CVE-2026-31950

{
  "id": "CVE-2026-31950",
  "sourceIdentifier": "[email protected]",
  "published": "2026-03-27T20:16:30.217",
  "lastModified": "2026-10-26T21:10:00.170",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "LibreChat is a ChatGPT clone with additional features. In versions 0.8.2-rc2 through 0.8.2-rc3, the SSE streaming endpoint `/api/agents/chat/stream/:streamId` does not verify that the requesting user owns the stream. Any authenticated user who obtains or guesses a valid stream ID can subscribe and read another user's real-time chat content, including messages, AI responses, and tool invocations. Version 0.8.2 patches the issue."
    },
    {
      "lang": "es",
      "value": "LibreChat es un clon de ChatGPT con características adicionales. En las versiones 0.8.2-rc2 hasta 0.8.2-rc3, el endpoint de streaming SSE “/API/agents/chat/stream/:streamId” no verifica que el usuario solicitante sea el propietario del stream. Cualquier usuario autenticado que obtenga o adivine un ID de stream válido puede suscribirse y leer el contenido de chat en tiempo real de otro usuario, incluyendo mensajes, respuestas de IA e invocaciones de herramientas. La versión 0.8.2 corrige el problema."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "danny-avila",
          "product": "LibreChat",
          "versions": [
            {
              "version": ">= 0.8.2-rc2, < 0.8.2",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "attackVector": "NETWORK",
          "attackComplexity": "HIGH",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "availabilityImpact": "NONE"
        },
        "exploitabilityScore": 1.6,
        "impactScore": 3.6
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-03-27T19:55:17.212435Z",
          "id": "CVE-2026-31950",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-284"
        }
      ]
    },
    {
      "source": "[email protected]",
      "type": "Primary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-639"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:librechat:librechat:0.8.2:rc2:*:*:*:*:*:*",
              "matchCriteriaId": "21865C8B-C628-4275-A552-89F64EF22918"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:librechat:librechat:0.8.2:rc3:*:*:*:*:*:*",
              "matchCriteriaId": "47A1B487-1A7B-4E06-8503-56E7D349FAA2"
            }
          ]
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/danny-avila/LibreChat/security/advisories/GHSA-f6rf-vm44-wh5g",
      "source": "[email protected]",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ]
    }
  ]
}