CVE-2026-105294: Legcord 1.1.0 through 1.3.0 Chromium Switch Injection via settings.setConfig

Severity: high (CVSS 7.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-05 · updated 2026-10-06
Weakness: CWE-15

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.

Affected products

Legcord: from 1.1.0 through 1.3.0

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

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