What’s Vulnerable › Vulnerabilities

CVE-2025-1520: PostHog ClickHouse Table Functions SQL Injection Remote Code Execution Vulnerability

• Severity: high (CVSS 8.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-04-23 · updated 2026-06-17
• Weakness: CWE-89

Description

PostHog ClickHouse Table Functions SQL Injection Remote Code Execution Vulnerability. This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of PostHog. Authentication is required to exploit this vulnerability. The specific flaw exists within the implementation of the SQL parser. The issue results from the lack of proper validation of a user-supplied string before using it to construct SQL queries. An attacker can leverage this vulnerability to execute code in the context of the database account. Was ZDI-CAN-25350.

Affected products

• PostHog: before 0.3.7 — fixed in 0.3.7

How to fix

Upgrade to a fixed version: PostHog 0.3.7. Check the vendor advisory for mitigations.

References

• https://github.com/PostHog/posthog/commit/6e8f035f9acd339c5ba87ba6ea40fc1ab3053d42
• https://www.zerodayinitiative.com/advisories/ZDI-25-099/

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