EUVD-2026-51399Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Network and unauthenticated (AV:N/PR:N/UI:N), but AC:H because exploitation depends on a specific non-default app pattern (is_image/mime_in only, client filename saved, script-enabled web dir); successful exploitation yields full RCE so C/I/A: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:H/I:H/A:H
Lifecycle Timeline
4DescriptionCVE.org
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.
Articles & Coverage 1
AnalysisAI
Unauthenticated file upload validation bypass in the CodeIgniter4 PHP framework (versions prior to 4.7.4) lets a remote attacker upload executable PHP content by exploiting that the is_image and mime_in strict validation rules never enforced a safe client-supplied filename extension. Applications are affected only when they validate uploads solely with is_image or mime_in (without an independent extension check such as ext_in), persist files under the attacker-controlled client filename, and store them in a web-accessible, script-enabled directory. …
Unlock full vulnerability intelligence
- Risk assessment & exploitation conditions
- Attack chain visualization
- Remediation with exact patch versions
- Threat intelligence from 22 sources
- Personal watchlist & email alerts
Free forever · No credit card required
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an application that (1) validates uploads using the is_image or mime_in rule as the only content gate, with NO independent safe-extension check such as ext_in; (2) saves the uploaded file using the client-supplied filename rather than a server-generated name; and (3) stores uploads in a web-accessible directory where the server is configured to execute PHP. … 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:H/I:H/A:H, 9.8) treats this as trivially exploitable network RCE, but that rating understates the real precondition burden: exploitation is not against a default install of the framework, but against applications that (1) rely on is_image/mime_in as their only upload gate, (2) save files under the client-supplied name, and (3) place them in a script-executable web directory. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker targets a CodeIgniter4 site that accepts avatar or document uploads validated only with is_image or mime_in and stores them under the original filename in /public/uploads/. The attacker submits a file named 'shell.php' whose bytes form a valid GIF (a polyglot) or otherwise satisfy the content/MIME check, the framework accepts it, and the attacker then requests /uploads/shell.php to execute their PHP payload as the web server user. … |
| Remediation | Vendor-released patch: 4.7.4 - upgrade the codeigniter4/codeigniter4 dependency to 4.7.4 or later (composer update), which makes is_image and mime_in reject filenames whose client extension is non-image or mismatched with the detected content. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all CodeIgniter4 deployments and document version numbers for each instance. …
Sign in for detailed remediation steps and compensating controls.
Threat intelligence, references, and detailed analysis are available after sign-in.
sapi/cgi/cgi_main.c in PHP before 5.3.12 and 5.4.x before 5.4.2, when configured as a CGI script (aka php-cgi), does not
(1) boardData102.php, (2) boardData103.php, (3) boardDataJP.php, (4) boardDataNA.php, and (5) boardDataWW.php in Netgear
ProjectSend versions prior to r1720 are affected by an improper authentication vulnerability. Rated critical severity (C
Roundcube Webmail contains a critical PHP object deserialization vulnerability (CVE-2025-49113, CVSS 9.9) that allows au
Util/PHP/eval-stdin.php in PHPUnit before 4.8.28 and 5.x before 5.6.3 allows remote attackers to execute arbitrary PHP c
Palo Alto Networks PAN-OS management web interface contains an authentication bypass allowing unauthenticated attackers
Nagios XI version xi-5.7.5 is affected by OS command injection. Rated high severity (CVSS 8.8), this vulnerability is re
Nagios XI version xi-5.7.5 is affected by OS command injection. Rated high severity (CVSS 8.8), this vulnerability is re
The get_referers function in /opt/ws/bin/sblistpack in Sophos Web Appliance before 3.7.9.1 and 3.8 before 3.8.1.1 allows
The Backup Migration plugin for WordPress is vulnerable to Remote Code Execution in all versions up to, and including, 1
NetAlertX (formerly PiAlert) versions 23.01.14 through 24.x before 24.10.12 allow unauthenticated command injection thro
The GiveWP - Donation Plugin and Fundraising Platform plugin for WordPress is vulnerable to PHP Object Injection in all
Same technique File Upload
View allShare
External POC / Exploit Code
Leaving vuln.today