CVE-2026-52850: Docmost

Medium severity, CVSS 4.3. EPSS: 0.2% chance of exploitation in the next 30 days.

Docmost is open-source collaborative wiki and documentation software. Prior to 0.90.1, an authenticated workspace member who does not belong to a private space can call the transclusion / sync-block lookup API with a known sourcePageId and transclusionId pair because the lookup does not enforce private space membership before resolving the source page. The API can return confidential sync-block content and source page metadata even though the normal page APIs deny access to the same page. This issue is fixed in version 0.90.1.

Affected products

• Docmost Docmost: before 0.90.1 (fixed in 0.90.1)

Published 2026-09-24. Last modified 2026-09-29.