CVE-2026-104480 — Improper MLS Welcome roster validation in Discord libdave allows unauthorized group membership
Discord libdave before 1.2.0 did not reject an MLS Welcome message when the resulting group roster contained an unrecognized participant. An attacker in control of the DAVE sign…
Published: 2026-10-02 · CVSS: 9.4 · CVSS 4.0
Discord libdave before 1.2.0 did not reject an MLS Welcome message when the resulting group roster contained an unrecognized participant. An attacker in control of the DAVE signaling path (the voice gateway, or an equivalent position able to add, alter, or withhold signaling messages to a client) could cause affected clients to accept an unauthorized member into the end-to-end encrypted media session, compromising the confidentiality and integrity of audio and video.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7