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CVE-2026-63223— CodeIgniter: Uploaded file extension validation bypass in is_image and mime_in rules

Quick assessment

Affected
codeigniter4 CodeIgniter4
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

CodeIgniter 是一个 PHP 全栈 Web 框架。在 4.7.4 版本之前， 和 文件上传验证规则并未独立强制要求安全的客户端文件名扩展名，这可能导致远程攻击者在应用程序保留客户端文件名并将上传文件存储在支持脚本执行的 Web 可访问目录时，上传可执行内容。 当应用程序同时满足以下条件时，将受到该漏洞影响： 1. 使用 或 验证上传文件； 2. 未辅以独立的扩展名安全检查（例如在补丁版本中提供的 规则）； 3. 使用客户端提供的文件名保存上传文件； 4. 将上传文件存放于支持 PHP 文件执行的 Web

CVSS 9.8 · Critical EPSS 0.80% · P55

Possible ATT&CK Techniques 1 AI

T1505.003 · Web Shell

Affected Version Matrix 1

VendorProduct Version RangeStatus
codeigniter4 CodeIgniter4 < 4.7.4 affected
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I. Basic Information for CVE-2026-63223

Vulnerability Information
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Vulnerability Title
CodeIgniter: Uploaded file extension validation bypass in is_image and mime_in rules
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
危险类型文件的不加限制上传
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
codeigniter4 CodeIgniter4 < 4.7.4 -

II. Public POCs for CVE-2026-63223

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 6865 chars
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III. Intelligence Information for CVE-2026-63223

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Patches & Fixes for CVE-2026-63223 (1)

Vendor Advisories for CVE-2026-63223 (1)

Vendor Pages for CVE-2026-63223 (1)

Same Patch Batch · codeigniter4 · 2026-07-31 · 4 CVEs total

CVE-2026-63221 9.4 CRITICAL CodeIgniter: SQL injection is possible via Query Builder deleteBatch() when used with wher
CVE-2026-63222 7.5 HIGH CodeIgniter: Path traversal in UploadedFile::move() when using client-provided filenames
CVE-2026-63220 4.8 MEDIUM CodeIgniter: Spoofable forwarded HTTPS headers in IncomingRequest::isSecure()

IV. Related Vulnerabilities

Same product: CodeIgniter4
Same vendor: codeigniter4
Same weakness: CWE-434

V. Comments for CVE-2026-63223

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