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CVE-2025-1521— PostHog slack_incoming_webhook Server-Side Request Forgery Information Disclosure Vulnerability

Quick assessment

Affected
PostHog PostHog
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

PostHog是PostHog开源的一个一体化的开源平台。 PostHog存在代码问题漏洞，该漏洞源于slack_incoming_webhook参数处理时未验证URI，可能导致服务端请求伪造和信息泄露。

AI Predicted 6.5 Difficulty: Easy EPSS 0.61% · P46
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I. Basic Information for CVE-2025-1521

Vulnerability Information
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Vulnerability Title
PostHog slack_incoming_webhook Server-Side Request Forgery Information Disclosure Vulnerability
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
PostHog 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
PostHog是PostHog开源的一个一体化的开源平台。 PostHog存在代码问题漏洞，该漏洞源于slack_incoming_webhook参数处理时未验证URI，可能导致服务端请求伪造和信息泄露。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
PostHog PostHog b8817c14065c23159dcf52849f0bdcd12516c43e -

II. Public POCs for CVE-2025-1521

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III. Intelligence Information for CVE-2025-1521

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Patches & Fixes for CVE-2025-1521 (1)

Vendor Advisories for CVE-2025-1521 (1)

Same Patch Batch · PostHog · 2025-04-23 · 3 CVEs total

CVE-2025-1522 PostHog database_schema Server-Side Request Forgery Information Disclosure Vulnerability
CVE-2025-1520 PostHog ClickHouse Table Functions SQL Injection Remote Code Execution Vulnerability

IV. Related Vulnerabilities

Same product: PostHog
Same vendor: PostHog
Same weakness: CWE-918

V. Comments for CVE-2025-1521

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