Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation Mediawiki -… (CVE-2026-100383)
A Cross-Site Scripting (XSS) vulnerability exists in the Wikimedia Foundation Mediawiki WikiLambda Extension version 1.47.0-alpha due to improper neutralization of input during web page generation. This vulnerability has been fixed in the master branch of the codebase. No known exploits are reported in the wild. The vulnerability is rated medium severity based on the available information.
AI Analysis
Technical Summary
The vulnerability identified as CVE-2026-100383 affects the Wikimedia Foundation Mediawiki WikiLambda Extension version 1.47.0-alpha. It is an improper neutralization of input during web page generation, leading to Cross-Site Scripting (XSS). The issue has been remediated in the master branch, indicating a fix is available but no specific patch version is stated. The CVSS vector indicates network attack vector, low complexity, and privileges required, with user interaction needed and low impact on confidentiality. No known active exploitation is reported.
Potential Impact
Successful exploitation could allow an attacker with high privileges and user interaction to execute malicious scripts in the context of the affected web application, potentially leading to limited confidentiality impact. However, no active exploitation in the wild has been reported.
Mitigation Recommendations
The vulnerability has been remediated in the master branch of the Mediawiki WikiLambda Extension. Users should update to the fixed version once it is officially released. Until then, monitor the official Wikimedia Foundation advisories for patch availability. No additional vendor advisory or patch links are provided, so check the Wikimedia Foundation's official channels for updates.
Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation Mediawiki -… (CVE-2026-100383)
Description
A Cross-Site Scripting (XSS) vulnerability exists in the Wikimedia Foundation Mediawiki WikiLambda Extension version 1.47.0-alpha due to improper neutralization of input during web page generation. This vulnerability has been fixed in the master branch of the codebase. No known exploits are reported in the wild. The vulnerability is rated medium severity based on the available information.
CVSS v4.0
Affected software
pkg:github/wikimedia/extensions/WikiLambdaRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability identified as CVE-2026-100383 affects the Wikimedia Foundation Mediawiki WikiLambda Extension version 1.47.0-alpha. It is an improper neutralization of input during web page generation, leading to Cross-Site Scripting (XSS). The issue has been remediated in the master branch, indicating a fix is available but no specific patch version is stated. The CVSS vector indicates network attack vector, low complexity, and privileges required, with user interaction needed and low impact on confidentiality. No known active exploitation is reported.
Potential Impact
Successful exploitation could allow an attacker with high privileges and user interaction to execute malicious scripts in the context of the affected web application, potentially leading to limited confidentiality impact. However, no active exploitation in the wild has been reported.
Mitigation Recommendations
The vulnerability has been remediated in the master branch of the Mediawiki WikiLambda Extension. Users should update to the fixed version once it is officially released. Until then, monitor the official Wikimedia Foundation advisories for patch availability. No additional vendor advisory or patch links are provided, so check the Wikimedia Foundation's official channels for updates.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-45r6-8hjm-wh6p
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-100383"]
- Database Specific Severity
- MODERATE
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6ab74f35f7a7c54106e138cc
Added to database: 09/26/2026, 04:51:01 UTC
Last enriched: 09/26/2026, 04:58:49 UTC
Last updated: 09/27/2026, 02:47:33 UTC
Views: 15
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