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.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
None
No data modification
Availability
Low
Partial disruption
CVSS Vector v3.1
Weakness Type (CWE)
References 3
https://github.com/gitroomhq/postiz-app/commit/30e8b777098157362769226d1b46d83a…
security-advisories@github.com
https://github.com/gitroomhq/postiz-app/releases/tag/v2.21.5
security-advisories@github.com
https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-34w8-5j2v-h6ww
security-advisories@github.com