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MEDIUM severity

CVE-2018-0503 — core

MEDIUM

CVE-2018-0503 is a medium-severity (CVSS 4.3) Improper Privilege Management vulnerability in mediawiki/core. A fix is available for mediawiki/core — see the affected versions and patch details below.

Mediawiki Improper Privilege Management

Also known asGHSA-mhfv-9h99-jwg7
Published
Updated
Affected
4 pkgs
Patched
4 / 4
Exploits
None indexed
Exploitation data as of Nov 8, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.6%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs75th percentile — riskier than 75% of all scored CVEsHighest risk
0.00%0.69%1.37%2.06%0.4%1.6%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 contrary to the documentation, $wgRateLimits entry for 'user' overrides that for 'newbie'.

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

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 CVE-2018-0503 is resolved across your whole dependency graph.

  3. Workarounds

    Close the privilege gap rather than the entry point: audit which accounts, roles and service identities can reach the affected operation, drop the component to the least privilege it actually needs, and review file and directory permissions created by earlier installs — a default left in place is what makes this reachable.

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 contrary to the documentation, $wgRateLimits entry for 'user' overrides that for 'newbie'.
O3 Security · Impact-Aware SCA

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CVE-2018-0503: core — Fixed in 1.27.5