Medium 4.3Published Sep 24, 2026

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

Updated under an hour ago (2026-10-19 07:50 UTC)

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No exploitation reported and no EPSS estimate yet.

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Every CVE for docmost

Exploited in the last 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.

CVSS: 4.3 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Weakness (CWE): CWE-639, CWE-862
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Sep 29, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

docmost docmost docmost:docmost (from the name)	before 0.90.1	CNA record

References

https://github.com/docmost/docmost/security/advisories/GHSA-5vhf-cgf2-c9cqx-refsource-confirm
https://github.com/docmost/docmost/commit/830b5b4d458a1302f42c8b68bff9ff559f6eb342x-refsource-misc
https://github.com/docmost/docmost/releases/tag/v0.90.1x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.