CVE-2026-41203

CRITICALNVD 9.49.4—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.4 under NVD CVSS v3. EPSS exploit probability: 0.5%, top 62% 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
Elevated
9.4
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.4Exploit: NoneExposed: 0

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

CI4MS is a CodeIgniter 4-based CMS skeleton that delivers a production-ready, modular architecture with RBAC authorization and theme support. Prior to version 0.31.5.0, ci4ms Theme::upload extracts user uploaded ZIP archives without validating entry names, allowing an authenticated backend user with the theme create permission to write files to arbitrary filesystem locations (Zip Slip) and achieve remote code execution by dropping a PHP file under the public web root. This issue has been patched in version 0.31.5.0.

CVSS v3
9.4
EG Score
9.4(medium)
EPSS
38.3%
KEV
Not listed

Published

May 7, 2026

Last Modified

May 7, 2026

Advisory Details (2)

Auto-updated May 7, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

ci4ms Theme::upload is vulnerable to Zip Slip leading to RCE · Advisory · ci4-cms-erp/ci4ms · GitHub

https://github.com/ci4-cms-erp/ci4ms/security/advisories/GHSA-xv3r-vr59-95rg
generic

Release Release v0.31.5.0 · ci4-cms-erp/ci4ms · GitHub

https://github.com/ci4-cms-erp/ci4ms/releases/tag/0.31.5.0

Affected Packages

(1 across 1 ecosystem)
Packagist(1)
PackageVulnerable rangeFixed inDependents
ci4-cms-erp/ci4ms0.21.0 ... 0.31.4.0 (52 versions)0.31.5.0—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 6× in last 7d / 46× 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 149 total refreshes for this CVE.

  1. 2026-07-11 08:27 UTCEPSS rescore
  2. 2026-07-09 19:10 UTCEPSS rescore
  3. 2026-07-08 15:15 UTCEPSS rescore
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  14. 2026-06-27 14:44 UTCEG score recompute
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  1. 2026-06-19 19:25 UTCEPSS rescore
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  7. 2026-06-15 08:05 UTCEG score recompute
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  9. 2026-06-14 23:40 UTCEG score recompute
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  18. 2026-06-12 22:02 UTCEG score recompute
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  20. 2026-06-12 09:05 UTCEG score recompute
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  22. 2026-06-12 01:15 UTCEG score recompute
  23. 2026-06-11 21:23 UTCEG score recompute
  24. 2026-06-11 17:31 UTCEG score recompute
  25. 2026-06-11 14:00 UTCEPSS rescore
  26. 2026-06-11 13:38 UTCEG score recompute
  27. 2026-06-11 09:46 UTCEG score recompute
  28. 2026-06-11 05:53 UTCEG score recompute
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  30. 2026-06-10 22:18 UTCEPSS rescore
  31. 2026-06-10 22:09 UTCEG score recompute
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  34. 2026-06-10 13:22 UTCEPSS rescore
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  36. 2026-06-10 10:33 UTCEG score recompute
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  38. 2026-06-10 02:48 UTCEG score recompute
  39. 2026-06-09 22:56 UTCEG score recompute
  40. 2026-06-09 17:56 UTCEG score recompute
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  42. 2026-06-09 10:12 UTCEG score recompute
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  46. 2026-06-08 14:17 UTCEPSS rescore
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  48. 2026-06-08 12:08 UTCEG score recompute
  49. 2026-06-08 08:16 UTCEG score recompute
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  52. 2026-06-07 20:38 UTCEG score recompute
  53. 2026-06-07 16:46 UTCEG score recompute
  54. 2026-06-07 15:25 UTCEPSS rescore
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  56. 2026-06-07 12:52 UTCEG score recompute
  57. 2026-06-07 09:00 UTCEG score recompute
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  59. 2026-06-07 01:16 UTCEG score recompute
  60. 2026-06-06 21:24 UTCEG score recompute
  61. 2026-06-06 17:32 UTCEG score recompute
  62. 2026-06-06 13:47 UTCEPSS rescore
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  64. 2026-06-06 13:38 UTCEG score recompute
  65. 2026-06-06 09:46 UTCEG score recompute
  66. 2026-06-06 05:53 UTCEG score recompute
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  68. 2026-06-05 22:47 UTCEPSS rescore
  69. 2026-06-05 21:50 UTCEG score recompute
  70. 2026-06-05 17:57 UTCEG score recompute
  71. 2026-06-05 14:05 UTCEG score recompute
  72. 2026-06-05 10:11 UTCEG score recompute
  73. 2026-06-05 06:19 UTCEG score recompute
  74. 2026-06-05 06:10 UTCEPSS rescore
  75. 2026-06-05 06:10 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-41203?
CVE-2026-41203 is a critical vulnerability published on May 7, 2026. CI4MS is a CodeIgniter 4-based CMS skeleton that delivers a production-ready, modular architecture with RBAC authorization and theme support. Prior to version 0.31.5.0, ci4ms Theme::upload extracts user uploaded ZIP archives without validating entry names, allowing an authenticated backend user…
When was CVE-2026-41203 disclosed?
CVE-2026-41203 was first published in the National Vulnerability Database on May 7, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-41203 actively exploited?
CVE-2026-41203 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 38.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-41203?
CVE-2026-41203 has a CVSS v3 base score of 9.4 (NVD).
How do I remediate CVE-2026-41203?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-41203, 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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