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 87% 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 mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 8.8Exploit: None knownExposed services: Not assessed

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

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
8.8HIGHmedium confidence
EG Risk
40
EG Risk 40/100

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%
EPSS PROB
0.2%
EPSS %ILE
11th
KEV
Not listed

Published

July 3, 2026

Last Modified

July 7, 2026

Advisory Details (2)

Auto-updated Jul 3, 2026
No fix on record yet. 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
githubMentions a patch (unverified)

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 7× in last 7d / 26× 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.

Showing the most recent 100 of 126 total refreshes for this CVE.

  1. 2026-10-09 20:06 UTCEPSS rescore
  2. 2026-10-08 17:11 UTCEPSS rescore
  3. 2026-10-07 23:47 UTCEPSS rescore
  4. 2026-10-06 15:17 UTCEPSS rescore
  5. 2026-10-05 17:42 UTCEPSS rescore
  6. 2026-10-04 23:21 UTCEPSS rescore
  7. 2026-10-03 14:25 UTCEPSS rescore
  8. 2026-10-01 19:49 UTCEPSS rescore
  9. 2026-09-30 15:02 UTCEPSS rescore
  10. 2026-09-29 15:20 UTCEPSS rescore
  11. 2026-09-28 13:50 UTCEPSS rescore
  12. 2026-09-26 15:58 UTCEPSS rescore
  13. 2026-09-23 13:47 UTCEPSS rescore
  14. 2026-09-23 06:35 UTCEG score recompute
  15. 2026-09-20 20:15 UTCEPSS rescore
  16. 2026-09-18 19:27 UTCEPSS rescore
  17. 2026-09-18 06:12 UTCEG score recompute
  18. 2026-09-16 05:14 UTCEPSS rescore
  19. 2026-09-14 00:04 UTCEG score recompute
  20. 2026-09-13 16:46 UTCEPSS rescore
  21. 2026-09-13 08:56 UTCEG score recompute
  22. 2026-09-12 15:00 UTCEPSS rescore
  23. 2026-09-12 14:05 UTCEG score recompute
  24. 2026-09-11 14:52 UTCEPSS rescore
  25. 2026-09-11 09:36 UTCEPSS rescore
Show 75 more
  1. 2026-09-10 09:34 UTCEPSS rescore
  2. 2026-09-08 22:00 UTCEPSS rescore
  3. 2026-09-07 16:01 UTCEPSS rescore
  4. 2026-09-06 14:18 UTCEG score recompute
  5. 2026-09-06 13:47 UTCEPSS rescore
  6. 2026-09-05 23:48 UTCEG score recompute
  7. 2026-09-04 05:06 UTCEPSS rescore
  8. 2026-09-02 14:11 UTCEPSS rescore
  9. 2026-09-01 13:53 UTCEPSS rescore
  10. 2026-09-01 04:39 UTCEPSS rescore
  11. 2026-08-30 23:28 UTCEG score recompute
  12. 2026-08-30 19:17 UTCEPSS rescore
  13. 2026-08-30 11:19 UTCEG score recompute
  14. 2026-08-30 01:21 UTCEPSS rescore
  15. 2026-08-28 21:40 UTCEPSS rescore
  16. 2026-08-27 22:12 UTCEG score recompute
  17. 2026-08-27 14:24 UTCEPSS rescore
  18. 2026-08-27 03:13 UTCEG score recompute
  19. 2026-08-25 13:48 UTCEPSS rescore
  20. 2026-08-24 22:21 UTCEG score recompute
  21. 2026-08-24 10:12 UTCEG score recompute
  22. 2026-08-23 07:18 UTCEG score recompute
  23. 2026-08-23 00:19 UTCEPSS rescore
  24. 2026-08-22 05:57 UTCEG score recompute
  25. 2026-08-21 23:48 UTCEPSS rescore
  26. 2026-08-21 04:26 UTCEG score recompute
  27. 2026-08-20 22:55 UTCEPSS rescore
  28. 2026-08-20 03:55 UTCEG score recompute
  29. 2026-08-19 17:03 UTCEPSS rescore
  30. 2026-08-18 23:54 UTCEG score recompute
  31. 2026-08-18 13:48 UTCEPSS rescore
  32. 2026-08-17 22:48 UTCEG score recompute
  33. 2026-08-16 22:29 UTCEG score recompute
  34. 2026-08-16 14:56 UTCEPSS rescore
  35. 2026-08-16 10:19 UTCEG score recompute
  36. 2026-08-16 02:14 UTCEPSS rescore
  37. 2026-08-15 10:00 UTCEG score recompute
  38. 2026-08-15 01:30 UTCEPSS rescore
  39. 2026-08-14 09:41 UTCEG score recompute
  40. 2026-08-13 22:00 UTCEPSS rescore
  41. 2026-08-12 21:15 UTCEG score recompute
  42. 2026-08-12 13:50 UTCEPSS rescore
  43. 2026-08-11 08:48 UTCEG score recompute
  44. 2026-08-10 23:59 UTCEPSS rescore
  45. 2026-08-09 20:21 UTCEG score recompute
  46. 2026-08-09 13:46 UTCEPSS rescore
  47. 2026-08-08 20:03 UTCEG score recompute
  48. 2026-08-08 16:37 UTCEPSS rescore
  49. 2026-08-07 19:44 UTCEG score recompute
  50. 2026-08-06 19:26 UTCEG score recompute
  51. 2026-08-06 13:46 UTCEPSS rescore
  52. 2026-08-06 07:17 UTCEG score recompute
  53. 2026-08-05 19:17 UTCEPSS rescore
  54. 2026-08-04 16:36 UTCEG score recompute
  55. 2026-08-04 15:09 UTCEPSS rescore
  56. 2026-08-04 10:38 UTCEPSS rescore
  57. 2026-08-03 16:09 UTCEG score recompute
  58. 2026-08-03 10:35 UTCEPSS rescore
  59. 2026-08-02 03:39 UTCEG score recompute
  60. 2026-08-02 02:26 UTCEPSS rescore
  61. 2026-08-01 15:30 UTCEG score recompute
  62. 2026-08-01 04:15 UTCEPSS rescore
  63. 2026-07-31 03:01 UTCEG score recompute
  64. 2026-07-30 16:27 UTCEPSS rescore
  65. 2026-07-30 14:48 UTCEG score recompute
  66. 2026-07-30 02:21 UTCEG score recompute
  67. 2026-07-30 01:30 UTCEPSS rescore
  68. 2026-07-29 02:00 UTCEG score recompute
  69. 2026-07-28 15:36 UTCEPSS rescore
  70. 2026-07-28 01:30 UTCEG score recompute
  71. 2026-07-27 14:13 UTCEPSS rescore
  72. 2026-07-27 01:08 UTCEG score recompute
  73. 2026-07-26 14:54 UTCEPSS rescore
  74. 2026-07-26 14:54 UTCEPSS rescore
  75. 2026-07-26 12:58 UTCEG score recompute

Related CVEs(same CWE)

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 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 0.2% probability of exploitation in the next 30 days (11th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-10054?
CVE-2026-10054 has a CVSS base score of 8.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-10054?
No fix for CVE-2026-10054 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-10054

Explore →

Is Your Infrastructure Affected by CVE-2026-10054?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs