{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:onyx:onyx:*:*:*:*:*:*:*:*",
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "3.0.9"
              },
              {
                "introduced": "3.1.0"
              },
              {
                "fixed": "3.1.6"
              },
              {
                "introduced": "3.2.0"
              },
              {
                "fixed": "3.2.6"
              }
            ],
            "source": "CPE_RANGE"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "90aecacbebe5f08e19a9b4ae1ee9b4737991d573"
            },
            {
              "introduced": "b9e84c42a8b796e1b94e553abf079ffddfbb444c"
            },
            {
              "fixed": "b51c9970aaa1c87b80c6653079405cc051ee4778"
            },
            {
              "introduced": "c4f8d5370b8369176a77f0788da3fc4b133fb2db"
            },
            {
              "fixed": "87f8e5d3cca6dd4d277d9dfff1e367ee0772540b"
            }
          ],
          "repo": "https://github.com/onyx-dot-app/onyx",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-rw6w-hp62-gc8w"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-639"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42276.json"
  },
  "details": "Onyx is an open-source AI platform. Prior to versions 3.0.9, 3.1.6, and 3.2.6, the POST /chat/stop-chat-session/{chat_session_id} endpoint lets any authenticated user stop any other user's active chat session. The endpoint checks authentication but never verifies the session belongs to the caller. An attacker who knows a chat session UUID can kill another user's LLM generation mid-stream. This issue has been patched in versions 3.0.9, 3.1.6, and 3.2.6.",
  "id": "CVE-2026-42276",
  "modified": "2026-07-15T01:49:05.047023957Z",
  "published": "2026-05-08T03:49:56.765Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42276.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/onyx-dot-app/onyx/security/advisories/GHSA-rw6w-hp62-gc8w"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42276"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Onyx: IDOR in /chat/stop-chat-session allows any authenticated user to interrupt other users chat sessions"
}