CVE-2026-42889

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Source

https://cve.org/CVERecord?id=CVE-2026-42889

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-42889.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-42889

Aliases

GHSA-9vp9-8q9j-8mqm

Published

2026-05-12T19:30:05.552Z

Modified

2026-07-15T01:48:53.551196787Z

Severity

9.1 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N CVSS Calculator

Summary

Relay Server WebSocket authentication bypass when token is omitted

Details

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.

Database specific

{
    "cwe_ids": [
        "CWE-639",
        "CWE-863"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42889.json",
    "cna_assigner": "GitHub_M"
}

References

Affected packages

Git / github.com/no-instructions/relay-server

Affected ranges

Type

GIT

Repo

https://github.com/no-instructions/relay-server

Events

Introduced

bc24089391fab62a67d43b9081c22faed7e2b9cd

Fixed

b15b026bf8a230e12f23ad1d1b48dc0d53ce010f

Database specific

{
    "source": [
        "AFFECTED_FIELD",
        "DESCRIPTION"
    ],
    "extracted_events": [
        {
            "introduced": "0.9.0"
        },
        {
            "fixed": "0.9.7"
        },
        {
            "fixed": "0.9.6"
        }
    ]
}

Affected versions

0.*

0.9.0

0.9.1

0.9.2

0.9.3

0.9.4

0.9.5

0.9.6

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-42889.json"