Overview
The cybersecurity community is facing a new threat in the form of a server-side request forgery (SSRF) vulnerability in Postiz, an AI social media scheduling tool. This vulnerability, identified as CVE-2025-53641, allows an attacker to inject arbitrary HTTP headers into the middleware pipeline of the frontend application. As a result, unauthorized outbound requests can be initiated from the server hosting the Postiz application. This security flaw poses a significant risk to any organization utilizing versions 1.45.1 to 1.62.3 of the Postiz tool and could potentially lead to system compromise or data leakage.
Vulnerability Summary
CVE ID: CVE-2025-53641
Severity: High (8.2 CVSS score)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage due to unauthorized outbound requests.
Affected Products
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Product | Affected Versions
Postiz AI Social Media Scheduling Tool | 1.45.1 to 1.62.3
How the Exploit Works
The exploit takes advantage of a flaw in the frontend application of Postiz which doesn’t properly sanitize the HTTP headers. With this vulnerability, a malicious actor can inject arbitrary HTTP headers into the middleware pipeline of the application. These headers can then be used to initiate unauthorized outbound requests from the server hosting the Postiz application, leading to a server-side request forgery (SSRF) condition.
Conceptual Example Code
A conceptual example of how an attacker might exploit this vulnerability is shown below:
POST /api/schedule/post HTTP/1.1
Host: target.example.com
Content-Type: application/json
X-Forwarded-For: [malicious IP]
{ "post_content": "This is a test post." }In this example, the attacker injects a malicious IP address into the ‘X-Forwarded-For’ HTTP header. The server, failing to sanitize this input, uses the malicious IP address for any further requests, potentially compromising the system or leading to data leakage.
Mitigation
The vulnerability is fixed in version 1.62.3 of the Postiz application. Users of affected versions are advised to apply the vendor patch immediately. As a temporary mitigation, users can implement a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) to detect and prevent exploit attempts. However, these are only temporary solutions and users are strongly encouraged to apply the vendor patch as soon as possible to fully remediate the vulnerability.