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CVE-2026-34212— Docmost page content has stored XSS via unsanitized attachment URLs

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 0.71.0之前版本存在跨站脚本漏洞，该漏洞源于附件URL中和不当，可能导致低权限认证用户在页面内容中存储恶意javascript:URL并执行攻击者控制的JavaScript。

CVSS 5.4 · Medium EPSS 0.24% · P14
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I. Basic Information for CVE-2026-34212

Vulnerability Information
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Vulnerability Title
Docmost page content has stored XSS via unsanitized attachment URLs
Source: CVE Program / CVE List V5
Vulnerability Description
Docmost is open-source collaborative wiki and documentation software. In versions prior to 0.71.0, improper neutralization of attachment URLs in Docmost allows a low-privileged authenticated user to store a malicious `javascript:` URL inside an attachment node in page content. When another user views the page and activates the attachment link/icon, attacker-controlled JavaScript executes in the context of the Docmost origin. Version 0.71.0 patches the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Docmost 跨站脚本漏洞
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 0.71.0之前版本存在跨站脚本漏洞，该漏洞源于附件URL中和不当，可能导致低权限认证用户在页面内容中存储恶意javascript:URL并执行攻击者控制的JavaScript。
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 < 0.71.0 -

II. Public POCs for CVE-2026-34212

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III. Intelligence Information for CVE-2026-34212

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Vendor Advisories for CVE-2026-34212 (1)

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

CVE-2026-34213 5.4 MEDIUM Docmost has cross-page attachment overwrite via flawed attachmentId overwrite validation
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-79

V. Comments for CVE-2026-34212

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