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CVE-2026-34213— Docmost has cross-page attachment overwrite via flawed attachmentId overwrite validation

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Docmost开源的一个开协作维基和文档软件。 Docmost 0.3.0至0.71.0之前版本存在安全漏洞，该漏洞源于授权不当，可能导致低权限认证用户通过提供受害者attachmentId来覆盖同一工作空间中其他页面的附件。

CVSS 5.4 · Medium EPSS 0.29% · P19
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I. Basic Information for CVE-2026-34213

Vulnerability Information
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Vulnerability Title
Docmost has cross-page attachment overwrite via flawed attachmentId overwrite validation
Source: CVE Program / CVE List V5
Vulnerability Description
Docmost is open-source collaborative wiki and documentation software. Starting in version 0.3.0 and prior to version 0.71.0, improper authorization in Docmost allows a low-privileged authenticated user to overwrite another page's attachment within the same workspace by supplying a victim `attachmentId` to `POST /api/files/upload`. This is a remote integrity issue requiring no victim interaction. Version 0.71.0 contains a patch.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
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
Vulnerability Title
Docmost 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Docmost是Docmost开源的一个开协作维基和文档软件。 Docmost 0.3.0至0.71.0之前版本存在安全漏洞，该漏洞源于授权不当，可能导致低权限认证用户通过提供受害者attachmentId来覆盖同一工作空间中其他页面的附件。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
docmost docmost >= 0.3.0, < 0.71.0 -

II. Public POCs for CVE-2026-34213

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III. Intelligence Information for CVE-2026-34213

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Same Patch Batch · docmost · 2026-04-14 · 4 CVEs total

CVE-2026-34212 5.4 MEDIUM Docmost page content has stored XSS via unsanitized attachment URLs
CVE-2026-33193 4.6 MEDIUM Docmost vulnerable to stored XSS via MIME type spoofing
CVE-2026-33146 4.3 MEDIUM Docmost's Public Share Search Exposes Metadata of Restricted Children

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-34213

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