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CRITICAL severity

CVE-2019-12468 — core

CRITICAL

CVE-2019-12468 is a critical-severity (CVSS 9.8) Missing Authentication vulnerability in mediawiki/core. A fix is available for mediawiki/core — see the affected versions and patch details below.

Wikimedia MediaWiki Incorrect Access Control vulnerability

Also known asGHSA-wrhx-3pxr-6vgg
Published
Updated
Affected
4 pkgs
Patched
4 / 4
Exploits
None indexed
Exploitation data as of Nov 3, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
3.3%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs89th percentile — riskier than 89% of all scored CVEsHighest risk
0.00%1.43%2.87%4.30%0.5%3.3%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

4 pkgs affected
🐘mediawiki/core🐘mediawiki/core🐘mediawiki/core🐘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

An Incorrect Access Control vulnerability was found in Wikimedia MediaWiki 1.27.0 through 1.32.1. Directly POSTing to Special:ChangeEmail would allow for bypassing re-authentication, allowing for potential account takeover.

Affected Packages

4 total 4 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistmediawiki/core≥ 1.27.0&&< 1.27.61.27.6composer require mediawiki/core:^1.27.6
🐘Packagistmediawiki/core≥ 1.30.0&&< 1.30.21.30.2composer require mediawiki/core:^1.30.2
🐘Packagistmediawiki/core≥ 1.31.0&&< 1.31.21.31.2composer require mediawiki/core:^1.31.2
🐘Packagistmediawiki/core≥ 1.32.0&&< 1.32.21.32.2composer require mediawiki/core:^1.32.2

Affected Products

2 products · 2 configurations
OS
debian linuxdebian
1 version
9.0
Application
mediawikimediawiki
≥ 1.27.0 && ≤ 1.32.1
range

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 1.27.6 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2019-12468 is resolved across your whole dependency graph.

  3. Workarounds

    Put an independent control in front of the weakness: restrict the affected endpoint or interface to trusted networks, require an additional authentication factor or proxy-level check, and invalidate existing sessions and credentials in case the flaw has already been used.

Frequently Asked Questions

An Incorrect Access Control vulnerability was found in Wikimedia MediaWiki 1.27.0 through 1.32.1. Directly POSTing to Special:ChangeEmail would allow for bypassing re-authentication, allowing for potential account takeover.
O3 Security · Impact-Aware SCA

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CVE-2019-12468: core — Fixed in 1.27.6