XSS in Docmost
CVE-2026-34212
Docmost is open-source collaborative wiki and documentation software. In versions prior to 0.71.0, improper neutralization of attachment URLs in Docmost allows a low-privileged authenticated user to store a malicious `javascript:` URL inside an attachment node in page content. When another user views the page and activates the attachment link/icon, attacker-controlled JavaScript executes in the context of the Docmost origin. Version 0.71.0 patches the issue.
Vulnerability class: XSS (Cross-Site Scripting)
EPSS: 0.002 (11.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.
Affected products
- Docmost — versions < 0.71.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-34212?
- CVE-2026-34212 is a medium-severity vulnerability in Docmost, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-04-14.
- How severe is CVE-2026-34212?
- Medium severity. CVSS v3 base score is 5.4 out of 10.
- Is CVE-2026-34212 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.