Track vulnerabilities like this one. Sign up free to get alerted when software you use is affected.

CVE-2026-52850: Docmost lets non‑members view private synced content

CVE-2026-52850 · published 1 month ago

Summary

In Docmost versions before 0.90.1, a user who belongs to a workspace but not to a specific private space could request a special API and see text and details from that private space. This bypasses the normal page protections and could expose confidential information. Upgrade to version 0.90.1 or later to close the gap.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software

Vendor	Product	Affected versions
docmost	docmost	< 0.90.1

Original advisory text

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

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.

References

https://github.com/docmost/docmost/releases/tag/v0.90.1 URL
https://github.com/docmost/docmost/security/advisories/GHSA-5vhf-cgf2-c9cq Vendor Advisory
https://github.com/docmost/docmost/commit/830b5b4d458a1302f42c8b68bff9ff559f6eb3... Patch
https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52850... Vendor Advisory
https://nvd.nist.gov/vuln/detail/CVE-2026-52850 Vendor Advisory

Fix within

Internet-facing 60 days

Internal At next upgrade

Not known to be exploited
Needs hands-on effort to exploit
Gives an attacker partial control

Severity

4.3 Medium

Exploitation

<1% chance of attack within 30 days

Type

CWE-639Authorization Bypass Through User-Controlled Key

CWE-862Missing Authorization

Timeline

Published24 Sep 2026

Updated29 Oct 2026

First seen24 Sep 2026

Sources

CVE-2026-52850 · NVD

CVE-2026-52850 · MITRE

CVE-2026-52850 · OSV

GHSA-5vhf-cgf2-c9cq · GHSA

Track software like this

Free during beta