CVE-2025-9799

Name: CVE-2025-9799
Creator: NVD / NIST
Published: 2025-09-01T22:15:31.283+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

LOWCVSS 1.3/10EPSS 0.26%

Last modified Jun 17, 2026

CVE-2025-9799 is a low-severity vulnerability rated 1.3/10 on the CVSS scale. 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. EPSS estimates a 0.26% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5/10

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L

CVSS 4.0

1.3/10

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 Probability

0.26%

16.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-918

Affected Software

Vendor	Product	Versions
Langfuse	Langfuse	<= 3.88.0

References

https://github.com/langfuse/langfuse/issues/8522Exploit, Issue Tracking
https://github.com/langfuse/langfuse/issues/8522#issue-3320549867Exploit, Issue Tracking
https://vuldb.com/?ctiid.322114Permissions Required, VDB Entry
https://vuldb.com/?id.322114Third Party Advisory, VDB Entry
https://vuldb.com/?submit.641128Third Party Advisory, VDB Entry

Timeline

Published: Sep 1, 2025
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2025-9799?

How severe is CVE-2025-9799?

CVE-2025-9799 has a CVSS score of 1.3/10 (LOW severity). The EPSS model estimates a 0.26% probability of exploitation in the next 30 days.

How do I fix CVE-2025-9799?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-9799?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST