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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.

PUBLISHED Reserved 2025-02-20 | Published 2025-04-23 | Updated 2025-04-23 | Assigner zdi




HIGH: 7.1CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

Problem types

CWE-918: Server-Side Request Forgery (SSRF)

Product status

Default status
unknown

b8817c14065c23159dcf52849f0bdcd12516c43e
affected

References

www.zerodayinitiative.com/advisories/ZDI-25-096/ (ZDI-25-096)

github.com/...ommit/6e8f035f9acd339c5ba87ba6ea40fc1ab3053d42 (vendor-provided URL) vendor-advisory

cve.org (CVE-2025-1521)

nvd.nist.gov (CVE-2025-1521)

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