vulnerability

Also known asBIT-mediawiki-2020-10959GHSA-mqhw-wq8p-vf5r
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
1 known
Exploitation data as of Nov 4, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.4%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs73th percentile — riskier than 73% of all scored CVEsHighest risk
0.00%0.64%1.29%1.93%0.3%1.4%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
🐘mediawiki/core

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

resources/src/mediawiki.page.ready/ready.js in MediaWiki before 1.35 allows remote attackers to force a logout and external redirection via HTML content in a MediaWiki page.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistmediawiki/coreall versions1.34.0-rc.0composer require mediawiki/core:^1.34.0-rc.0

Affected Products

1 product · 1 configurations
Application
mediawikimediawiki
< 1.35
range
Exploits & PoCs
1

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

resources/src/mediawiki.page.ready/ready.js in MediaWiki before 1.35 all…

phabricator.wikimedia.orgNVDJun 2020

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for mediawiki/core, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update mediawiki/core to 1.34.0-rc.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2020-10959 is resolved across your whole dependency graph.

  3. Workarounds

    Stop reflecting attacker-controlled destinations: resolve every redirect target against an allowlist of paths or hosts you own, prefer a server-side key over a full URL in the request, and reject absolute URLs entirely where the flow only ever needs a relative one.

Frequently Asked Questions

resources/src/mediawiki.page.ready/ready.js in MediaWiki before 1.35 allows remote attackers to force a logout and external redirection via HTML content in a MediaWiki page.
O3 Security · Impact-Aware SCA

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CVE-2020-10959: core — Fixed in 1.34.0-rc.0