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Vulnerabilities

Vulnerability · CVE-2025-1521

PostHog slack_incoming_webhook Server-Side Request Forgery Information Disclosure Vulnerability.

Published Apr 23, 2025 · catalog updated Apr 23, 2025 · PostHog slack_incoming_webhook Server-Side Request

Check this week

CVE-2025-1521 is not in CISA KEV. FIRST estimates a 66.00% chance of exploitation in the next 30 days. Check whether you run PostHog slack_incoming_webhook Server-Side Request.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (PostHog slack_incoming_webhook Server-Side Request).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.1
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
66.00%
Remediation
Vendor / distro source
Affected products
vendor posthog posthog b8817c14065c23159dcf52849f0bdcd12516c43e

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor posthog posthog b8817c14065c23159dcf52849f0bdcd12516c43eb8817c14065c23159dcf52849f0bdcd12516c43e

How to fix CVE-2025-1521

  • Recommended remediation

    A vendor or distribution source is linked. Check that advisory for patch availability; this catalog does not invent fix status.

  • Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2025-1521 is not in CISA KEV. FIRST estimates a 66.00% chance of exploitation in the next 30 days. Check whether you run PostHog slack_incoming_webhook Server-Side Request.

Which versions are affected?

Compare what you have installed with posthog posthog b8817c14065c23159dcf52849f0bdcd12516c43e b8817c14065c23159dcf52849f0bdcd12516c43e. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 66.00%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Apr 23, 2025 · EUVD

    Detected

    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

  2. Apr 23, 2025 · EUVD

    Updated

    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

Sources

  • EUVDVulnerability recordEUVD-2025-12185

    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 specif

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.