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

> CVE-2026-104480: Improper MLS Welcome roster validation in Discord libdave allows unauthorized group membership. CVSS 9.4 (CVSS 4.0).

Canonical: https://rewindex.com/cve/CVE-2026-104480
Last updated: 2026-10-02T19:16:41Z

- Published: 2026-10-02 00:57 UTC · Updated: 2026-10-02 19:16 UTC · Assigner: Bugcrowd
- CVSS: 9.4 (CVSS 4.0) · Severity: Critical
- EPSS: 0.40%, 34th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-390, CWE-863

## 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 vendors and products

- Discord: libdave

## Tracked companies

- [Discord](https://rewindex.com/company/discord.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-104480)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-104480)
- [https://daveprotocol.com/](https://daveprotocol.com/)
- [https://github.com/discord/libdave](https://github.com/discord/libdave)
- [https://github.com/discord/libdave/commit/9686fbaea864aa19f0675e486672b6a77811b6a1](https://github.com/discord/libdave/commit/9686fbaea864aa19f0675e486672b6a77811b6a1)
- [https://github.com/discord/libdave/releases/tag/v1.2.0/cpp](https://github.com/discord/libdave/releases/tag/v1.2.0/cpp)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-104480 · Markdown: https://rewindex.com/cve/CVE-2026-104480.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-104480 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:12:45.889Z