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.

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Fixes

Solution

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Workaround

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History

Fri, 02 Oct 2026 15:15:00 +0000

Type Values Removed Values Added
First Time appeared Discord
Discord libdave
Vendors & Products Discord
Discord libdave

Fri, 02 Oct 2026 01:30:00 +0000

Type Values Removed Values Added
Description 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.
Title Improper MLS Welcome roster validation in Discord libdave allows unauthorized group membership
Weaknesses CWE-390
CWE-863
References
Metrics cvssV4_0

{'score': 9.4, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: Bugcrowd

Published:

Updated: 2026-10-02T18:18:52.157Z

Reserved: 2026-10-02T00:57:11.860Z

Link: CVE-2026-104480

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-02T02:17:02.007

Modified: 2026-10-02T19:16:41.020

Link: CVE-2026-104480

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-02T14:46:57Z

Weaknesses