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Vulnerability · Published Mar 16, 2026 · Assigned by Mattermost

CVE-2026-2463Unauthorized access to invite ID during team creation

Medium 4.3

In plain English

A medium-severity missing authorization in Mattermost from Mattermost. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 7% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)4.3Medium
Exploit odds (30 days)0.2%top 92.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to filter invite IDs based on user permissions, which allows regular users to bypass access control restrictions and register unauthorized accounts via leaked invite IDs during team creation.. Mattermost Advisory ID: MMSA-2025-00565

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Gogithub.com/mattermost/mattermost-server11.2.3GHSA-fx49-m253-27jj
Gogithub.com/mattermost/mattermost-server5.3.2-0.20260105134819-cc427af41b2aGHSA-fx49-m253-27jj
Gogithub.com/mattermost/mattermost-server10.11.11GHSA-fx49-m253-27jj
Gogithub.com/mattermost/mattermost-server11.3.1GHSA-fx49-m253-27jj
Gogithub.com/mattermost/mattermost-server10.11.11+incompatible, 11.2.3+incompatible, 11.3.1+incompatibleGO-2026-4735
Gogithub.com/mattermost/mattermost-server/v5no fix listedGO-2026-4735
Gogithub.com/mattermost/mattermost-server/v6no fix listedGO-2026-4735
Gogithub.com/mattermost/mattermost/server/v88.0.0-20260105134819-cc427af41b2aGO-2026-4735
Gogithub.com/mattermost/mattermost/server/v88.0.0-20260105134819-cc427af41b2aGHSA-fx49-m253-27jj

Affected products (as reported)

VendorProductVersions
Mattermost Mattermost 11.3.0 – through 11.3.011.2.0 – through 11.2.210.11.0 – through 10.11.10

Weakness: CWE-862 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

References