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.
Metrics
Affected Vendors & Products
References
History
Fri, 07 Aug 2026 10:30:00 +0000
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Spacebar Server
Spacebar Server spacebar Server |
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| Vendors & Products |
Spacebar Server
Spacebar Server spacebar Server |
Thu, 06 Aug 2026 18:30:00 +0000
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| Metrics |
ssvc
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Wed, 05 Aug 2026 20:15:00 +0000
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| 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. | |
| Title | Spacebar Server Missing Authorization via Group DM Recipient Endpoint | |
| Weaknesses | CWE-862 | |
| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: VulnCheck
Published: 2026-08-05T19:53:34.826Z
Updated: 2026-08-06T18:07:53.147Z
Reserved: 2026-08-04T20:17:18.296Z
Link: CVE-2026-70617
Updated: 2026-08-06T17:54:36.211Z
Status : Received
Published: 2026-08-05T20:17:17.770
Modified: 2026-08-06T22:18:26.810
Link: CVE-2026-70617
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