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CVE-2026-68899— Wekan: File Upload MIME Type Validation Bypass — Stored XSS via Missing System Binary Fallback

Quick assessment

Affected
wekan wekan
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WeKan是WeKan团队的一款项目管理软件。 WeKan 9.90之前版本存在任意文件上传漏洞，该漏洞源于文件验证逻辑中MIME类型检测失效，当Unix file命令不可用时回退到攻击者控制的fileObj.type，导致包含JavaScript的HTML可被标记为image/png上传并绕过检查，可能导致其他用户打开时执行恶意脚本。

CVSS 8.7 · High EPSS 0.40% · P34

Affected Version Matrix 1

VendorProduct Version RangeStatus
wekan wekan < 9.90 affected
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I. Basic Information for CVE-2026-68899

Vulnerability Information
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Vulnerability Title
Wekan: File Upload MIME Type Validation Bypass — Stored XSS via Missing System Binary Fallback
Source: CVE Program / CVE List V5
Vulnerability Description
Wekan is open source kanban built with Meteor. Prior to 9.90, isFileValid() in models/fileValidation.js used the Unix file command for content-based MIME detection, but detectMimeFromFile() silently returned undefined when that binary was unavailable and the validation fell back to the attacker-controlled fileObj.type supplied through server/routes/attachmentApi.js. On deployments with WITH_API=true and no file binary, an authenticated board member could label HTML containing JavaScript as image/png, bypass the dangerous MIME check, and store active content under the Wekan origin for execution when another user opened it. Version 9.90 adds looksLikeDangerousMarkup() to inspect file bytes and force dangerous-content scanning when MIME detection is unavailable. This issue is fixed in version 9.90.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
危险类型文件的不加限制上传
Source: CVE Program / CVE List V5
Vulnerability Title
WeKan 任意文件上传漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WeKan是WeKan团队的一款项目管理软件。 WeKan 9.90之前版本存在任意文件上传漏洞，该漏洞源于文件验证逻辑中MIME类型检测失效，当Unix file命令不可用时回退到攻击者控制的fileObj.type，导致包含JavaScript的HTML可被标记为image/png上传并绕过检查，可能导致其他用户打开时执行恶意脚本。
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
wekan wekan < 9.90 -

II. Public POCs for CVE-2026-68899

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 10736 chars
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III. Intelligence Information for CVE-2026-68899

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Patches & Fixes for CVE-2026-68899 (1)

Vendor Advisories for CVE-2026-68899 (1)

Vendor Pages for CVE-2026-68899 (1)

Same Patch Batch · wekan · 2026-08-19 · 7 CVEs total

CVE-2026-68561 8.8 HIGH Wekan: a low-privilege board member escalates to board admin and takes over a private boar
CVE-2026-68558 8.5 HIGH Wekan: SSRF filter bypass via DNS-resolving hostname in outgoing webhooks (incomplete fix
CVE-2026-68560 7.7 HIGH Wekan:hell Injection in External Antivirus Scanner Path via asyncExec
CVE-2026-68900 7.6 HIGH Wekan: Stored XSS in HTML board exports through a card-title second parse
CVE-2026-68901 6.5 MEDIUM WeKan Board Export REST Endpoints: NULL Pointer Dereference on Invalid authToken Leads to
CVE-2026-68559 6.5 MEDIUM Wekan: Broken access control in the Excel-export route (`/api/boards/:boardId/exportExcel`

IV. Related Vulnerabilities

Same product: wekan
Same vendor: wekan
Same weakness: CWE-434

V. Comments for CVE-2026-68899

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