What’s Vulnerable › Vulnerabilities

CVE-2026-104480: Improper MLS Welcome roster validation in Discord libdave allows unauthorized group membership

• Severity: critical (CVSS 9.4 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-02 · updated 2026-10-02
• Weakness: CWE-390

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.

Affected products

• Discord libdave: from 1.1.0 before 1.2.0 — fixed in 1.2.0

How to fix

Upgrade to a fixed version: Discord libdave 1.2.0. Check the vendor advisory for mitigations.

References

• https://daveprotocol.com/
• https://github.com/discord/libdave
• https://github.com/discord/libdave/commit/9686fbaea864aa19f0675e486672b6a77811b6a1
• https://github.com/discord/libdave/releases/tag/v1.2.0/cpp

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