by Kastro
Paper/Archive/CVE-2026-105294

CVE-2026-105294

Legcord Legcord — Legcord 1.1.0 through 1.3.0 Chromium Switch Injection via settings.setConfig

EPSS 0.2%CVSS 9.1
critical.is priorityof 100
29
CVSS 9.1 (CNA)9.1 / 10 × 3027.3Not in CISA KEV+300.0EPSS percentile 8.5.085 × 201.7No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
Legcord1.1.0 – 1.3.0–CNA

Scores by source

VulnCheck (CNA)9.1CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
VulnCheck (CNA)7.4CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: partial

References

refgithub.com/Legcord/Legcord/issues/1163refgithub.com/Legcord/Legcordwriteupgithub.com/Legcord/Legcord/blob/v1.3.0/src/discord/ipc.ts#L296-L299writeupgithub.com/Legcord/Legcord/blob/v1.3.0/src/main.ts#L277-L307writeupvulncheck.com/advisories/legcord-1.1.0-through-1.3.0-chromium-switch-injection-via-settings-setconfig