CVE-2026-40168— Postiz has Server-Side Request Forgery via Redirect Bypass in /api/public/stream
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I. Basic Information for CVE-2026-40168
Vulnerability Information
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Vulnerability Title
Postiz has Server-Side Request Forgery via Redirect Bypass in /api/public/stream
Source: NVD (National Vulnerability Database)
Vulnerability Description
Postiz is an AI social media scheduling tool. Prior to 2.21.5, the /api/public/stream endpoint is vulnerable to SSRF. Although the application validates the initially supplied URL and blocks direct private/internal hosts, it does not re-validate the final destination after HTTP redirects. As a result, an attacker can supply a public HTTPS URL that passes validation and then redirects the server-side request to an internal resource.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
服务端请求伪造(SSRF)
Source: NVD (National Vulnerability Database)
Vulnerability Title
Gitroom Postiz 代码问题漏洞
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 2.21.5之前版本存在代码问题漏洞，该漏洞源于/api/public/stream端点存在服务端请求伪造，应用程序在HTTP重定向后未重新验证最终目标，可能导致攻击者通过重定向访问内部资源。
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 | < 2.21.5 | - |
II. Public POCs for CVE-2026-40168
| # | POC Description | Source Link | Shenlong Link |
|---|
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- Release v2.21.5 · gitroomhq/postiz-app · GitHubx_refsource_MISC
- feat: security fixes · gitroomhq/postiz-app@30e8b77 · GitHubx_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2026-40168
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-2026-40487
Postiz Has Unrestricted File Upload via MIME Type Spoofing t - 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-2026-40487
Postiz Has Unrestricted File Upload via MIME Type Spoofing t - CVE-2026-34590
Postiz: SSRF via Webhook Creation Endpoint Missing URL Safet
Same weakness: CWE-918
- CVE-2026-8193
Akaunting Invoice PDF Rendering dompdf.php server-side reque - CVE-2026-44313
LinkWarden: Server-Side Request Forgery (SSRF) in Link Creat - CVE-2026-42352
pygeoapi 0.23.x: Unauthenticated SSRF via OGC API - Processe - CVE-2026-42346
Postiz: TOCTOU DNS rebinding bypasses all SSRF URL validatio - CVE-2026-42339
New API: SSRF Filter Bypass via 0.0.0.0
V. Comments for CVE-2026-40168
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