gitroomhq postiz-app up to 2.21.2 Endpoint /public/stream server-side request forgery

Summaryinfo

A vulnerability was found in gitroomhq postiz-app up to 2.21.2. It has been rated as critical. This issue affects some unknown processing of the file /public/stream of the component Endpoint. Performing a manipulation results in server-side request forgery. This vulnerability was named CVE-2026-34577. The attack may be initiated remotely. There is no available exploit. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as critical, was found in gitroomhq postiz-app up to 2.21.2. This affects an unknown function of the file /public/stream of the component Endpoint. The manipulation with an unknown input leads to a server-side request forgery vulnerability. CWE is classifying the issue as CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Postiz is an AI social media scheduling tool. Prior to version 2.21.3, the GET /public/stream endpoint in PublicController accepts a user-supplied url query parameter and proxies the full HTTP response back to the caller. The only validation is url.endsWith('mp4'), which is trivially bypassable by appending .mp4 as a query parameter value or URL fragment. The endpoint requires no authentication and has no SSRF protections, allowing an unauthenticated attacker to read responses from internal services, cloud metadata endpoints, and other network-internal resources. This issue has been patched in version 2.21.3.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-34577 since 03/30/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 2.21.3 eliminates this vulnerability.

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Productinfo

Vendor

• gitroomhq

Name

• postiz-app

Version

• 2.21.0
• 2.21.1
• 2.21.2

Website

• Product: https://github.com/gitroomhq/postiz-app/

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CPE 2.2info

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