{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 4.5.114"
      },
      "package": {
        "ecosystem": "PyPI",
        "name": "praisonai"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.5.115"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-39889"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-200"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-08T19:21:14Z",
    "nvd_published_at": "2026-04-08T21:17:01Z",
    "severity": "HIGH"
  },
  "details": "The A2U (Agent-to-User) event stream server in PraisonAI exposes all agent activity without authentication. This is a separate component from the gateway server fixed in CVE-2026-34952.\n\nThe create_a2u_routes() function registers the following endpoints with NO authentication checks:\n- GET  /a2u/info       \u2014 exposes server info and stream names\n- POST /a2u/subscribe  \u2014 creates event stream subscription\n- GET  /a2u/events/{stream_name} \u2014 streams ALL agent events\n- GET  /a2u/events/sub/{id}     \u2014 streams events for subscription\n- GET  /a2u/health     \u2014 health check\n\n\nAn unauthenticated attacker can:\n1. POST /a2u/subscribe \u2192 receive subscription_id\n2. GET /a2u/events/sub/{subscription_id} \u2192 receive live SSE stream \n   of all agent events including responses, tool calls, and thinking\n\nThis exposes sensitive agent activity including responses, internal  reasoning, and tool call arguments to any network attacker.\n\n\u003cimg width=\"1512\" height=\"947\" alt=\"image\" src=\"https://github.com/user-attachments/assets/3438f3ea-75ec-4978-9dd9-d9a6da42c248\" /\u003e\n\n\u003cimg width=\"1512\" height=\"571\" alt=\"image\" src=\"https://github.com/user-attachments/assets/ee3313f6-f522-48f7-9c06-e5e265c6aeb4\" /\u003e\n\n\n[1] POST /a2u/subscribe (no auth token)\n    Status: 200\n    Response: {\"subscription_id\":\"sub-a1ad8a6edd8b\",\"stream_name\":\"events\",\n    \"stream_url\":\"http://testserver/a2u/events/sub-a1ad8a6edd8b\"}\n    Got subscription_id: sub-a1ad8a6edd8b\n\n[2] GET /a2u/info (no auth token)\n    Status: 200\n    Response: {\"name\":\"A2U Event Stream\",\"version\":\"1.0.0\",\n    \"streams\":[\"events\"],\"event_types\":[\"agent.started\",\"agent.thinking\",\n    \"agent.tool_call\",\"agent.response\",\"agent.completed\",\"agent.error\"]}\n\n[3] GET /a2u/health (no auth token)  \n    Status: 200\n    Response: {\"status\":\"healthy\",\"active_subscriptions\":1,\"active_streams\":1}\n\n\nImpact: Attacker can subscribe and receive ALL agent events including responses, tool calls, and internal reasoning in real-time",
  "id": "GHSA-f292-66h9-fpmf",
  "modified": "2026-04-09T14:29:15Z",
  "published": "2026-04-08T19:21:14Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-f292-66h9-fpmf"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-39889"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/MervinPraison/PraisonAI"
    },
    {
      "type": "WEB",
      "url": "https://github.com/MervinPraison/PraisonAI/releases/tag/v4.5.115"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "PraisonAI Has Unauthenticated SSE Event Stream that Exposes All Agent Activity in A2U Server"
}

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "PraisonAI is a multi-agent teams system. Prior to 4.5.115, the A2U (Agent-to-User) event stream server in PraisonAI exposes all agent activity without authentication. The create_a2u_routes() function registers the following endpoints with NO authentication checks: /a2u/info, /a2u/subscribe, /a2u/events/{stream_name}, /a2u/events/sub/{id}, and /a2u/health. This vulnerability is fixed in 4.5.115."
    }
  ],
  "id": "CVE-2026-39889",
  "lastModified": "2026-04-08T21:25:14.927",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-04-08T21:17:01.130",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-f292-66h9-fpmf"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Undergoing Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-200"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}