CVE-2026-42889
Relay adds real-time collaboration to Obsidian. Relay Server versions 0.9.0 through 0.9.6 contain an authentication bypass in the multi-document WebSocket endpoints. When authentication is configured, WebSocket connections without a token query parameter were incorrectly treated as having full server permissions. An unauthenticated network attacker who knows or guesses a document ID could connect to the document sync WebSocket and read or modify document contents without a valid document token. This vulnerability is fixed in 0.9.7.
- Score
- CVSS 3.1 9.1 Critical
- Status
- Deferred - security-advisories@github.com
- Published
- 2026-05-12
- Last modified
- 2026-10-26
- Weaknesses
- CWE-639, CWE-863
Affected products
References
- https://github.com/No-Instructions/relay-server/security/advisories/GHSA-9vp9-8q9j-8mqm
