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CVE-2026-52853— Docmost: Privilege Escalation - ADMIN Can Invite Users as OWNER

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。在版本 0.90.1 之前，经过身份验证的工作区管理员（ADMIN）可以利用工作区邀请流程，以拥有者（OWNER）角色邀请外部邮箱地址，因为权限上限（role ceiling）机制未能阻止管理员授予高于自身权限的角色。当该邀请被接受后，新账户将获得拥有者（OWNER）级别的权限，从而使管理员能够创建具有后门性质的拥有者账户，或与串通的外部用户合作，将其提升至高权限的拥有者级别。该问题已在版本 0.90.1 中修复。

CVSS 5.2 · Medium EPSS 0.21% · P10

Affected Version Matrix 1

VendorProduct Version RangeStatus
docmost docmost < 0.90.1 affected
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I. Basic Information for CVE-2026-52853

Vulnerability Information
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Vulnerability Title
Docmost: Privilege Escalation - ADMIN Can Invite Users as OWNER
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 ADMIN can use the workspace invitation flow to invite an external email address with the OWNER role because the role ceiling does not prevent ADMIN users from granting privileges above their own. When the invitation is accepted, the new account receives OWNER-level permissions, allowing the ADMIN to create a backdoor OWNER account or promote a colluding external user to the workspace's highest privilege level. 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:H/UI:R/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
特权管理不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
docmost docmost < 0.90.1 -

II. Public POCs for CVE-2026-52853

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III. Intelligence Information for CVE-2026-52853

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Patches & Fixes for CVE-2026-52853 (1)

Vendor Advisories for CVE-2026-52853 (1)

Other References for CVE-2026-52853 (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-2026-52850 4.3 MEDIUM Docmost: Broken access control in transclusion lookup API leaks sync-block content across
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-269

V. Comments for CVE-2026-52853

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