Vtiger CRM up to 8.3.0 Documents module config.inc.php unrestricted upload

Summaryinfo

A vulnerability identified as critical has been detected in Vtiger CRM up to 8.3.0. Affected by this vulnerability is an unknown functionality of the file config.inc.php of the component Documents module. This manipulation causes unrestricted upload. This vulnerability is handled as CVE-2026-23697. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability classified as critical was found in Vtiger CRM up to 8.3.0. Affected by this vulnerability is some unknown functionality of the file config.inc.php of the component Documents module. The manipulation with an unknown input leads to a unrestricted upload vulnerability. The CWE definition for the vulnerability is CWE-434. The product allows the attacker to upload or transfer files of dangerous types that can be automatically processed within the product's environment. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Vtiger CRM before 8.4.0 contains an authenticated file upload vulnerability that allows low-privileged users to achieve remote code execution by uploading a .phar file containing arbitrary PHP code through the Documents module, bypassing the extension denylist in config.inc.php which omits the .phar extension. The uploaded file is stored with its original .phar extension under the web-accessible storage directory, and a misconfigured .htaccess using Apache 2.2 syntax is silently ignored on Apache 2.4 deployments, allowing unauthenticated HTTP requests to directly execute the uploaded PHP payload.

It is possible to read the advisory at jivasecurity.com. This vulnerability is known as CVE-2026-23697 since 01/14/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1608.002 according to MITRE ATT&CK.

By approaching the search of inurl:config.inc.php it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 8.4.0 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-42055). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

• Customer Relationship Management System

Vendor

• Vtiger

Name

• CRM

Version

• 8.0
• 8.1
• 8.2
• 8.3.0

License

• open-source

Website

• Vendor: https://www.vtiger.com/

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Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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