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MEDIUM severity

Mediawiki BotPassword can bypass CentralAuth's account lockGHSA-5c6w-f4w2-2grp

MEDIUM

GHSA-5c6w-f4w2-2grp is a medium-severity (CVSS 6.5) Improper Authentication 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.

Also known asCVE-2018-0505
Published
Updated
Affected
4 pkgs
Patched
4 / 4
Exploits
1 known
Exploitation data as of Nov 5, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
2.0%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs80th percentile — riskier than 80% of all scored CVEsHighest risk
0.00%0.82%1.65%2.47%0.4%2.0%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

Mediawiki 1.31 before 1.31.1, 1.30.1, 1.29.3 and 1.27.5 contains a flaw where BotPasswords can bypass CentralAuth's account lock

Affected Packages

4 total 4 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistmediawiki/core≥ 1.27.0&&< 1.27.51.27.5composer require mediawiki/core:^1.27.5
🐘Packagistmediawiki/core≥ 1.29.0&&< 1.29.31.29.3composer require mediawiki/core:^1.29.3
🐘Packagistmediawiki/core≥ 1.30.0&&< 1.30.11.30.1composer require mediawiki/core:^1.30.1
🐘Packagistmediawiki/core≥ 1.31.0&&< 1.31.11.31.1composer require mediawiki/core:^1.31.1

Affected Products

2 products · 5 configurations
OS
debian linuxdebian
1 version
9.0
Application
mediawikimediawiki
≥ 1.31.0 && < 1.31.1
3 versions
1.27.51.29.31.30.1
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.

Mediawiki 1.31 before 1.31.1, 1.30.1, 1.29.3 and 1.27.5 contains a flaw …

phabricator.wikimedia.orgNVDOct 2019

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 1.27.5 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-5c6w-f4w2-2grp 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.

Fixing This On Your OS

If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.

Red HatLow
ProductFixed inAdvisory
Red Hat OpenShift Container Platform 3.10mediawiki-0:1.27.7-1.el7RHSA-2019:3238
Red Hat OpenShift Container Platform 3.11mediawiki-0:1.27.7-1.el7RHSA-2019:3142
Red Hat OpenShift Container Platform 3.9mediawiki123-0:1.23.17-1.el7RHSA-2019:3813

Frequently Asked Questions

Mediawiki 1.31 before 1.31.1, 1.30.1, 1.29.3 and 1.27.5 contains a flaw where BotPasswords can bypass CentralAuth's account lock
O3 Security · Impact-Aware SCA

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Mediawiki BotPassword can bypass CentralAuth's…