Cross-Site Scripting Vulnerability in Legora by Legora
CVE-2026-74234

5.1MEDIUM

Key Information:

Vendor

Legora

Status
Legora
Vendor
CVE Published:
17 August 2026

What is CVE-2026-74234?

Legora, prior to the release on August 14, 2026, is vulnerable to a cross-site scripting issue that can lead to arbitrary JavaScript execution in a user's browser. This vulnerability arises when an attacker influences content using a Mermaid diagram that incorporates a gray-matter JavaScript directive. As a result, the front-matter parser may execute eval() without proper SVG sanitization, allowing malicious code to run. The consequences of this flaw are amplified on platforms like Word and Outlook add-ins where sensitive session tokens are stored in local storage, heightening the risk of unauthorized access.

Affected Version(s)

Legora 0

References

https://legora.com/
product
https://www.vulncheck.com/advisories/legora-2026-08-14-xs...
third-party-advisory

CVSS V4

Score:
5.1
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Mobasi Security Team
.