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.
Affected products
langfuse: langfuse
References5
- github.com/langfuse/langfuse/issues/8522 ExploitIssue Tracking
- github.com/langfuse/langfuse/issues/8522#issue-3320549867 ExploitIssue Tracking
- vuldb.com/?ctiid.322114 Permissions RequiredVDB Entry
- vuldb.com/?id.322114 Third Party AdvisoryVDB Entry
- vuldb.com/?submit.641128 Third Party AdvisoryVDB Entry
Metrics
- CVSS 3.1
-
5.0
MEDIUM
Score source: CNA
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L - CVSS 4.0
-
1.3
LOW
Score source: CNA
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 — exploit probability
- 0% percentile: 23 · as of 8 November 2026
- CWE
- CWE-918
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.