What’s Vulnerable › Vulnerabilities

CVE-2023-45373

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-10-09 · updated 2026-06-17
• Weakness: CWE-79

Description

An issue was discovered in the ProofreadPage extension for MediaWiki before 1.35.12, 1.36.x through 1.39.x before 1.39.5, and 1.40.x before 1.40.1. XSS can occur via formatNumNoSeparators.

Affected products

• Wikimedia Foundation MediaWiki: before 1.35.12; from 1.36.0 before 1.39.5; 1.40.0 — fixed in 1.35.12, 1.39.5

How to fix

Upgrade to a fixed version: Wikimedia Foundation MediaWiki 1.35.12, 1.39.5. Check the vendor advisory for mitigations.

References

• https://gerrit.wikimedia.org/r/c/mediawiki/extensions/ProofreadPage/+/961262
• https://phabricator.wikimedia.org/T345693
• https://gerrit.wikimedia.org/r/c/mediawiki/extensions/ProofreadPage/+/961262
• https://phabricator.wikimedia.org/T345693

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