Potential for cross-site scripting in PostHog-js
Impact
Potential for cross-site scripting in posthog-js.
Patches
The problem has been patched in posthog-js version 1.57.2.
Workarounds
- This isn't an issue for sites that have a Content Security Policy in place.
- Using the HTML tracking snippet on PostHog Cloud always guarantees the latest version of the library – in that case no action is required to upgrade to the patched version.
References
We will publish details of the vulnerability in 30 days as per our security policy.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | posthog-js | < 1.57.2 | 1.57.2 |
References
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N- Weakness (CWE)
CWE-79- Platform
- npm
- Package
posthog-js- Disclosed
- 22.05.2023
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-8775-5hwv-wr6v - CC BY 4.0
Vulnerability history: posthog-js
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
This is the only known vulnerability of this package.
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