What’s Vulnerable › Vulnerabilities

CVE-2026-40168: Postiz has Server-Side Request Forgery via Redirect Bypass in /api/public/stream

• Severity: high (CVSS 8.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-04-10 · updated 2026-10-26
• Weakness: CWE-918

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.

Affected products

• gitroomhq postiz-app: before 2.21.5 — fixed in 2.21.5

How to fix

Upgrade to a fixed version: gitroomhq postiz-app 2.21.5. Check the vendor advisory for mitigations.

References

• https://github.com/gitroomhq/postiz-app/commit/30e8b777098157362769226d1b46d83ad616cb06
• https://github.com/gitroomhq/postiz-app/releases/tag/v2.21.5
• https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-34w8-5j2v-h6ww
• https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-34w8-5j2v-h6ww

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