CVE-2026-35603

HIGHNVD 7.37.3—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.3 under NVD CVSS v3. EPSS exploit probability: 0.1%, top 99% 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, nvd
7.3EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.3Exploit: None knownExposed: 0

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

Claude Code is an agentic coding tool. In versions prior to 2.1.75 on Windows, Claude Code loaded the system-wide default configuration from C:\ProgramData\ClaudeCode\managed-settings.json without validating directory ownership or access permissions. Because the ProgramData directory is writable by non-administrative users by default and the ClaudeCode subdirectory was not pre-created or access-restricted, a low-privileged local user could create this directory and place a malicious configuration file that would be automatically loaded for any user launching Claude Code on the same machine. Exploiting this would have required a shared multi-user Windows system and a victim user to launch Claude Code after the malicious configuration was placed. This issue has been fixed on version 2.1.75.

CVSS v3
7.3
EG Score
7.3(medium)
EG Risk
33(Track)
EG Risk 33/100SSVC: 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
Severity73% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
1%
KEV
Not listed

Published

April 17, 2026

Last Modified

April 22, 2026

Advisory Details (1)

Auto-updated Jun 14, 2026
Patch available. Sources: github.
github Patch Available

Insecure System-Wide Configuration Loading Enables Local Privilege Escalation on Windows · Advisory · anthropics/claude-code · GitHub

https://github.com/anthropics/claude-code/security/advisories/GHSA-5cwg-9f6j-9jvx

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFixed inDependents
@anthropic-ai/claude-code—2.1.75—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 6× in last 7d / 25× 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 139 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-35603?
CVE-2026-35603 is a high vulnerability published on April 17, 2026. Claude Code is an agentic coding tool. In versions prior to 2.1.75 on Windows, Claude Code loaded the system-wide default configuration from C:\ProgramData\ClaudeCode\managed-settings.json without validating directory ownership or access permissions. Because the ProgramData directory is writable by…
When was CVE-2026-35603 disclosed?
CVE-2026-35603 was first published in the National Vulnerability Database on April 17, 2026, with the most recent update on April 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-35603 actively exploited?
CVE-2026-35603 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 98.7% of all scored CVEs.
What is the CVSS score of CVE-2026-35603?
CVE-2026-35603 has a CVSS v3 base score of 7.3 (NVD).
How do I remediate CVE-2026-35603?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-35603, 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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