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TI-2025-08988 Aliases CVE-2025-9799GHSA-6fxv-w47f-g229

Langfuse Webhook promptRouter.ts promptChangeEventSourcing server-side request forgery

Priority MEDIUM 45CWE-918Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
High
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
Low · Low · Low
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00299 22nd percentileScored 2026-11-07
Public exploit Yes 2 exploit referencesTagged by NVD and the CNA
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
—Langfuse3.0; 3.1; 3.2; 3.3; 3.4; 3.5; 3.6; 3.7; 3.8; 3.9; 3.10; 3.11; 3.12; 3.13; 3.14; 3.15; 3.16; 3.17; 3.18; 3.19; 3.20; 3.21; 3.22; 3.23; 3.24; 3.25; 3.26; 3.27; 3.28; 3.29; 3.30; 3.31; 3.32; 3.33; 3.34; 3.35; 3.36; 3.37; 3.38; 3.39; 3.40; 3.41; 3.42; 3.43; 3.44; 3.45; 3.46; 3.47; 3.48; 3.49; 3.50; 3.51; 3.52; 3.53; 3.54; 3.55; 3.56; 3.57; 3.58; 3.59; 3.60; 3.61; 3.62; 3.63; 3.64; 3.65; 3.66; 3.67; 3.68; 3.69; 3.70; 3.71; 3.72; 3.73; 3.74; 3.75; 3.76; 3.77; 3.78; 3.79; 3.80; 3.81; 3.82; 3.83; 3.84; 3.85; 3.86; 3.87; 3.88.0—No fix listedCNA
  • Langfuse Vendor— Affected 3.0; 3.1; 3.2; 3.3; 3.4; 3.5; 3.6; 3.7; 3.8; 3.9; 3.10; 3.11; 3.12; 3.13; 3.14; 3.15; 3.16; 3.17; 3.18; 3.19; 3.20; 3.21; 3.22; 3.23; 3.24; 3.25; 3.26; 3.27; 3.28; 3.29; 3.30; 3.31; 3.32; 3.33; 3.34; 3.35; 3.36; 3.37; 3.38; 3.39; 3.40; 3.41; 3.42; 3.43; 3.44; 3.45; 3.46; 3.47; 3.48; 3.49; 3.50; 3.51; 3.52; 3.53; 3.54; 3.55; 3.56; 3.57; 3.58; 3.59; 3.60; 3.61; 3.62; 3.63; 3.64; 3.65; 3.66; 3.67; 3.68; 3.69; 3.70; 3.71; 3.72; 3.73; 3.74; 3.75; 3.76; 3.77; 3.78; 3.79; 3.80; 3.81; 3.82; 3.83; 3.84; 3.85; 3.86; 3.87; 3.88.0 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:langfuse:langfuse:*:*:*:*:*:*:*:*up to 3.88.0Vulnerablelangfuse
  • cpe:2.3:a:langfuse:langfuse:*:*:*:*:*:*:*:* Versions up to 3.88.0 Vulnerable ·langfuse

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-9799
  2. 2026-10-03 Alias added: GHSA-6fxv-w47f-g229

References

Exploit 2

  • TI-2025-36879 Improper authorization in the background migration endpoints of Langfuse 3.1 before… CVSS 3.1HIGH 7.6
  • TI-2026-19383 Langfuse Slack OAuth Installation Endpoint Lacks Authentication, Enabling Arbitrary Project Linking CVSS 4.0MEDIUM 6.3
  • TI-2026-30074 Improper access control in langfuse CVSS 4.0MEDIUM 5.3
  • TI-2025-40259 Langfuse SSO Account Takeover via CSRF or phishing attack CVSS 3.1MEDIUM 6.5
  • TI-2025-39896 Langfuse vulnerable to cross‑organization enumeration of member & invitation lists via project membership APIs CVSS 3.1MEDIUM 5.0

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences