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CVE-2026-100383

Stored i18n XSS in WikiLambda's VisualEditor integration

MEDIUM
4.8
CVSS Score
Published: September 25, 2026 at 09:05 PM UTC
Updated: September 28, 2026 at 04:38 PM UTC
1 product affected across 1 vendorWikiLambda

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Severity
MEDIUM4.8
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

Description

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation Mediawiki - WikiLambda Extension allows Cross-Site Scripting (XSS). This issue affects Mediawiki - WikiLambda Extension: 1.47.0-alpha. The issue has been remediated on the `master` branch.

Affected

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

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/T434967
Source: cverecord
https://gerrit.wikimedia.org/r/c/mediawiki/extensions/WikiLambda/+/1326391

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

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

CVSS

4.8MEDIUMwikimedia-foundation
Vector?

Quick Info

StatusAWAITING ANALYSIS
CWE
CWE-79

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