CVE-2026-70617 — Spacebar Server Missing Authorization via Group DM Recipient Endpoint
Spacebar Server before commit dcfd910 contains a missing authorization vulnerability that allows any authenticated attacker to add themselves to arbitrary group DM channels by s…
Published: 2026-08-05 · CVSS: 8.6 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7