CVE-2026-23630: Docmost

Medium severity, CVSS 5.4. EPSS: 0.3% chance of exploitation in the next 30 days.

Docmost is open-source collaborative wiki and documentation software. In versions 0.3.0 through 0.23.2, Mermaid code block rendering is vulnerable to stored Cross-Site Scripting (XSS). The frontend can render attacker-controlled Mermaid diagrams using mermaid.render(), then inject the returned SVG/HTML into the DOM via dangerouslySetInnerHTML without sanitization. Mermaid per-diagram %%{init}%% directives allow overriding securityLevel and enabling htmlLabels, permitting arbitrary HTML/JS execution for any viewer. This issue has been fixed in version 0.24.0.

Affected products

• Docmost Docmost: from 0.3.0, before 0.24.0 (fixed in 0.24.0)

Published 2026-01-21. Last modified 2026-06-17.