SSRF in Langfuse
CVE-2025-9799
A security flaw has been discovered in Langfuse up to 3.88.0. Affected by this vulnerability is the function promptChangeEventSourcing of the file web/src/features/prompts/server/routers/promptRouter.ts of the component Webhook Handler. Pe…
Vulnerability class: SSRF (Server-Side Request Forgery)
EPSS: 0.001 (20.4th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.0 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L.
Affected products
- Langfuse
- N/a Langfuse — versions 3.0, 3.1, 3.2
Weakness classification (CWE)
Public proof-of-concept exploits
References
- VDB-322114 | Langfuse Webhook promptRouter.ts promptChangeEventSourcing server-side request forgery (technical-description, Third Party Advisory, VDB Entry, vdb-entry)
- VDB-322114 | CTI Indicators (IOB, IOC, IOA) (signature, Permissions Required, permissions-required, VDB Entry)
- Submit #641128 | langfuse https://github.com/langfuse/langfuse <=3.88.0 SSRF (Third Party Advisory, VDB Entry, third-party-advisory)
- cna@vuldb.com (issue-tracking, Exploit, Issue Tracking)
- cna@vuldb.com (issue-tracking, Exploit, exploit, Issue Tracking)
Frequently asked questions
- What is CVE-2025-9799?
- CVE-2025-9799 is a medium-severity vulnerability in Langfuse, classified under Server-Side Request Forgery (SSRF). CVSS score: 5.0/10. Published 2025-09-01.
- How severe is CVE-2025-9799?
- Medium severity. CVSS v3 base score is 5.0 out of 10.
- Is CVE-2025-9799 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.