{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "source": "REFERENCES"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "dcfd91035e3da42abf5f32d8d86a35219225b3d4"
            }
          ],
          "repo": "https://github.com/spacebarchat/server",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-g38j-78fh-jm74"
  ],
  "database_specific": {
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
      "CWE-862"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/70xxx/CVE-2026-70617.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "last_affected": "dcfd91035e3da42abf5f32d8d86a35219225b3d4"
          }
        ],
        "source": "AFFECTED_FIELD"
      }
    ]
  },
  "details": "Spacebar Server before commit dcfd910 contains a missing authorization vulnerability that allows any authenticated attacker to add themselves to arbitrary group DM channels by sending a PUT request to the channels recipient endpoint without membership verification. Attackers can exploit the unguarded PUT /channels/{channel_id}/recipients/{user_id} handler to join private group DMs, read complete message history, post messages as a participant, and force-add third-party users without their consent.",
  "id": "CVE-2026-70617",
  "modified": "2026-08-08T03:30:13.742538162Z",
  "published": "2026-08-05T19:53:34.826Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/70xxx/CVE-2026-70617.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/spacebarchat/server/security/advisories/GHSA-g38j-78fh-jm74"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-70617"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.vulncheck.com/advisories/spacebar-server-missing-authorization-via-group-dm-recipient-endpoint"
    },
    {
      "type": "FIX",
      "url": "https://github.com/spacebarchat/server/commit/dcfd91035e3da42abf5f32d8d86a35219225b3d4"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/spacebarchat/server"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Spacebar Server Missing Authorization via Group DM Recipient Endpoint"
}