EUVD-2026-51398Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Remote unauthenticated multipart upload with attacker-controlled filename yields an arbitrary file write (integrity high), with no inherent confidentiality or availability loss, matching AV:N/AC:L/PR:N/I:H.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Lifecycle Timeline
4DescriptionCVE.org
CodeIgniter is a PHP full-stack web framework. Prior to 4.7.4, calling UploadedFile::move() without a second argument uses the client-provided filename without sanitization, allowing a remote attacker to use path traversal sequences to write uploaded content outside the intended directory when the application exposes an upload path. This issue is fixed in version 4.7.4.
AnalysisAI
Path traversal file write in the CodeIgniter4 PHP framework prior to 4.7.4 lets remote unauthenticated attackers place uploaded files outside the intended directory whenever an application calls UploadedFile::move() without an explicit second (name) argument. Because the default used the raw client-supplied filename, traversal sequences such as '../../public/shell.php' could drop attacker-controlled content into web-accessible or sensitive locations, potentially enabling code execution on affected sites. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the target application (1) exposes a file-upload path reachable by the attacker and (2) invokes UploadedFile::move() with only the target directory and no second (name) argument, so the unsanitized client filename is used as the default. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The published CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N, 7.5) reflects a network-reachable, unauthenticated, integrity-only impact with no confidentiality or availability loss, which matches an arbitrary file-write primitive. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker submits a multipart file-upload request to a vulnerable CodeIgniter4 endpoint, setting the multipart filename field to a traversal payload like '../../public/shell.php'. Because the application calls $file->move($destination) without a second argument, the framework writes the attacker's content to public/shell.php outside the intended upload folder; if that path is web-served and PHP-executable, the attacker then requests the file to achieve remote code execution. … |
| Remediation | Vendor-released patch: 4.7.4 - upgrade the codeigniter4/framework dependency to v4.7.4 or later (composer update codeigniter4/framework) to have move() sanitize the client-provided filename by default; see the advisory at https://github.com/codeigniter4/CodeIgniter4/security/advisories/GHSA-hhmc-q9hp-r662 and release https://github.com/codeigniter4/CodeIgniter4/releases/tag/v4.7.4. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: identify all CodeIgniter4 installations in production and audit UploadedFile::move() calls in application code to determine if explicit filename arguments are used; disable or restrict file upload functionality if not critical to operations. …
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Same weakness CWE-22 – Path Traversal
View allSame technique Path Traversal
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External POC / Exploit Code
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