How severe is CVE-2026-23630?

CVE-2026-23630 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-23630 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (15th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-23630?

CVE-2026-23630 affects Docmost. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-23630?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-23630 have an EU (EUVD) identifier?

Yes. CVE-2026-23630 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-4211.

When was CVE-2026-23630 published?

CVE-2026-23630 was published on 2026-01-21 and last updated on 2026-06-17.

CVE-2026-23630

CVE-2026-23630 is a medium-severity vulnerability in Docmost with a CVSS 3.x base score of 5.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
CVSS v4: 6.3
EPSS exploit prediction: 0% (15th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-4211
Weakness: CWE-79
Affected product: Docmost
Published: 2026-01-21
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-23630?: 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.
How severe is CVE-2026-23630?: CVE-2026-23630 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-23630 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (15th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-23630?: CVE-2026-23630 affects Docmost. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-23630?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-23630 have an EU (EUVD) identifier?: Yes. CVE-2026-23630 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-4211.
When was CVE-2026-23630 published?: CVE-2026-23630 was published on 2026-01-21 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:docmost:docmost:*:*:*:*:*:*:*:*

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