CVE-2026-103584
attacker-controlled javascript license URL via XSS
- Published
- Sep 30, 2026
- Updated
- Oct 1, 2026
- Assigning CNA
- wikimedia-foundation
- Evidence observed
- Oct 3, 2026
Primary CVSS
nvd · CVSS 4.0
CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:P/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:N/AU:Y/R:U/V:C/RE:M/U:AmberLow · next 30 days
- Percentile
- 20.8%
- Model date
- Oct 25, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
Improper neutralization of Script-Related HTML tags in a web page (basic XSS) vulnerability in The Wikimedia Foundation MediaWiki CommonsMetadata extension allows Cross-Site Scripting (XSS). This issue affects MediaWiki CommonsMetadata extension: 1.46, 1.45, and 1.43.
Sources
Sanitized report and loopback-only PoC script for CVE-2026-103584, a javascript: URL scheme XSS in MediaWiki CommonsMetadata LicenseUrl rendering.
Sanitized report and loopback-only PoC script demonstrating stored XSS via javascript: license URLs in MediaSearch QuickView (CVE-2026-103585).
Responsible use
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