---
id: CVE-2026-52850
title: Docmost is open-source collaborative wiki and documentation software
summary: >-
  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 a…
severity: medium
cvss: 4.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N'
cwe:
  - CWE-639
  - CWE-862
vendor: docmost
product: docmost
affected:
  - docmost < 0.90.1
published: '2026-09-24'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T19:17:14.060'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-52850'
references:
  - url: >-
      https://github.com/docmost/docmost/commit/830b5b4d458a1302f42c8b68bff9ff559f6eb342
    label: security-advisories@github.com
  - url: 'https://github.com/docmost/docmost/releases/tag/v0.90.1'
    label: security-advisories@github.com
  - url: 'https://github.com/docmost/docmost/security/advisories/GHSA-5vhf-cgf2-c9cq'
    label: security-advisories@github.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-24T18:49:36.720Z'
epss: 0.00193
epssPercentile: 0.07961
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.