CVE-2026-42889 - Vulnerability Analysis

Overview

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.

Severity & Score

References

• https://github.com/No-Instructions/relay-server/security/advisories/GHSA-9vp9-8q9j-8mqm

Related Resources

• Vulnerability Intelligence Dashboard
• Credential Scanner