CVE-2026-104480
Improper MLS Welcome roster validation in Discord libdave allows unauthorized group membership
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.
INFO
Published Date :
Oct. 2, 2026, 2:17 a.m.
Last Modified :
Oct. 2, 2026, 2:17 a.m.
Remotely Exploit :
No
Source :
4ac701fe-44e9-4bcd-9585-dd6449257611
Affected Products
The following products are affected by CVE-2026-104480
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 4.0 | CRITICAL | 4ac701fe-44e9-4bcd-9585-dd6449257611 | ||||
| CVSS 4.0 | CRITICAL | 4ac701fe-44e9-4bcd-9585-dd6449257611 |
Solution
- Update libdave to version 1.2.0 or later.
- Apply relevant security patches provided by the vendor.
- Validate group roster integrity after updates.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-104480.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-104480 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-104480
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-104480 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-104480 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by 4ac701fe-44e9-4bcd-9585-dd6449257611
Oct. 02, 2026
Action Type Old Value New Value 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. Added CVSS V4.0 AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-390 Added CWE CWE-863 Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/104xxx/CVE-2026-104480.json">CVE-2026-104480</a> Added Reference https://daveprotocol.com/ Added Reference https://github.com/discord/libdave Added Reference https://github.com/discord/libdave/commit/9686fbaea864aa19f0675e486672b6a77811b6a1 Added Reference https://github.com/discord/libdave/releases/tag/v1.2.0/cpp