LEEJO CGI up to 4.x Content-Disposition lib/CGI.pm header name injection

Summaryinfo

A vulnerability was found in LEEJO CGI up to 4.x. It has been classified as critical. Affected by this vulnerability is the function header of the file lib/CGI.pm of the component Content-Disposition. The manipulation of the argument Name leads to injection. This vulnerability is referenced as CVE-2026-120647. Remote exploitation of the attack is possible. No exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in LEEJO CGI up to 4.x and classified as critical. This issue affects the function header of the file lib/CGI.pm of the component Content-Disposition. The manipulation of the argument name with an unknown input leads to a injection vulnerability. Using CWE to declare the problem leads to CWE-74. The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component. Impacted is integrity, and availability. The summary by CVE is:

CGI versions before 5.00 for Perl allow Content-Disposition parameter injection via unescaped double quotes in the header attachment filename. header(-attachment => $name) writes $name into the quoted filename parameter of Content-Disposition without escaping double quotes. An application that passes request data as the attachment name can be made to send a second filename parameter, changing the name the response is saved under.

The advisory is shared at metacpan.org. The identification of this vulnerability is CVE-2026-120647 since 11/02/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1055 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 375687 (Linux Distros Unpatched Vulnerability : CVE-2026-120647), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.00 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (375687). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Vendor

• LEEJO

Name

• CGI

Version

• 4.x

CPE 2.3info

• 🔒

CPE 2.2info

• 🔒

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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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