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CVE-2026-42889

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.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:48eabaa979cfddedbea8c2cd47de8f95b875c722f893af95ef79d2254aeb4afc
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-863","description":"CWE-863: Incorrect Authorization","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:ed8cdea866db99d44a1c7e1fa39097ce2fa8f0365a2571774fcede9a4a8339a6 · sha256:89e8d639db13fdca… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-639","description":"CWE-639: Authorization Bypass Through User-Controlled Key","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:ed8cdea866db99d44a1c7e1fa39097ce2fa8f0365a2571774fcede9a4a8339a6 · sha256:89e8d639db13fdca… · /containers/cna/problemTypes/1/descriptions/0

Affected products and versions

1 source assertion
{"product":"relay-server","vendor":"No-Instructions","versions":[{"status":"affected","version":">= 0.9.0, < 0.9.7"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:ed8cdea866db99d44a1c7e1fa39097ce2fa8f0365a2571774fcede9a4a8339a6 · sha256:89e8d639db13fdca… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":9.1,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:ed8cdea866db99d44a1c7e1fa39097ce2fa8f0365a2571774fcede9a4a8339a6 · sha256:89e8d639db13fdca… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-863","description":"CWE-863: Incorrect Authorization","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:ed8cdea866db99d44a1c7e1fa39097ce2fa8f0365a2571774fcede9a4a8339a6 · sha256:89e8d639db13fdca… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-639","description":"CWE-639: Authorization Bypass Through User-Controlled Key","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:ed8cdea866db99d44a1c7e1fa39097ce2fa8f0365a2571774fcede9a4a8339a6 · sha256:89e8d639db13fdca… · /containers/cna/problemTypes/1/descriptions/0

Source references

2 source assertions
{"name":"https://github.com/No-Instructions/relay-server/security/advisories/GHSA-9vp9-8q9j-8mqm","tags":["x_refsource_CONFIRM"],"url":"https://github.com/No-Instructions/relay-server/security/advisories/GHSA-9vp9-8q9j-8mqm"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:ed8cdea866db99d44a1c7e1fa39097ce2fa8f0365a2571774fcede9a4a8339a6 · sha256:89e8d639db13fdca… · /containers/cna/references/0
{"tags":["exploit"],"url":"https://github.com/No-Instructions/relay-server/security/advisories/GHSA-9vp9-8q9j-8mqm"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:ed8cdea866db99d44a1c7e1fa39097ce2fa8f0365a2571774fcede9a4a8339a6 · sha256:89e8d639db13fdca… · /containers/adp/0/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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