Is this vulnerability remotely exploitable over the internet?

Yes, in typical deployments an attacker who has valid API credentials and network access to the Postiz API can exploit this issue remotely by invoking the affected endpoint with crafted URLs.

Does an attacker need elevated privileges to exploit it?

The attacker must be an authenticated API user with access to the `upload-from-url` functionality, but does not need administrative privileges if the endpoint is accessible to regular authenticated users.

What is the safest general fix pattern for this kind of issue?

Restrict where the server can connect by enforcing strict allow-lists for outbound requests, blocking access to private and metadata IP ranges, and validating URLs with robust parsing rather than relying on superficial checks like file extensions.

Severity:

HIGH RISK

(7.7)

Server-Side Request Forgery (CWE-918) in Postiz URL Upload Endpoint

CVE-2026-34576

Published:

Apr 2, 2026

Status:

Analyzed

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

CRITICAL RISK

CRITICAL

(9.8)

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

Remote Code Execution on the Router

April 12, 2026

CWE-77;CWE-78

CRITICAL RISK

CRITICAL

(9.8)

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

Remote Code Execution on the Router

April 12, 2026

Vulnerability Type

Category:

Server-Side Request Forgery (SSRF)

CWE:

CWE-918

Impact:

Unauthorized access to internal network resources and sensitive metadata via server-side requests

Severity:

HIGH RISK

(7.7)

CVSS Version:

3.1

Vulnerability Type

Category:

Server-Side Request Forgery (SSRF)

CWE:

CWE-918

Impact:

Unauthorized access to internal network resources and sensitive metadata via server-side requests

Severity:

HIGH RISK

(7.7)

CVSS Version:

3.1

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Ask AI for summary of CodeAnt

Server-Side Request Forgery (CWE-918) in Postiz URL Upload 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

CRITICAL RISK

CRITICAL

(9.8)

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

CRITICAL RISK

CRITICAL

(9.8)

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

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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