Vulnerability Description
PostHog slack_incoming_webhook Server-Side Request Forgery Information Disclosure Vulnerability. This vulnerability allows remote attackers to disclose sensitive information on affected installations of PostHog. Authentication is required to exploit this vulnerability. The specific flaw exists within the processing of the slack_incoming_webhook parameter. The issue results from the lack of proper validation of a URI prior to accessing resources. An attacker can leverage this vulnerability to execute code in the context of the service account. Was ZDI-CAN-25352.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Posthog | Posthog | < 0.3.7 |
Related Weaknesses (CWE)
References
- https://github.com/PostHog/posthog/commit/6e8f035f9acd339c5ba87ba6ea40fc1ab3053dPatch
- https://www.zerodayinitiative.com/advisories/ZDI-25-096/Third Party Advisory
FAQ
What is CVE-2025-1521?
CVE-2025-1521 is a vulnerability with a CVSS score of 6.5 (MEDIUM). PostHog slack_incoming_webhook Server-Side Request Forgery Information Disclosure Vulnerability. This vulnerability allows remote attackers to disclose sensitive information on affected installations ...
How severe is CVE-2025-1521?
CVE-2025-1521 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-1521?
Check the references section above for vendor advisories and patch information. Affected products include: Posthog Posthog.