CVE-2026-70617Spacebar Server Missing Authorization via Group DM Recipient Endpoint
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No exploitation reported and no EPSS estimate yet.
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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
- 8.1 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
- Weakness (CWE)
- CWE-862
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- VulnCheck
- NVD analysis
- Deferred
- Record last updated
- Aug 6, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Spacebar Server Spacebar Server spacebar_server:spacebar_server (from the name) | through dcfd91035e3da42abf5f32d8d86a35219225b3d4 | CNA record |
References
- https://github.com/spacebarchat/server/security/advisories/GHSA-g38j-78fh-jm74vendor-advisory
- https://github.com/spacebarchat/server/commit/dcfd91035e3da42abf5f32d8d86a35219225b3d4patch
- https://www.vulncheck.com/advisories/spacebar-server-missing-authorization-via-group-dm-recipient-endpointthird-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.