CVE-2026-39838
MediumCVSS 6.9Exploitation Probability (EPSS)
Low risk33th percentile - higher than 33% of all known CVEs
Summary
The ProofreadPage extension for MediaWiki is vulnerable to Cross-Site Scripting (XSS) targeting non-script elements. The issue is fixed in the master branch and in MediaWiki versions 1.43, 1.44, and 1.45.
Risk Assessment
An attacker can inject malicious HTML/JavaScript that executes in the victim's browser, leading to session theft or content manipulation.
Recommendation
Update MediaWiki to version 1.43, 1.44, or 1.45, which include the fix for the ProofreadPage extension.
Related vulnerabilities
- CVE-2026-93945Critical
Deserialization of Untrusted Data vulnerability in the Balance theme by Axiomthemes allows Object Injection. This issue affects Balance from n/a through 1.12.0.
- CVE-2026-93944Critical
Deserialization of Untrusted Data vulnerability in the Camelia theme by ThemeREX Group allows Object Injection. This issue affects Camelia from n/a through 1.2.15.
- CVE-2026-93943Critical
Deserialization of Untrusted Data vulnerability in the Convex theme by ThemeREX Group allows Object Injection. This issue affects Convex from n/a through 1.16.0.
- CVE-2026-93942Critical
Deserialization of Untrusted Data vulnerability in the Dwell theme by ThemeREX Group allows Object Injection. This issue affects Dwell from n/a through 1.16.0.
- CVE-2026-93941Critical
Deserialization of Untrusted Data vulnerability in the Edema theme by ThemeREX Group allows Object Injection. This issue affects Edema from n/a through 1.2.2.2.
- CVE-2026-93940Critical
Deserialization of Untrusted Data vulnerability in the Greeny theme by ThemeREX Group allows Object Injection. This issue affects Greeny from n/a through 2.10.0.
- CVE-2026-93938Critical
Deserialization of Untrusted Data vulnerability in the Hogwords theme by ThemeREX Group allows Object Injection. This issue affects Hogwords from n/a through 1.2.7.
- CVE-2026-93937Critical
Deserialization of Untrusted Data vulnerability in the Hygia theme by ThemeREX Group allows Object Injection. This issue affects Hygia from n/a through 1.21.0.
- CVE-2026-93936Critical
Deserialization of Untrusted Data vulnerability in the IPharm theme by ThemeREX Group allows Object Injection. This issue affects IPharm from n/a through 1.2.4.
- CVE-2026-93935Critical
Deserialization of Untrusted Data vulnerability in the Let's Play theme by ThemeREX Group allows Object Injection. This issue affects Let's Play from n/a through 1.1.15.
Original NVD description (English source)
Improper neutralization of input during web page generation ('cross-site scripting') vulnerability in Wikimedia Foundation MediaWiki - ProofreadPage Extension allows XSS Targeting Non-Script Elements. The issue has been remediated on the `master` branch, and in the release branches for MediaWiki versions 1.43, 1.44, and 1.45.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS