CVE-2026-42889
CRITICAL EPSS 28.5%
Published May 12, 20261mo ago · Modified Jun 17, 20262w ago
9.1 CVSS 3.1
Published May 12, 2026 1mo ago
Last Modified Jun 17, 2026 2w ago
Description
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.
CVSS Details
Base Score
Exploitability
Impact
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability None
Threat Intelligence
EPSS Exploit Probability
28.5% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available
Weaknesses 2
CWE-639
CWE-863 Incorrect Authorization Authorization
References 1
- github.com https://github.com/No-Instructions/relay-server/security/advisories/GHSA-9vp9-8q9j-8mqm
Remediation
No remediation data recorded yet
Check vendor advisories and the NVD entry for patch availability.