CVE-2026-70617 | BDVDB-2026-355601 Detail

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.

Impact#

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Exploit#

History#

1. Version 12026-08-05Record published in the CVE List.
2. Version 22026-08-06Most recent update recorded in the CVE List.