{"id":"CVE-2026-70617","title":"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 with…","summary":"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 with…","severity":"high","cvss":8.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","cwe":["CWE-862"],"published":"2026-08-05","updated":"2026-09-16","sourceUpdated":"2026-09-16T20:34:51.637","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-70617","references":[{"url":"https://github.com/spacebarchat/server/commit/dcfd91035e3da42abf5f32d8d86a35219225b3d4","label":"disclosure@vulncheck.com"},{"url":"https://github.com/spacebarchat/server/security/advisories/GHSA-g38j-78fh-jm74","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/spacebar-server-missing-authorization-via-group-dm-recipient-endpoint","label":"disclosure@vulncheck.com"},{"url":"https://github.com/spacebarchat/server/security/advisories/GHSA-g38j-78fh-jm74","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd"],"epss":0.00413,"epssPercentile":0.32723,"ingestedAt":"2026-09-16T21:05:36.833Z","slug":"CVE-2026-70617","body":"## Overview\n\nSpacebar 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":45,"depthScoreParts":{"impact":44.6,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}