CVE-2025-1521CWE-918

PostHog slack_incoming_webhook Server-Side Request Forgery Information Disclosure Vulnerability

High · published April 23, 2025

CVSS v3.0
7.1
EPSS
1%
Percentile
51.3
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.0
7.1 · HIGH
Vector
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00667 · 51.3th percentile
Weakness
CWE-918 · Server-Side Request Forgery (SSRF)
Published
2025-04-23T16:45Z
EPSS history
Timeline
  • 23 APR 16:45Z
    PostHog slack_incoming_webhook Server-Side Request Forgery Information Disclosure Vulnerability
    cvelistv5