How severe is CVE-2025-9799?

CVE-2025-9799 has a CVSS 3.x base score of 5.0, rated medium severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.

Is CVE-2025-9799 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-9799?

CVE-2025-9799 affects Langfuse. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-9799?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-9799 have an EU (EUVD) identifier?

Yes. CVE-2025-9799 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-26361.

When was CVE-2025-9799 published?

CVE-2025-9799 was published on 2025-09-01 and last updated on 2026-06-17.

CVE-2025-9799

CVE-2025-9799 is a medium-severity vulnerability in Langfuse with a CVSS 3.x base score of 5.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-918.

Key facts

Severity: Medium (CVSS 3.x base score 5.0)
CVSS v2: 4.6
CVSS v4: 1.3
EPSS exploit prediction: 0% (17th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-26361
Weakness: CWE-918
Affected product: Langfuse
Published: 2025-09-01
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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. 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.
How severe is CVE-2025-9799?: CVE-2025-9799 has a CVSS 3.x base score of 5.0, rated medium severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.
Is CVE-2025-9799 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-9799?: CVE-2025-9799 affects Langfuse. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-9799?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-9799 have an EU (EUVD) identifier?: Yes. CVE-2025-9799 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-26361.
When was CVE-2025-9799 published?: CVE-2025-9799 was published on 2025-09-01 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:langfuse:langfuse:*:*:*:*:*:*:*:*

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