CVE-2026-42889: CWE-863: Incorrect Authorization in No-Instructions relay-server
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.
AI Analysis
Technical Summary
No-Instructions relay-server versions 0.9.0 to 0.9.6 contain an incorrect authorization vulnerability (CWE-863) in their multi-document WebSocket endpoints. When authentication is enabled, WebSocket connections missing a token query parameter are incorrectly treated as fully authorized, enabling unauthenticated attackers to access and modify document data by connecting to the document sync WebSocket with a known or guessed document ID. This flaw allows unauthorized read and write access to documents. The issue is resolved in relay-server version 0.9.7.
Potential Impact
An unauthenticated network attacker can bypass authentication controls and gain full read and write access to documents synchronized via the relay-server WebSocket endpoints. This compromises confidentiality and integrity of document contents. Availability is not impacted. The CVSS 3.1 base score is 9.1 (critical), reflecting network attack vector, no privileges required, no user interaction, and high impact on confidentiality and integrity.
Mitigation Recommendations
This vulnerability is fixed in No-Instructions relay-server version 0.9.7. Users should upgrade to version 0.9.7 or later to remediate this issue. Patch status is not explicitly stated in the vendor advisory content provided, but the description confirms the fix in 0.9.7. Until upgraded, restrict network access to the relay-server WebSocket endpoints to trusted users only.
CVE-2026-42889: CWE-863: Incorrect Authorization in No-Instructions relay-server
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 v3.1
Score 9.1critical
Affected software
pkg:github/no-instructions/relay-serverRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
No-Instructions relay-server versions 0.9.0 to 0.9.6 contain an incorrect authorization vulnerability (CWE-863) in their multi-document WebSocket endpoints. When authentication is enabled, WebSocket connections missing a token query parameter are incorrectly treated as fully authorized, enabling unauthenticated attackers to access and modify document data by connecting to the document sync WebSocket with a known or guessed document ID. This flaw allows unauthorized read and write access to documents. The issue is resolved in relay-server version 0.9.7.
Potential Impact
An unauthenticated network attacker can bypass authentication controls and gain full read and write access to documents synchronized via the relay-server WebSocket endpoints. This compromises confidentiality and integrity of document contents. Availability is not impacted. The CVSS 3.1 base score is 9.1 (critical), reflecting network attack vector, no privileges required, no user interaction, and high impact on confidentiality and integrity.
Mitigation Recommendations
This vulnerability is fixed in No-Instructions relay-server version 0.9.7. Users should upgrade to version 0.9.7 or later to remediate this issue. Patch status is not explicitly stated in the vendor advisory content provided, but the description confirms the fix in 0.9.7. Until upgraded, restrict network access to the relay-server WebSocket endpoints to trusted users only.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-04-30T18:49:06.712Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a038bd7cbff5d8610164950
Added to database: 05/12/2026, 20:21:43 UTC
Last enriched: 05/12/2026, 20:37:00 UTC
Last updated: 07/07/2026, 10:33:23 UTC
Views: 70
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