CVE-2026-10054
Unauthenticated remote command execution via Theia terminal WebSocket.
Is CVE-2026-10054 being exploited?
Not confirmed. CVE-2026-10054 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.22% probability of exploitation in the next 30 days.
How severe is CVE-2026-10054?
CVE-2026-10054 is rated High with a CVSS score of 8.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-10054?
Yes. A fix has been recorded for CVE-2026-10054. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-10054 affect?
CVE-2026-10054 affects Eclipse Theia 1.8.1+ Web backend, Theia IDE deployments (self-hosted). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-10054?
Monitor for patch; implement same-origin checks and access controls when available.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote code execution via unauthenticated Theia WebSocket terminal; attacker can run OS commands and read output.
Monitor only
- affected>= 1.8.1 and < 1.73.0
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.