CVE-2026-69114: Spacebar Server Cross-Channel Message Deletion via Permission Check Bypass

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-10 · updated 2026-09-17
Weakness: CWE-639

Description

Spacebar Server before commit 8d126f4 contains a cross-channel message deletion vulnerability in the single-delete and bulk-delete message handlers that fail to scope message queries to the requested channel. Authenticated users with MANAGE_MESSAGES permission in any controlled channel can delete arbitrary messages in other channels by routing delete requests through their own channel.

Affected products

Spacebar Server: all versions

References

https://github.com/spacebarchat/server/commit/8d126f401914d68fa8a97f7e5986dcfcc42de9a8
https://github.com/spacebarchat/server/issues/1685
https://github.com/spacebarchat/server/security/advisories/GHSA-62g6-28hv-h6hc
https://www.vulncheck.com/advisories/spacebar-server-cross-channel-message-deletion-via-permission-check-bypass
https://github.com/spacebarchat/server/security/advisories/GHSA-62g6-28hv-h6hc

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