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 a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: None knownExposed: 0

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

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
7.5(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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
Severity75% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
39%
KEV
Not listed

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 21× in last 7d / 96× 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 157 total refreshes for this CVE.

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

Related CVEs(same CWE)

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 in the National Vulnerability Database 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% probability of exploitation in the next 30 days, which ranks it in the top 61.5% of all scored CVEs.
What is the CVSS score of CVE-2026-61891?
CVE-2026-61891 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-61891?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-61891, 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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