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CVE-2026-10054

In affected versions of Eclipse Theia (1.8.1 and later), the browser backend exposes privileged terminal RPC over WebSocket (/services/shell-terminal, /services/terminals/:id) without service-level authentication. WebSocket origin validation in @theia/core is fail-open: connections are accepted when the Origin header is missing or when no THEIA_HOSTS allowlist is configured (the default). The Socket.IO integration additionally replaces the real Origin header with a client-supplied fix-origin
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:933cdd9be7bbd937d5a4735deade719dd4c4e6b3f83ac83cc287631374c56d42
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-1385","description":"CWE-1385 Missing origin validation in WebSockets","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:d72ff6f7f9e11ea7a2a8489e9277f5ed14a66f55be085f29800ace0015a8bf7e · sha256:2bd84e9928a4d710… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-306","description":"CWE-306 Missing authentication for critical function","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:d72ff6f7f9e11ea7a2a8489e9277f5ed14a66f55be085f29800ace0015a8bf7e · sha256:2bd84e9928a4d710… · /containers/cna/problemTypes/1/descriptions/0

Affected products and versions

1 source assertion
{"defaultStatus":"unaffected","product":"Eclipse Theia","vendor":"Eclipse Foundation","versions":[{"lessThan":"1.73.0","status":"affected","version":"1.8.1","versionType":"semver"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:d72ff6f7f9e11ea7a2a8489e9277f5ed14a66f55be085f29800ace0015a8bf7e · sha256:2bd84e9928a4d710… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":8.8,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:d72ff6f7f9e11ea7a2a8489e9277f5ed14a66f55be085f29800ace0015a8bf7e · sha256:2bd84e9928a4d710… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-1385","description":"CWE-1385 Missing origin validation in WebSockets","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:d72ff6f7f9e11ea7a2a8489e9277f5ed14a66f55be085f29800ace0015a8bf7e · sha256:2bd84e9928a4d710… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-306","description":"CWE-306 Missing authentication for critical function","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:d72ff6f7f9e11ea7a2a8489e9277f5ed14a66f55be085f29800ace0015a8bf7e · sha256:2bd84e9928a4d710… · /containers/cna/problemTypes/1/descriptions/0

Source references

2 source assertions
{"url":"https://github.com/eclipse-theia/theia/security/advisories/GHSA-78g8-vm3p-97c6"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d72ff6f7f9e11ea7a2a8489e9277f5ed14a66f55be085f29800ace0015a8bf7e · sha256:2bd84e9928a4d710… · /containers/cna/references/0
{"url":"https://gitlab.eclipse.org/security/vulnerability-reports/-/work_items/376"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d72ff6f7f9e11ea7a2a8489e9277f5ed14a66f55be085f29800ace0015a8bf7e · sha256:2bd84e9928a4d710… · /containers/cna/references/1

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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