Which versions of Langfuse are affected by CVE-2025-9799?

CVE-2025-9799 is a low-severity vulnerability in Langfuse involving SSRF (CVSS 2.3).

Is there a public PoC exploit available for CVE-2025-9799?

Yes, a public proof-of-concept exploit is available for CVE-2025-9799. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2025-9799?

During next maintenance window: Apply vendor patches when convenient. Monitor vendor channels for updates.

Langfuse CVE-2025-9799

Q: What is the CVSS score of CVE-2025-9799?

CVE-2025-9799 has a CVSS 4.0 base score of 1.3 (Low). CVSS vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X. EPSS exploitation probability: 0.0%.

LOW

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

2025-09-01 cna@vuldb.com

SSRF Langfuse

1.3

CVSS 4.0 · NVD

Severity by source

NVD PRIMARY

1.3 LOW

CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Lifecycle Timeline

CVSS changed

Apr 29, 2026 - 01:11 NVD

2.3 (LOW) 1.3 (LOW)

Analysis Generated

Mar 28, 2026 - 19:09 vuln.today

PoC Detected

Dec 02, 2025 - 19:04 vuln.today

Public exploit code

CVE Published

Sep 01, 2025 - 22:15 nvd

LOW 2.3

DescriptionCVE.org

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.

AnalysisAI

A security flaw has been discovered in Langfuse up to 3.88.0. Rated low severity (CVSS 2.3), this vulnerability is remotely exploitable. Public exploit code available and no vendor patch available.

Technical ContextAI

This vulnerability is classified as Server-Side Request Forgery (SSRF) (CWE-918), which allows attackers to make the server perform requests to unintended internal or external resources. 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. Affected products include: Langfuse. Version information: up to 3.88.0..

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Validate and allowlist destination URLs, block requests to internal networks, use network segmentation.