Platform
nodejs
Component
postiz-app
Fixed in
2.21.6
CVE-2026-40168 describes a Server-Side Request Forgery (SSRF) vulnerability discovered in Postiz, an AI-powered social media scheduling tool. This flaw allows attackers to potentially access internal resources by manipulating HTTP redirects, bypassing initial URL validation. The vulnerability impacts versions 0.0.0 up to and including 2.21.5, and a patch is available in version 2.21.5.
The SSRF vulnerability in Postiz allows an attacker to craft a malicious URL that initially appears valid but redirects the server-side request to an internal resource. While Postiz attempts to validate the initial URL, it fails to re-validate the final destination after HTTP redirects. This means an attacker can potentially access sensitive data residing on internal servers, such as databases, configuration files, or even internal APIs. The blast radius extends to any internal services accessible via HTTP(S) from the Postiz server, potentially exposing sensitive information and enabling further reconnaissance or lateral movement within the network. This vulnerability shares similarities with other SSRF exploits where initial validation is bypassed through redirect chains.
CVE-2026-40168 was publicly disclosed on 2026-04-10. The EPSS score is pending evaluation. No public proof-of-concept exploits have been reported at the time of writing. The vulnerability is tracked by the NVD and CISA. Active exploitation is currently unconfirmed.
Exploit Status
EPSS
0.06% (17% percentile)
CISA SSVC
CVSS Vector
The primary mitigation for CVE-2026-40168 is to immediately upgrade Postiz to version 2.21.5 or later. If upgrading is not immediately feasible, implement temporary workarounds. A Web Application Firewall (WAF) can be configured to block requests containing suspicious redirects or to enforce stricter URL validation. Additionally, review and strengthen the application's URL validation logic to ensure that redirects are properly re-validated before processing requests. Consider implementing a whitelist of allowed domains to further restrict outbound connections. After upgrading, confirm the fix by attempting to trigger the SSRF vulnerability with a known malicious URL and verifying that the request is blocked or redirected appropriately.
Update to version 2.21.5 or higher to mitigate the SSRF vulnerability. This update re-validates the final destination URL after HTTP redirects, preventing the server from making requests to internal resources.
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CVE-2026-40168 is a HIGH severity SSRF vulnerability affecting Postiz versions 0.0.0 through 2.21.5, allowing attackers to access internal resources via HTTP redirects.
If you are running Postiz version 2.21.5 or earlier, you are potentially affected by this SSRF vulnerability. Immediate action is required.
Upgrade Postiz to version 2.21.5 or later. As a temporary workaround, implement WAF rules and strengthen URL validation.
Active exploitation is currently unconfirmed, but the vulnerability's potential impact warrants immediate mitigation.
Refer to the Postiz security advisory for detailed information and updates regarding CVE-2026-40168: [https://postiz.com/security/advisories](https://postiz.com/security/advisories)
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