CVE-2025-9799: langfuse SSRF — Exploit

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.

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CVSS v3.1 Score

5.0

MEDIUM

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

Weakness Type (CWE)

CWE-918 Server-Side Request Forgery (SSRF)

Affected Products

Vendor	Product	Versions
langfuse	langfuse	< 3.88.0

References

Exploits

https://github.com/langfuse/langfuse/issues/8522 https://github.com/langfuse/langfuse/issues/8522#issue-3320549867

Other References

https://vuldb.com/?ctiid.322114 https://vuldb.com/?id.322114 https://vuldb.com/?submit.641128

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. It has a CVSS v3.1 base score of 5.0 (MEDIUM).

How severe is CVE-2025-9799? +

CVE-2025-9799 has a CVSS v3.1 score of 5.0 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-9799? +

CVE-2025-9799 affects products from langfuse, specifically: langfuse. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-9799? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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