CVE-2026-12609

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 1.66.0 and up until including 1.73.1, the @theia/plugin-ext backend exposes the /hostedPlugin/:pluginId/:path(*) HTTP endpoint, which resolves the requested file path with path.resolve(localPath, filePath) without verifying that the resolved path stays within the plugin's directory. An unauthenticated network attacker can send percent-encoded ../ sequences (%2e%2e%2f) that decode into the path parameter and escape the plugin directory, allowing arbitrary files readable by the Theia backend process to be retrieved. Plugin IDs are derived deterministically from a plugin's publisher and name, so built-in plugins serve as reliable anchors that require no prior knowledge of the target system.

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
34%
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] @theia/plugin-ext: Unauthenticated Path Traversal Allows Arbitrary File Read via /hostedPlugin Endpoint (#133) · Issues · Eclipse Projects Security / cve-assignment · GitLab

https://gitlab.eclipse.org/security/cve-assignment/-/work_items/133
generic

[Eclipse Theia] @theia/plugin-ext: Unauthenticated Path Traversal Allows Arbitrary File Read via /hostedPlugin Endpoint (#524) · Issues · Eclipse Projects Security / vulnerability-reports · GitLab

https://gitlab.eclipse.org/security/vulnerability-reports/-/issues/524

Vendor Advisories for CVE-2026-12609(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 26× in last 7d / 64× 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. 2026-08-20 22:55 UTCEPSS rescore
  2. 2026-08-20 20:43 UTCGHSA enrichment
  3. 2026-08-20 07:48 UTCGHSA enrichment
  4. 2026-08-19 18:53 UTCEG score recompute
  5. 2026-08-19 18:53 UTCGHSA enrichment
  6. 2026-08-19 17:03 UTCEPSS rescore
  7. 2026-08-19 04:42 UTCGHSA enrichment
  8. 2026-08-18 15:46 UTCEG score recompute
  9. 2026-08-18 15:46 UTCGHSA enrichment
  10. 2026-08-18 13:48 UTCEPSS rescore
  11. 2026-08-18 01:50 UTCEG score recompute
  12. 2026-08-18 01:50 UTCGHSA enrichment
  13. 2026-08-17 12:54 UTCGHSA enrichment
  14. 2026-08-17 00:00 UTCEG score recompute
  15. 2026-08-17 00:00 UTCGHSA enrichment
  16. 2026-08-16 14:56 UTCEPSS rescore
  17. 2026-08-16 11:05 UTCEG score recompute
  18. 2026-08-16 11:05 UTCGHSA enrichment
  19. 2026-08-16 02:14 UTCEPSS rescore
  20. 2026-08-15 22:11 UTCGHSA enrichment
  21. 2026-08-15 09:16 UTCEG score recompute
  22. 2026-08-15 09:16 UTCGHSA enrichment
  23. 2026-08-15 01:30 UTCEPSS rescore
  24. 2026-08-14 20:21 UTCGHSA enrichment
  25. 2026-08-14 07:27 UTCEG score recompute
Show 39 more
  1. 2026-08-14 07:27 UTCGHSA enrichment
  2. 2026-08-13 22:00 UTCEPSS rescore
  3. 2026-08-13 18:32 UTCGHSA enrichment
  4. 2026-08-13 05:37 UTCGHSA enrichment
  5. 2026-08-12 16:42 UTCEG score recompute
  6. 2026-08-12 16:42 UTCGHSA enrichment
  7. 2026-08-12 13:50 UTCEPSS rescore
  8. 2026-08-12 03:48 UTCGHSA enrichment
  9. 2026-08-11 14:53 UTCEG score recompute
  10. 2026-08-11 14:53 UTCGHSA enrichment
  11. 2026-08-11 13:42 UTCEPSS rescore
  12. 2026-08-11 01:58 UTCEG score recompute
  13. 2026-08-11 01:58 UTCGHSA enrichment
  14. 2026-08-10 23:59 UTCEPSS rescore
  15. 2026-08-10 13:04 UTCGHSA enrichment
  16. 2026-08-10 00:08 UTCEG score recompute
  17. 2026-08-10 00:08 UTCGHSA enrichment
  18. 2026-08-09 13:46 UTCEPSS rescore
  19. 2026-08-09 11:14 UTCGHSA enrichment
  20. 2026-08-08 22:19 UTCEG score recompute
  21. 2026-08-08 22:19 UTCGHSA enrichment
  22. 2026-08-08 16:37 UTCEPSS rescore
  23. 2026-08-08 09:24 UTCGHSA enrichment
  24. 2026-08-07 20:30 UTCGHSA enrichment
  25. 2026-08-07 17:39 UTCEG score recompute
  26. 2026-08-07 17:39 UTCGHSA enrichment
  27. 2026-08-07 04:44 UTCGHSA enrichment
  28. 2026-08-06 15:49 UTCGHSA enrichment
  29. 2026-08-06 15:18 UTCEG score recompute
  30. 2026-08-06 15:18 UTCGHSA enrichment
  31. 2026-08-06 13:46 UTCEPSS rescore
  32. 2026-08-06 02:23 UTCGHSA enrichment
  33. 2026-08-05 13:29 UTCEG score recompute
  34. 2026-08-05 13:29 UTCGHSA enrichment
  35. 2026-08-05 13:10 UTCEG score recompute
  36. 2026-08-05 13:09 UTCGHSA enrichment
  37. 2026-08-05 11:27 UTCEG score recompute
  38. 2026-08-05 11:07 UTCEG score recompute
  39. 2026-08-05 11:05 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-12609?
CVE-2026-12609 is a high vulnerability published on August 5, 2026. In Eclipse Theia versions 1.66.0 and up until including 1.73.1, the @theia/plugin-ext backend exposes the /hostedPlugin/:pluginId/:path(*) HTTP endpoint, which resolves the requested file path with path.resolve(localPath, filePath) without verifying that the resolved path stays within the plugin's…
When was CVE-2026-12609 disclosed?
CVE-2026-12609 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-2026-12609 actively exploited?
CVE-2026-12609 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 65.7% of all scored CVEs.
What is the CVSS score of CVE-2026-12609?
CVE-2026-12609 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-12609?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-12609, 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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