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  4. CVE 2026 104480 improper mls welcome roster validation in discord
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Back to active CVEs
Critical · CVSS 9.4CVE-2026-104480

Improper MLS Welcome roster validation in Discord libdave allows unauthorized group membership

Answer in brief

CVE-2026-104480 records a Critical severity (CVSS 9.4) vulnerability in Improper MLS Welcome roster validation in Discord libdave allows unauthorized group membership. The current sources do not mark it as known exploited. The current feed maps Discord/discord/libdave (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 2, 2026Updated Oct 2, 2026Source checked Oct 2, 2026First seen by HOL Oct 2, 2026Material review Oct 2, 2026
Upstream Advisory

Key facts

Risk
Critical · CVSS 9.4
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 9.4. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Discord/discord/libdave (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Discord/discord/libdavegeneric>=1.1.0 <1.2.0 || >=7b15f1fc16f159da0478aa6be909e38f1e957833 <9686fbaea864aa19f0675e486672b6a77811b6a11.2.0, 9686fbaea864aa19f0675e486672b6a77811b6a1

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Discord/discord/libdave.
  2. 2Review the reported fix. Update Discord/discord/libdave to 1.2.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 2, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 2, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 2, 2026

Sources and claim methodology

  • Source referencedaveprotocol.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Fail-open error handling in the data masking utility in Powertools for AWS Lambda (Python)Also CWE-390
  • calcom cal.diy PBAC Permission BookingAccessService.ts doesUserIdHaveAccessToBooking authorizationAlso CWE-863
  • RT-Labs AB C-Open CANopen SDO Server Write Protection BypassAlso CWE-863
  • Office-PowerPoint-MCP-Server through 2.0.7 Path Traversal via save_presentation and manage_imageSame generic ecosystem
  • Wormhole.app SSRFSame generic ecosystem
  • Physical UART Access Leading to an Unauthenticated Root Shell in TP-Link Kasa EC70 and EC71Same generic ecosystem

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-390, CWE-863
Source
CVE List V5
Source checked
Oct 2, 2026
References
4 linked sources
Open source record