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CVE-2026-39838

ProofreadPage improperly sanitizes multiline styles using Sanitizer::checkCSS

MEDIUM
6.9
CVSS Score
Published: April 7, 2026 at 07:17 PM UTC
Updated: July 21, 2026 at 07:26 PM UTC
1 product affected across 1 vendorProofreadPage

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Severity
MEDIUM6.9
Exploit prediction
EPSS 0.4%
SSVC
PoC

Description

Improper neutralization of input during web page generation ('cross-site scripting') vulnerability in Wikimedia Foundation MediaWiki - ProofreadPage Extension allows XSS Targeting Non-Script Elements.This issue affects .

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

ProofreadPage· Wikimedia
60%
v < 1.43
Vendor states this is fixed in 1.43 (unaffected)
Vendor states this is fixed in 1.44 (unaffected)
Vendor states this is fixed in 1.45 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (2)

Source: cverecord
https://phabricator.wikimedia.org/T406088
Source: cverecord
https://gerrit.wikimedia.org/r/q/Idd51e18479b32b7176b43ff74ca1c49d6bdd0628

SSVC — Action Prioritization

SSVCPoCNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.9MEDIUMwikimedia-foundation
Vector?

Quick Info

StatusAWAITING ANALYSIS
CWE
CWE-79

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