CVE-2026-23630

MediumCVSS 5.4/10Last modified Jun 17, 2026

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.

Metrics

CVSS 3.1 5.4/10CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Weakness enumeration

CWE-79 CWE-116

Affected software

Vendor	Product	Versions
docmost	docmost	>= 0.3.0, < 0.24.0

References

https://github.com/docmost/docmost/commit/cb9f27da9a8b4940760e37e5238a1eb91e427dafPatch
https://github.com/docmost/docmost/releases/tag/v0.24.0Product, Release Notes
https://github.com/docmost/docmost/security/advisories/GHSA-r4hj-mc62-jmwjExploit, Vendor Advisory

Timeline

Published: Jan 21, 2026
Last modified: Jun 17, 2026
NVD status: Analyzed

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