CVE-2026-10054

HIGHPre-NVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.8 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2%, top 88% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.8Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 header that an attacker can control or omit.

As a result, a foreign-origin web page visited by a user with a running Theia instance can open the /services WebSocket namespace, invoke terminal creation, attach to the resulting terminal data channel, execute arbitrary OS commands, and read their output. This affects both local developer setups (drive-by attack) and hosted or tunneled deployments without strong external authentication.

A fix is in development that enforces same-origin validation by default, removes trust in the fix-origin header, gates HTTP and WebSocket access on a SameSite=Strict; HttpOnly connection-token cookie, and sanitizes shell terminal creation options.

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
40(Track)
EG Risk 40/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity88% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
12%
KEV
Not listed

Published

July 3, 2026

Last Modified

July 7, 2026

Advisory Details (2)

Auto-updated Jul 3, 2026
Patch available. Sources: github.
generic

[Eclipse Theia] Cross-Origin WebSocket Access To Shell-Terminal Enables Command Execution And Output Exfiltration (#376) · Issues · Eclipse Projects Security / vulnerability-reports · GitLab

https://gitlab.eclipse.org/security/vulnerability-reports/-/work_items/376
github Patch Available

Cross-Origin WebSocket Access To Shell-Terminal Enables Command Execution And Output Exfiltration · Advisory · eclipse-theia/theia · GitHub

https://github.com/eclipse-theia/theia/security/advisories/GHSA-78g8-vm3p-97c6

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 12× in last 7d / 54× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-08-25 13:48 UTCEPSS rescore
  2. 2026-08-24 22:21 UTCEG score recompute
  3. 2026-08-24 10:12 UTCEG score recompute
  4. 2026-08-23 07:18 UTCEG score recompute
  5. 2026-08-23 00:19 UTCEPSS rescore
  6. 2026-08-22 05:57 UTCEG score recompute
  7. 2026-08-21 23:48 UTCEPSS rescore
  8. 2026-08-21 04:26 UTCEG score recompute
  9. 2026-08-20 22:55 UTCEPSS rescore
  10. 2026-08-20 03:55 UTCEG score recompute
  11. 2026-08-19 17:03 UTCEPSS rescore
  12. 2026-08-18 23:54 UTCEG score recompute
  13. 2026-08-18 13:48 UTCEPSS rescore
  14. 2026-08-17 22:48 UTCEG score recompute
  15. 2026-08-16 22:29 UTCEG score recompute
  16. 2026-08-16 14:56 UTCEPSS rescore
  17. 2026-08-16 10:19 UTCEG score recompute
  18. 2026-08-16 02:14 UTCEPSS rescore
  19. 2026-08-15 10:00 UTCEG score recompute
  20. 2026-08-15 01:30 UTCEPSS rescore
  21. 2026-08-14 09:41 UTCEG score recompute
  22. 2026-08-13 22:00 UTCEPSS rescore
  23. 2026-08-12 21:15 UTCEG score recompute
  24. 2026-08-12 13:50 UTCEPSS rescore
  25. 2026-08-11 08:48 UTCEG score recompute
Show 58 more
  1. 2026-08-10 23:59 UTCEPSS rescore
  2. 2026-08-09 20:21 UTCEG score recompute
  3. 2026-08-09 13:46 UTCEPSS rescore
  4. 2026-08-08 20:03 UTCEG score recompute
  5. 2026-08-08 16:37 UTCEPSS rescore
  6. 2026-08-07 19:44 UTCEG score recompute
  7. 2026-08-06 19:26 UTCEG score recompute
  8. 2026-08-06 13:46 UTCEPSS rescore
  9. 2026-08-06 07:17 UTCEG score recompute
  10. 2026-08-05 19:17 UTCEPSS rescore
  11. 2026-08-04 16:36 UTCEG score recompute
  12. 2026-08-04 15:09 UTCEPSS rescore
  13. 2026-08-04 10:38 UTCEPSS rescore
  14. 2026-08-03 16:09 UTCEG score recompute
  15. 2026-08-03 10:35 UTCEPSS rescore
  16. 2026-08-02 03:39 UTCEG score recompute
  17. 2026-08-02 02:26 UTCEPSS rescore
  18. 2026-08-01 15:30 UTCEG score recompute
  19. 2026-08-01 04:15 UTCEPSS rescore
  20. 2026-07-31 03:01 UTCEG score recompute
  21. 2026-07-30 16:27 UTCEPSS rescore
  22. 2026-07-30 14:48 UTCEG score recompute
  23. 2026-07-30 02:21 UTCEG score recompute
  24. 2026-07-30 01:30 UTCEPSS rescore
  25. 2026-07-29 02:00 UTCEG score recompute
  26. 2026-07-28 15:36 UTCEPSS rescore
  27. 2026-07-28 01:30 UTCEG score recompute
  28. 2026-07-27 14:13 UTCEPSS rescore
  29. 2026-07-27 01:08 UTCEG score recompute
  30. 2026-07-26 14:54 UTCEPSS rescore
  31. 2026-07-26 14:54 UTCEPSS rescore
  32. 2026-07-26 12:58 UTCEG score recompute
  33. 2026-07-25 14:17 UTCEPSS rescore
  34. 2026-07-24 14:17 UTCEPSS rescore
  35. 2026-07-23 14:18 UTCEPSS rescore
  36. 2026-07-23 03:04 UTCEG score recompute
  37. 2026-07-22 14:08 UTCEPSS rescore
  38. 2026-07-21 15:24 UTCEPSS rescore
  39. 2026-07-20 17:08 UTCEPSS rescore
  40. 2026-07-19 14:30 UTCEPSS rescore
  41. 2026-07-19 02:28 UTCEPSS rescore
  42. 2026-07-16 17:02 UTCEPSS rescore
  43. 2026-07-15 16:57 UTCEPSS rescore
  44. 2026-07-15 02:00 UTCEPSS rescore
  45. 2026-07-13 22:30 UTCEPSS rescore
  46. 2026-07-13 06:12 UTCEPSS rescore
  47. 2026-07-12 05:46 UTCEPSS rescore
  48. 2026-07-11 08:27 UTCEPSS rescore
  49. 2026-07-09 19:10 UTCEPSS rescore
  50. 2026-07-08 15:15 UTCEPSS rescore
  51. 2026-07-08 15:15 UTCEPSS rescore
  52. 2026-07-07 13:46 UTCEPSS rescore
  53. 2026-07-06 16:27 UTCEPSS rescore
  54. 2026-07-06 02:23 UTCEPSS rescore
  55. 2026-07-05 02:30 UTCEPSS rescore
  56. 2026-07-05 02:30 UTCEPSS rescore
  57. 2026-07-03 12:28 UTCEG score recompute
  58. 2026-07-03 12:26 UTCNVD updatefirst tracked

Frequently asked(5)

What is CVE-2026-10054?
CVE-2026-10054 is a high vulnerability published on July 3, 2026. 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 was CVE-2026-10054 disclosed?
CVE-2026-10054 was first published in the National Vulnerability Database on July 3, 2026, with the most recent update on July 7, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-10054 actively exploited?
CVE-2026-10054 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 87.8% of all scored CVEs.
What is the CVSS score of CVE-2026-10054?
CVE-2026-10054 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-10054?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-10054, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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