CVE-2026-105294

Description

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.

References

• https://github.com/Legcord/Legcord
• https://github.com/Legcord/Legcord/blob/v1.3.0/src/discord/ipc.ts#L296-L299
• https://github.com/Legcord/Legcord/blob/v1.3.0/src/main.ts#L277-L307
• https://github.com/Legcord/Legcord/issues/1163
• https://www.vulncheck.com/advisories/legcord-1.1.0-through-1.3.0-chromium-switch-injection-via-settings-setconfig