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

Quick assessment

Affected
docmost docmost
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Docmost 是一款开源的协作式维基和文档软件。在 0.90.1 版本之前，一个不属于私有工作区的经过身份认证的工作区成员，可以通过提供已知的 sourcePageId 和 transclusionId 配对，调用 transclusion / sync-block 查找 API。这是因为在解析源页面之前，该查找操作未强制验证私有工作区的成员身份。因此，尽管普通页面 API 会拒绝访问同一页面，该 API 仍可能返回敏感的 sync-block 内容和源页面的元数据。此问题已在 0.90.1 版本中修复。

CVSS 4.3 · Medium EPSS 0.19% · P8

Possible ATT&CK Techniques 1 AI

T1005 · Data from Local System

Affected Version Matrix 1

VendorProduct Version RangeStatus
docmost docmost < 0.90.1 affected
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I. Basic Information for CVE-2026-52850

Vulnerability Information
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Vulnerability Title
Docmost: Broken access control in transclusion lookup API leaks sync-block content across private spaces
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
docmost docmost < 0.90.1 -

II. Public POCs for CVE-2026-52850

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III. Intelligence Information for CVE-2026-52850

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Patches & Fixes for CVE-2026-52850 (1)

Vendor Advisories for CVE-2026-52850 (1)

Other References for CVE-2026-52850 (1)

Same Patch Batch · docmost · 2026-09-24 · 6 CVEs total

CVE-2026-48070 7.1 HIGH Docmost: Avatar URL path traversal in avatar cleanup leads to arbitrary local file deletio
CVE-2026-65827 6.5 MEDIUM Docmost: Unbounded ZIP decompression (zip-bomb) in page import allows denial of service
CVE-2026-48072 5.3 MEDIUM Docmost: Public image fileName path traversal leads to unauthorized local file read
CVE-2026-52853 5.2 MEDIUM Docmost: Privilege Escalation - ADMIN Can Invite Users as OWNER
CVE-2026-48073 4.3 MEDIUM Docmost: Page export can include restricted same-space attachments through forged attachme

IV. Related Vulnerabilities

Same product: docmost
Same vendor: docmost
Same weakness: CWE-639

V. Comments for CVE-2026-52850

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