CVE-2026-63223

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.8%, top 46% 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, secondary
Elevated
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.8Exploit: Elevated riskExposed: 0

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

CodeIgniter is a PHP full-stack web framework. Prior to 4.7.4, the is_image and mime_in upload validation rules do not independently enforce a safe client filename extension, allowing a remote attacker to upload executable content when an application preserves the client filename and stores uploads in a web-accessible script-enabled directory. Applications are impacted when they validate uploads using is_image or mime_in without an independent safe extension check (such as ext_in on patched versions), save uploaded files using the client-supplied filename, and place uploads in a web-accessible directory where PHP files can execute. This issue is fixed in version 4.7.4.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
75(Track)
EG Risk 75/100SSVC: 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
Severity98% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
54%
KEV
Not listed

Published

July 31, 2026

Last Modified

September 8, 2026

Advisory Details (3)

Auto-updated Sep 16, 2026
Patch available. Sources: github_commit, github_release, github.
github Patch Available

Uploaded file extension validation bypass in `is_image` and `mime_in` rules · Advisory · codeigniter4/CodeIgniter4 · GitHub

https://github.com/codeigniter4/CodeIgniter4/security/advisories/GHSA-mmj4-63m4-r6h5
github_release Patch Available

CodeIgniter 4.7.4

Patch available: codeigniter4/CodeIgniter4 v4.7.4

https://github.com/codeigniter4/CodeIgniter4/releases/tag/v4.7.4
github_commit Patch Available

commit b6e9a4fa1dca (codeigniter4/CodeIgniter4)

Patch available: codeigniter4/CodeIgniter4 v4.7.4 (contains commit b6e9a4fa1dca)

https://github.com/codeigniter4/CodeIgniter4/commit/b6e9a4fa1dca2df3d3f261bdf61532df8c6420aa

Vendor Advisories for CVE-2026-63223(1)

