Is this vulnerability remotely exploitable over the internet?

Yes. As long as the `/public/stream` endpoint is exposed, an unauthenticated attacker on the internet can send crafted requests and cause the server to fetch internal or external URLs on their behalf.

Does exploitation require authentication or a valid user account?

No. The vulnerable endpoint does not enforce authentication, so any party with network access to the Postiz HTTP interface can attempt exploitation.

What is the safest general fix pattern for this class of bug?

The most robust fix pattern is to eliminate arbitrary user-controlled proxying: replace open URL fetching with allow-listed, application-defined destinations, coupled with strict URL parsing and network egress controls that block access to internal and metadata endpoints.

Severity:

HIGH RISK

(8.6)

Server-Side Request Forgery (CWE-918) in Postiz Public Stream Proxy Endpoint

CVE-2026-34577

Published:

Apr 2, 2026

Status:

Undergoing Analysis

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

Remote Code Execution on the Router

April 6, 2026

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Remote Code Execution on Router Firmware

April 6, 2026

Vulnerability Type

Category:

Server-Side Request Forgery (SSRF)

CWE:

CWE-918

Impact:

Exposure of internal services and metadata via server-initiated HTTP requests

Severity:

HIGH RISK

(8.6)

CVSS Version:

3.1

Vulnerability Type

Category:

Server-Side Request Forgery (SSRF)

CWE:

CWE-918

Impact:

Exposure of internal services and metadata via server-initiated HTTP requests

Severity:

HIGH RISK

(8.6)

CVSS Version:

3.1

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Ask AI for summary of CodeAnt

Server-Side Request Forgery (CWE-918) in Postiz Public Stream Proxy Endpoint

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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