What is CVE-2026-52850?

CVE-2026-52850 is a medium-severity vulnerability in Docmost, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 4.3/10. Published 2026-09-24.

How severe is CVE-2026-52850?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Auth bypass in Docmost

CVE-2026-52850

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.

Vulnerability class: IDOR (Insecure Direct Object Reference)

Published 2026-09-24 · last modified 2026-09-24.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Docmost — versions < 0.90.1

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-52850?: CVE-2026-52850 is a medium-severity vulnerability in Docmost, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 4.3/10. Published 2026-09-24.
How severe is CVE-2026-52850?: Medium severity. CVSS v3 base score is 4.3 out of 10.