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Vulnerability record · CVE-2026-23630 · published 21 January 2026

CVE-2026-23630: Docmost cross-site scripting vulnerability

Docmost · Docmost

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.

6.3 CVSS 4.0 Medium EPSS 0.28% · top 81.3% CWE-79 · Cross-site scriptingCWE-116 · CWE-116
6.3CVSS 4.0 base score
0.28%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References, 1 tagged exploit
17 Jun 2026Last modified by NVD

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.

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/docmost/docmost/commit/cb9f27da9a8b4940760e37e5238a1eb91e427daf Patch
https://github.com/docmost/docmost/releases/tag/v0.24.0 ProductRelease Notes
https://github.com/docmost/docmost/security/advisories/GHSA-r4hj-mc62-jmwj ExploitVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2026-22249Docmost path traversal vulnerabilityDocmost is an open-source collaborative wiki and documentation software. From 0.21.0 to before 0.24.0, Docmost is vulnerable to Arbitrary File Write …EPSS 0.57%6.1CVE-2025-55574Docmost cross-site scripting vulnerabilityCross Site Scripting vulnerability in docmost v.0.21.0 and before allows an attacker to execute arbitrary codeEPSS 0.28%5.4CVE-2026-40927Docmost cross-site scripting vulnerabilityDocmost is open-source collaborative wiki and documentation software. Prior to 0.80.0, when leaving a comment on a page, it is possible to include a …EPSS 0.23%5.4CVE-2026-34212Docmost cross-site scripting vulnerabilityDocmost is open-source collaborative wiki and documentation software. In versions prior to 0.71.0, improper neutralization of attachment URLs in Docm…EPSS 0.24%5.4CVE-2026-34213Docmost insecure direct object reference vulnerabilityDocmost is open-source collaborative wiki and documentation software. Starting in version 0.3.0 and prior to version 0.71.0, improper authorization i…EPSS 0.29%5.4CVE-2026-24045Docmost cross-site scripting vulnerabilityDocmost is open-source collaborative wiki and documentation software. From 0.20.0 and before 0.25.0, the public share page functionality in Docmost d…EPSS 0.23%4.6CVE-2026-33193Docmost cross-site scripting vulnerabilityDocmost is open-source collaborative wiki and documentation software. Versions prior to 0.70.0 are vulnerable to a stored cross-site scripting (XSS) …EPSS 0.23%4.3CVE-2026-33146Docmost improper authorization vulnerabilityDocmost is open-source collaborative wiki and documentation software. An authorization bypass vulnerability in versions 0.70.0 through 0.70.2 exposes…EPSS 0.31%

Source: NIST National Vulnerability Database (record CVE-2026-23630), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.