Legcord up to 1.3.0 Configuration Injection setConfig additionalArguments cross site scripting

Summaryinfo

A vulnerability, which was classified as problematic, has been found in Legcord up to 1.3.0. This impacts the function setConfig of the component Configuration Injection. The manipulation of the argument additionalArguments leads to cross site scripting. This vulnerability is uniquely identified as CVE-2026-105294. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability was found in Legcord up to 1.3.0. It has been rated as problematic. This issue affects the function setConfig of the component Configuration Injection. The manipulation of the argument additionalArguments with an unknown input leads to a cross site scripting vulnerability. Using CWE to declare the problem leads to CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. Impacted is integrity. The summary by CVE is:

Legcord 1.1.0 through 1.3.0 contains a configuration injection vulnerability that allows script in the Discord page to write any config key via the window.legcord settings.setConfig bridge. Attackers exploiting a Discord XSS can set additionalArguments to persistently add --proxy-server and --ignore-certificate-errors switches, routing all client traffic through an interception proxy.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-105294 since 10/05/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1059.007 for this issue.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Name

• Legcord

Version

• 1.0
• 1.1
• 1.2
• 1.3.0

Website

• Product: https://github.com/Legcord/Legcord/

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