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Langfuse Webhook promptRouter.ts promptChangeEventSourcing server-side request forgery

Type: advisorySources: OSV

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.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2025-9799
Confirmed fixed CVEs
Not specified
Updated in this feed
7 Nov 2026, 13:23 UTC · Revision 1

Source evidence

Langfuse Webhook promptRouter.ts promptChangeEventSourcing server-side request forgery

core-osv · Original source

Published 1 Sept 2025, 22:02 UTC

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.

osv:CVE-2025-9799
Complete source record
{
  "id": "16f38676b83c268bdd4b903ad3055974362949a75c36b9451e0399db9e0f7598",
  "url": "https://osv.dev/vulnerability/CVE-2025-9799",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Langfuse Webhook promptRouter.ts promptChangeEventSourcing server-side request forgery",
    "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.",
    "evidence": "osv:CVE-2025-9799",
    "products": [],
    "severity": "low",
    "structured": {
      "id": "CVE-2025-9799",
      "aliases": [
        "CVE-2025-9799"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "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"
        }
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-9799.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:50.707061305Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/9xxx/CVE-2025-9799.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-9799",
        "https://vuldb.com/?id.322114",
        "https://vuldb.com/?submit.641128",
        "https://github.com/langfuse/langfuse/issues/8522",
        "https://github.com/langfuse/langfuse/issues/8522#issue-3320549867",
        "https://vuldb.com/?ctiid.322114"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-918"
        ],
        "cna_assigner": "VulDB",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/9xxx/CVE-2025-9799.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-9799",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 519438,
  "published_at": "2025-09-01T22:02:09.356+00:00"
}