{"id":"CVE-2026-70617","summary":"Spacebar Server Missing Authorization via Group DM Recipient Endpoint","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.","aliases":["GHSA-g38j-78fh-jm74"],"modified":"2026-08-08T03:30:13.742538162Z","published":"2026-08-05T19:53:34.826Z","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"}]},"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/spacebarchat/server","events":[{"introduced":"0"},{"fixed":"dcfd91035e3da42abf5f32d8d86a35219225b3d4"}],"database_specific":{"source":"REFERENCES"}}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-70617.json"}}],"schema_version":"1.8.0","severity":[{"type":"CVSS_V4","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"}]}