CVE-2026-61891

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-08-05. A secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
7.5EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 7.5Exploit: 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 Eclipse Theia versions up to and including 1.73.1, the @theia/filesystem backend exposes HTTP file-download endpoints (GET /file, GET /files/, PUT /files/) that convert a client-supplied URI directly to a filesystem path and stream the file, without confining it to the workspace or any allow-listed root. In browser (non-Electron) deployments the connection token is enforced only on WebSocket upgrades; the HTTP middleware in @theia/core re-issues the cookie and calls next() without rejecting tokenless HTTP requests, so these endpoints are reachable without a valid token. As a result an unauthenticated client can read any file readable by the backend process, including files outside the opened workspace (for example /etc/hosts, SSH keys, or tokens). Electron mode uses a separate ElectronSecurityToken and is not affected via this path.

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
49
EG Risk 49/100CISA SSVC

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
Severity75% × 45%
Exploitation1% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.
EPSS PROB
0.5%
EPSS %ILE
43rd
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 5, 2026

Last Modified

August 7, 2026

Advisory Details (2)

Auto-updated Aug 5, 2026
No patch confirmed yet.
generic

[Eclipse Theia] Arbitrary file read via file-download endpoints (no path containment) (#570) · Issues · Eclipse Projects Security / vulnerability-reports · GitLab

https://gitlab.eclipse.org/security/vulnerability-reports/-/issues/570
generic

[Eclipse Theia] Arbitrary file read via file-download endpoints (no path containment) (#176) · Issues · Eclipse Projects Security / cve-assignment · GitLab

https://gitlab.eclipse.org/security/cve-assignment/-/work_items/176

Vendor Advisories for CVE-2026-61891(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(4)

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

Data Freshness Timeline

(refreshed 19× in last 7d / 83× 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 196 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-61891?
CVE-2026-61891 is a high vulnerability published on August 5, 2026. In Eclipse Theia versions up to and including 1.73.1, the @theia/filesystem backend exposes HTTP file-download endpoints (GET /file, GET /files/, PUT /files/) that convert a client-supplied URI directly to a filesystem path and stream the file, without confining it to the workspace or any…
When was CVE-2026-61891 disclosed?
CVE-2026-61891 was first published on August 5, 2026, with the most recent update on August 7, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-61891 actively exploited?
CVE-2026-61891 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (43rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-61891?
CVE-2026-61891 has a CVSS base score of 7.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-61891?
No fix for CVE-2026-61891 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. The vendor advisories EchelonGraph has for CVE-2026-61891 are linked in the Vendor Advisories panel on this page.

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