What’s Vulnerable › Vulnerabilities

CVE-2026-52850: Docmost: Broken access control in transclusion lookup API leaks sync-block content across private spaces

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-24 · updated 2026-09-29
• Weakness: CWE-639

Description

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: before 0.90.1

References

• https://github.com/docmost/docmost/commit/830b5b4d458a1302f42c8b68bff9ff559f6eb342
• https://github.com/docmost/docmost/releases/tag/v0.90.1
• https://github.com/docmost/docmost/security/advisories/GHSA-5vhf-cgf2-c9cq

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