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Vulnerabilities CVE-2026-74234

CVE-2026-74234

Medium
Open
TLP:CLEAR

Legora < 2026-08-14 XSS via Mermaid gray-matter JavaScript Engine

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Description

Legora before 2026-08-14 contains a cross-site scripting vulnerability that allows attackers to achieve arbitrary JavaScript execution in a victim's browser by embedding a Mermaid block prefixed with a gray-matter JavaScript front-matter directive, causing the front-matter parser to invoke eval() before any SVG sanitization occurs. Attackers can exploit this flaw through influenced Mermaid diagram content to execute arbitrary JavaScript in the user's browser context, with elevated impact on Word and Outlook add-in surfaces where bearer session tokens are persisted in localStorage.

Details

CVSS Score
5.1
CVSS Vector
CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N
Confidence
90%
Published
Aug 17, 2026
Last Modified
Aug 17, 2026
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