What is the CVSS score of CVE-2026-23630?

CVE-2026-23630 has a CVSS 3.1 base score of 5.4 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N. EPSS exploitation probability: 0.0%.

Which versions of Docmost are affected by CVE-2026-23630?

Organizations using versions 0.3.0 should be aware of moderate risk from CVE-2026-23630, a cross-site scripting vulnerability rated CVSS 5.4.. A patch is available.

Is there a public PoC exploit available for CVE-2026-23630?

Yes, a public proof-of-concept exploit is available for CVE-2026-23630. Prioritise patching immediately. EPSS: 0.0%.

Docmost CVE-2026-23630

MEDIUM

Cross-site Scripting (XSS) (CWE-79)

2026-01-21 security-advisories@github.com

XSS Docmost

5.4

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

5.4 MEDIUM

AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:54 vuln.today

PoC Detected

Feb 17, 2026 - 16:50 vuln.today

Public exploit code

Patch released

Feb 17, 2026 - 16:50 nvd

Patch available

CVE Published

Jan 21, 2026 - 23:15 nvd

MEDIUM 5.4

DescriptionGitHub Advisory

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.

AnalysisAI

Stored XSS in Docmost 0.3.0-0.23.2 allows authenticated users to execute arbitrary JavaScript in the browsers of document viewers through malicious Mermaid diagram code blocks. The vulnerability exists because unsanitized SVG/HTML output from Mermaid rendering is directly injected into the DOM, and Mermaid's security controls can be disabled via diagram directives. …

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Vulnerability AssessmentAI

Risk Assessment	CVSS 5.4 (MEDIUM). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	An attacker could exploit this vulnerability to compromise the affected system.
Remediation	A vendor patch is available — apply it immediately. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 30 days: Identify affected systems running versions 0.3.0 and apply vendor patches as part of regular patch cycle. …

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CVE-2026-23630 vulnerability details – vuln.today

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