CVE-2026-61891

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH 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(high)
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
38%
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 28× in last 7d / 65× 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. 2026-08-21 00:24 UTCEG score recompute
  2. 2026-08-21 00:24 UTCGHSA enrichment
  3. 2026-08-20 22:55 UTCEPSS rescore
  4. 2026-08-20 12:06 UTCGHSA enrichment
  5. 2026-08-19 23:40 UTCEG score recompute
  6. 2026-08-19 23:40 UTCGHSA enrichment
  7. 2026-08-19 17:04 UTCEPSS rescore
  8. 2026-08-19 11:21 UTCGHSA enrichment
  9. 2026-08-18 23:03 UTCEG score recompute
  10. 2026-08-18 23:03 UTCGHSA enrichment
  11. 2026-08-18 13:48 UTCEPSS rescore
  12. 2026-08-18 10:45 UTCGHSA enrichment
  13. 2026-08-17 22:26 UTCEG score recompute
  14. 2026-08-17 22:26 UTCGHSA enrichment
  15. 2026-08-17 13:47 UTCEPSS rescore
  16. 2026-08-17 10:02 UTCGHSA enrichment
  17. 2026-08-16 21:44 UTCEG score recompute
  18. 2026-08-16 21:44 UTCGHSA enrichment
  19. 2026-08-16 14:56 UTCEPSS rescore
  20. 2026-08-16 09:25 UTCEG score recompute
  21. 2026-08-16 09:25 UTCGHSA enrichment
  22. 2026-08-15 21:07 UTCGHSA enrichment
  23. 2026-08-15 08:48 UTCEG score recompute
  24. 2026-08-15 08:48 UTCGHSA enrichment
  25. 2026-08-15 01:30 UTCEPSS rescore
Show 40 more
  1. 2026-08-14 20:29 UTCGHSA enrichment
  2. 2026-08-14 08:07 UTCEG score recompute
  3. 2026-08-14 08:07 UTCGHSA enrichment
  4. 2026-08-13 22:00 UTCEPSS rescore
  5. 2026-08-13 19:48 UTCGHSA enrichment
  6. 2026-08-13 07:30 UTCGHSA enrichment
  7. 2026-08-12 19:11 UTCEG score recompute
  8. 2026-08-12 19:11 UTCGHSA enrichment
  9. 2026-08-12 13:51 UTCEPSS rescore
  10. 2026-08-12 06:53 UTCGHSA enrichment
  11. 2026-08-11 18:34 UTCEG score recompute
  12. 2026-08-11 18:34 UTCGHSA enrichment
  13. 2026-08-11 06:16 UTCEG score recompute
  14. 2026-08-11 06:15 UTCGHSA enrichment
  15. 2026-08-11 00:00 UTCEPSS rescore
  16. 2026-08-10 17:57 UTCGHSA enrichment
  17. 2026-08-10 05:24 UTCGHSA enrichment
  18. 2026-08-09 17:05 UTCEG score recompute
  19. 2026-08-09 17:05 UTCGHSA enrichment
  20. 2026-08-09 13:47 UTCEPSS rescore
  21. 2026-08-09 04:47 UTCEG score recompute
  22. 2026-08-09 04:47 UTCGHSA enrichment
  23. 2026-08-08 16:37 UTCEPSS rescore
  24. 2026-08-08 16:29 UTCGHSA enrichment
  25. 2026-08-08 04:10 UTCEG score recompute
  26. 2026-08-08 04:10 UTCGHSA enrichment
  27. 2026-08-07 15:51 UTCGHSA enrichment
  28. 2026-08-07 04:08 UTCGHSA enrichment
  29. 2026-08-06 15:49 UTCGHSA enrichment
  30. 2026-08-06 14:06 UTCEG score recompute
  31. 2026-08-06 14:06 UTCGHSA enrichment
  32. 2026-08-06 13:47 UTCEPSS rescore
  33. 2026-08-06 01:47 UTCGHSA enrichment
  34. 2026-08-05 13:28 UTCEG score recompute
  35. 2026-08-05 13:28 UTCGHSA enrichment
  36. 2026-08-05 13:08 UTCEG score recompute
  37. 2026-08-05 13:08 UTCGHSA enrichment
  38. 2026-08-05 12:25 UTCEG score recompute
  39. 2026-08-05 11:48 UTCEG score recompute
  40. 2026-08-05 11:47 UTCMITRE cvelistV5first tracked

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 62.3% 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.

Dependency Blast Radius

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