CVE-2026-40487— Postiz Has Unrestricted File Upload via MIME Type Spoofing that Leads to Stored XSS
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I. Basic Information for CVE-2026-40487
Vulnerability Information
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Vulnerability Title
Postiz Has Unrestricted File Upload via MIME Type Spoofing that Leads to Stored XSS
Source: NVD (National Vulnerability Database)
Vulnerability Description
Postiz is an AI social media scheduling tool. Prior to version 2.21.6, a file upload validation bypass allows any authenticated user to upload arbitrary HTML, SVG, or other executable file types to the server by spoofing the `Content-Type` header. The uploaded files are then served by nginx with a Content-Type derived from their original extension (`text/html`, `image/svg+xml`), enabling Stored Cross-Site Scripting (XSS) in the context of the application's origin. This can lead to session riding, account takeover, and full compromise of other users' accounts. Version 2.21.6 contains a fix.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:L
Source: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
Vulnerability Title
Gitroom Postiz 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Gitroom Postiz是Gitroom开源的一个社交媒体日程安排工具。 Gitroom Postiz 2.21.6之前版本存在安全漏洞，该漏洞源于文件上传验证绕过，可能导致存储型跨站脚本攻击、会话劫持和账户接管。
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 |
|---|---|---|---|---|
| gitroomhq | postiz-app | < 2.21.6 | - |
II. Public POCs for CVE-2026-40487
| # | POC Description | Source Link | Shenlong Link |
|---|
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IV. Related Vulnerabilities
Same product: postiz-app
- CVE-2026-42556
Postiz stored XSS in public preview page - CVE-2026-42346
Postiz: TOCTOU DNS rebinding bypasses all SSRF URL validatio - CVE-2026-42298
Postiz: Arbitrary Code Execution and Token Exfiltration in p - CVE-2026-40168
Postiz has Server-Side Request Forgery via Redirect Bypass i - CVE-2026-34590
Postiz: SSRF via Webhook Creation Endpoint Missing URL Safet
Same vendor: gitroomhq
- CVE-2026-42556
Postiz stored XSS in public preview page - CVE-2026-42346
Postiz: TOCTOU DNS rebinding bypasses all SSRF URL validatio - CVE-2026-42298
Postiz: Arbitrary Code Execution and Token Exfiltration in p - CVE-2026-40168
Postiz has Server-Side Request Forgery via Redirect Bypass i - CVE-2026-34590
Postiz: SSRF via Webhook Creation Endpoint Missing URL Safet
Same weakness: CWE-79
- CVE-2026-8262
Devs Palace ERP Online chart-save cross site scripting - CVE-2026-8256
Devs Palace ERP Online mr-save cross site scripting - CVE-2026-8255
Devs Palace ERP Online add_new_customer cross site scripting - CVE-2026-8254
Devs Palace ERP Online sales_save cross site scripting - CVE-2026-8253
Devs Palace ERP Online purchase_save cross site scripting
V. Comments for CVE-2026-40487
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