CVE-2026-34213— Docmost has cross-page attachment overwrite via flawed attachmentId overwrite validation
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: NVD (National Vulnerability Database)
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
II. Public POCs 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
- CVE-2026-40927
Docmost: XSS in Comments with JavaScript URI - CVE-2026-34212
Docmost page content has stored XSS via unsanitized attachme - CVE-2026-33193
Docmost vulnerable to stored XSS via MIME type spoofing - CVE-2026-33146
Docmost's Public Share Search Exposes Metadata of Restricted - CVE-2026-24045
Docmost Affected by Stored XSS in Public Share Page
Same vendor: docmost
- CVE-2026-40927
Docmost: XSS in Comments with JavaScript URI - CVE-2026-34212
Docmost page content has stored XSS via unsanitized attachme - CVE-2026-33193
Docmost vulnerable to stored XSS via MIME type spoofing - CVE-2026-33146
Docmost's Public Share Search Exposes Metadata of Restricted - CVE-2026-24045
Docmost Affected by Stored XSS in Public Share Page
Same weakness: CWE-639
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V. Comments for CVE-2026-34213
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