Vulnerability Description
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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/spacebarchat/server/commit/dcfd91035e3da42abf5f32d8d86a352192
- https://github.com/spacebarchat/server/security/advisories/GHSA-g38j-78fh-jm74
- https://www.vulncheck.com/advisories/spacebar-server-missing-authorization-via-g
- https://github.com/spacebarchat/server/security/advisories/GHSA-g38j-78fh-jm74
FAQ
What is CVE-2026-70617?
CVE-2026-70617 is a vulnerability with a CVSS score of 8.1 (HIGH). 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...
How severe is CVE-2026-70617?
CVE-2026-70617 has been rated HIGH with a CVSS base score of 8.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-70617?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.