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

Affected Packages

(1 across 1 ecosystem)
Packagist(1)
PackageVulnerable rangeFixed inDependents
codeigniter4/framework4.0.0 ... v4.7.3 (78 versions)4.7.4—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 10× in last 7d / 51× 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. 2026-09-18 22:25 UTCEG score recompute
  2. 2026-09-18 19:28 UTCEPSS rescore
  3. 2026-09-18 01:17 UTCEG score recompute
  4. 2026-09-17 01:25 UTCEG score recompute
  5. 2026-09-16 14:08 UTCEPSS rescore
  6. 2026-09-16 05:31 UTCEG score recompute
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  8. 2026-09-15 07:07 UTCEG score recompute
  9. 2026-09-13 19:42 UTCEG score recompute
  10. 2026-09-12 16:05 UTCEG score recompute
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  12. 2026-09-11 14:53 UTCEPSS rescore
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  14. 2026-09-10 12:56 UTCEG score recompute
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  25. 2026-09-04 05:07 UTCEPSS rescore
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  1. 2026-09-03 09:17 UTCEG score recompute
  2. 2026-09-02 14:12 UTCEPSS rescore
  3. 2026-09-01 22:35 UTCEG score recompute
  4. 2026-09-01 13:54 UTCEPSS rescore
  5. 2026-09-01 07:26 UTCEG score recompute
  6. 2026-09-01 04:40 UTCEPSS rescore
  7. 2026-08-30 21:24 UTCEG score recompute
  8. 2026-08-30 19:17 UTCEPSS rescore
  9. 2026-08-30 02:06 UTCEG score recompute
  10. 2026-08-30 01:22 UTCEPSS rescore
  11. 2026-08-29 22:26 UTCEG score recompute
  12. 2026-08-28 21:42 UTCEPSS rescore
  13. 2026-08-27 20:47 UTCEG score recompute
  14. 2026-08-27 14:25 UTCEPSS rescore
  15. 2026-08-26 19:16 UTCEG score recompute
  16. 2026-08-26 14:46 UTCEPSS rescore
  17. 2026-08-25 16:08 UTCEG score recompute
  18. 2026-08-25 13:49 UTCEPSS rescore
  19. 2026-08-24 17:54 UTCEG score recompute
  20. 2026-08-24 10:32 UTCEG score recompute
  21. 2026-08-23 01:20 UTCEG score recompute
  22. 2026-08-23 00:19 UTCEPSS rescore
  23. 2026-08-22 03:13 UTCEG score recompute
  24. 2026-08-21 23:49 UTCEPSS rescore
  25. 2026-08-21 01:23 UTCEG score recompute
  26. 2026-08-20 22:55 UTCEPSS rescore
  27. 2026-08-19 19:27 UTCEG score recompute
  28. 2026-08-19 17:04 UTCEPSS rescore
  29. 2026-08-18 15:51 UTCEG score recompute
  30. 2026-08-18 13:48 UTCEPSS rescore
  31. 2026-08-17 13:59 UTCEG score recompute
  32. 2026-08-17 13:47 UTCEPSS rescore
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  34. 2026-08-16 14:56 UTCEPSS rescore
  35. 2026-08-16 04:57 UTCEG score recompute
  36. 2026-08-15 03:11 UTCEG score recompute
  37. 2026-08-15 01:30 UTCEPSS rescore
  38. 2026-08-14 01:30 UTCEG score recompute
  39. 2026-08-13 22:00 UTCEPSS rescore
  40. 2026-08-12 16:22 UTCEG score recompute
  41. 2026-08-12 13:51 UTCEPSS rescore
  42. 2026-08-11 14:40 UTCEG score recompute
  43. 2026-08-11 03:38 UTCEG score recompute
  44. 2026-08-11 00:00 UTCEPSS rescore
  45. 2026-08-09 14:49 UTCEG score recompute
  46. 2026-08-09 13:47 UTCEPSS rescore
  47. 2026-08-08 16:48 UTCEG score recompute
  48. 2026-08-08 16:37 UTCEPSS rescore
  49. 2026-08-07 18:48 UTCEG score recompute
  50. 2026-08-06 17:06 UTCEG score recompute
  51. 2026-08-06 13:47 UTCEPSS rescore
  52. 2026-08-05 22:43 UTCEG score recompute
  53. 2026-08-05 19:17 UTCEPSS rescore
  54. 2026-08-05 19:17 UTCEPSS rescore
  55. 2026-08-04 17:16 UTCEG score recompute
  56. 2026-08-04 15:10 UTCEPSS rescore
  57. 2026-08-04 13:35 UTCEG score recompute
  58. 2026-08-04 10:39 UTCEPSS rescore
  59. 2026-08-03 11:22 UTCEG score recompute
  60. 2026-08-03 10:36 UTCEPSS rescore
  61. 2026-08-02 05:57 UTCEG score recompute
  62. 2026-08-02 02:27 UTCEPSS rescore
  63. 2026-08-01 07:55 UTCEG score recompute
  64. 2026-08-01 04:16 UTCEPSS rescore
  65. 2026-08-01 00:34 UTCEG score recompute
  66. 2026-07-31 23:40 UTCEG score recompute
  67. 2026-07-31 06:22 UTCEG score recompute
  68. 2026-07-31 05:18 UTCEG score recompute
  69. 2026-07-31 05:18 UTCMITRE cvelistV5first tracked

Publicly available exploits

(2 references)

Working exploit code is in the public domain (2 GitHub PoCs). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCshinthink/CVE-2026-63223
    First seen Aug 4, 2026

    CVE-2026-63223 — CI4RCE: CodeIgniter 4 is_image/mime_in File Upload RCE. Magic bytes bypass (getExtension vs getClientExtension). CVSS 9.8 | CWE-434 | CI4 < 4.7.4

    Open source ↗
  • GitHub PoCimbas007/CVE-2026-63223-POC
    First seen Aug 3, 2026

    CVE-2026-63223 PoC — CodeIgniter 4 is_image/mime_in File Upload RCE (CVSS 9.8). Unauthenticated remote code execution via unrestricted file upload bypass using image magic bytes. Fixed in v4.7.4.

    Open source ↗

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-63223?
CVE-2026-63223 is a critical vulnerability published on July 31, 2026. CodeIgniter is a PHP full-stack web framework. Prior to 4.7.4, the isimage and mimein upload validation rules do not independently enforce a safe client filename extension, allowing a remote attacker to upload executable content when an application preserves the client filename and stores uploads…
When was CVE-2026-63223 disclosed?
CVE-2026-63223 was first published in the National Vulnerability Database on July 31, 2026, with the most recent update on September 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-63223 actively exploited?
CVE-2026-63223 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 46.3% of all scored CVEs.
What is the CVSS score of CVE-2026-63223?
CVE-2026-63223 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-63223?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-63223, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-63223

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