Docmost: XSS in Comments with JavaScript URI

published 2026-04-21 6 mo ago modified 2026-06-17 4 mo ago also EUVD-2026-24487

cvss: 5.4; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.1%; EPSS 0.1% chance of exploitation in 30 days, percentile 3%
public exploits: 0; none known

Docmost 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 JavaScript URI as the link. When a user clicks on the link the JavaScript executes. This vulnerability is fixed in 0.80.0.

Patch / fix

fixed in 1

docmost docmost 0.80.0

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 6 mo ago (2026-04-22)

Exploit prediction

0.14% chance of exploitation in the next 30 days, higher than 3% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	5.4	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Affected products

docmost docmost

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation

References

github.com /docmost/docmost/security/advisories/GHSA-4gv6-jw3v-wc34
vendor-advisory

Sources

CVE List CVE-2026-40927
NVD CVE-2026-40927

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary