Is CVE-2026-42889 actively exploited?

No active exploitation of CVE-2026-42889 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-42889 be exploited remotely?

Yes. CVE-2026-42889 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-42889?

CVE-2026-42889 has a CVSS score of 9.1 (CRITICAL).

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CRITICAL

CVE-2026-42889

CWE-639Published: May 12, 2026· Updated: May 13, 2026

9.1

CVSS v3.1

EPSS:0.04%probability of exploitation in 30 daysPercentile:13.0th

Official 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.

NVD Source

Technical Analysis

CVE-2026-42889 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), with a CVSS base score of 9.1.