CVE-2026-42889
Critical · 9.1CVSS
9.1
EPSS
0.5%
Published
May 12, 2026
CISA due date
—
The record
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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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