CVE-2026-42889
Published: 12 May 2026
Summary
CVE-2026-42889 is a critical-severity Authorization Bypass Through User-Controlled Key (CWE-639) vulnerability. Its CVSS base score is 9.1 (Critical).
Operationally, it is not currently listed in the CISA KEV catalog.
Threat & Defense Details
Likely Mitigating ControlsAI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Applying decisions to each request prior to enforcement mitigates incorrect authorization by enforcing consistent policy evaluation.
Mandating policy-based enforcement reduces the chance of incorrect authorization logic being used.
Periodic review and update of procedures reduces incorrect authorization implementations over time.
Supervision identifies cases where authorization logic incorrectly permits unauthorized actions.
Defining permitted attribute values and auditing modifications reduces the chance of incorrect authorization outcomes due to tampered or missing labels.
The authorization process and usage restrictions help prevent incorrect authorization for remote access types.
Establishing configuration and connection requirements helps ensure correct rather than incorrect authorization for wireless access.
Establishing connection authorization processes for mobile devices helps ensure authorization decisions are correctly implemented rather than incorrect.
NVD 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.…
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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.
Deeper analysisAI
Automated synthesis unavailable for this CVE.
Details
- CWE(s)