CVE-2025-9799Langfuse Webhook promptRouter.ts promptChangeEventSourcing server-side request forgery
- 2.3LowCVSS base score
- 0.30%Exploitation in 30 daysEPSS · top 77% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- YesPublic exploitsa reference or SSVC says so
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.
Public exploit
An exploit or proof of concept is public: anyone can try it against an unpatched system. A reference of the record is tagged as an exploit. CISA's SSVC rates its exploitation: a proof of concept is public.
Show the exploits1
References tagged exploit1 reference
Timeline
ID reserved
By VulDB
Published
- 1 day later
· 1 day later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| VulDBCNA (assigner) | 4.0 | Low2.3 | 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 |
| VulDBCNA (assigner) | 3.1 | Medium5.0 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R |
| VulDBCNA (assigner) | 3.0 | Medium5.0 | CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R |
| VulDBCNA (assigner) | 2.0 | Medium4.6 | AV:N/AC:H/Au:S/C:P/I:P/A:P/E:POC/RL:ND/RC:UR |
| NVDNVD · Analyzed | 4.0 | Low1.3 | 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 in 30 days)
- 0.30% · top 77% of all CVEs (12 Nov 2026)
- CISA SSVC
- Exploitation: poc · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Low 2.3.
Affected products
Langfuse
- affected 3.0
- affected 3.1
- affected 3.2
- affected 3.3
- affected 3.4
- affected 3.5
- affected 3.6
- affected 3.7
- affected 3.8
- affected 3.9
- affected 3.10
- affected 3.11
- affected 3.12
- affected 3.13
- affected 3.14
- affected 3.15
- affected 3.16
- affected 3.17
- affected 3.18
- affected 3.19
- affected 3.20
- affected 3.21
- affected 3.22
- affected 3.23
- affected 3.24
- affected 3.25
- affected 3.26
- affected 3.27
- affected 3.28
- affected 3.29
- affected 3.30
- affected 3.31
- affected 3.32
- affected 3.33
- affected 3.34
- affected 3.35
- affected 3.36
- affected 3.37
- affected 3.38
- affected 3.39
- and 49 more
References
References5
- VDB-322114 | Langfuse Webhook promptRouter.ts promptChangeEventSourcing server-side request forgery (opens in a new tab)vdb-entrytechnical-description
- VDB-322114 | CTI Indicators (IOB, IOC, IOA) (opens in a new tab)signaturepermissions-required
- Submit #641128 | langfuse https://github.com/langfuse/langfuse <=3.88.0 SSRF (opens in a new tab)third-party-advisory
- https://github.com/langfuse/langfuse/issues/8522 (opens in a new tab)issue-tracking
- https://github.com/langfuse/langfuse/issues/8522#issue-3320549867 (opens in a new tab)exploitissue-tracking
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2025-26361 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2025-9799)Record last updated .