CVE-2025-9799

Langfuse Webhook promptRouter.ts promptChangeEventSourcing server-side request forgery

MEDIUM
5
CVSS Score
Published: September 1, 2025 at 10:02 PM UTC
Updated: October 19, 2026 at 05:10 PM UTC
1 product affected across 1 vendorLangfuse

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Severity
MEDIUM5
Exploit prediction
EPSS 0.3%
SSVC
PoC

Description

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. Performing manipulation results in server-side request forgery. The attack may be initiated remotely. A high degree of complexity is needed for the attack. The exploitation appears to be difficult. The exploit has been released to the public and may be exploited.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (5)

SignaturePermissions RequiredVDB Entry
https://vuldb.com/?ctiid.322114
VDB EntryTechnical DescriptionThird Party Advisory
https://vuldb.com/?id.322114
Third Party AdvisoryVDB Entry
https://vuldb.com/?submit.641128

SSVC — Action Prioritization

SSVCPoCNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5MEDIUMVulDB
Vector?

Quick Info

StatusANALYZED
CWE
CWE-918

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