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.

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: 0.003 (17.2th 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)

CWE-918 — Server-Side Request Forgery (SSRF)

Public proof-of-concept exploits

References

cna@vuldb.com (technical-description, VDB Entry, Third Party Advisory, vdb-entry)
cna@vuldb.com (signature, Permissions Required, permissions-required, VDB Entry)
cna@vuldb.com (VDB Entry, Third Party Advisory, 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.