Medium severity5.4OSV Advisory· Published Jan 21, 2026· Updated Jun 17, 2026
CVE-2026-23630
CVE-2026-23630
Description
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.
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Affected products
3Patches
Vulnerability mechanics
References
3- github.com/docmost/docmost/commit/cb9f27da9a8b4940760e37e5238a1eb91e427dafnvdPatch
- github.com/docmost/docmost/security/advisories/GHSA-r4hj-mc62-jmwjnvdExploitVendor Advisory
- github.com/docmost/docmost/releases/tag/v0.24.0nvdProductRelease Notes
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