En bref
- CVE-2026-28759 est une vulnérabilité MOYENNE (CVSS 4.3) touchant github.com/mattermost/mattermost-server, github.com/mattermost/mattermost-server/v5, github.com/mattermost/mattermost-server/v6.
- Probabilité d'exploitation dans les 30 prochains jours (EPSS) : 0.15%, plus élevée que 4.4% des vulnérabilités.
- Correctif : mettre à jour vers 10.11.14+incompatible, 11.4.4+incompatible, 11.5.2+incompatible, 5.3.2-0.20260216150504-8738f8c4b3d4 ou plus récent.
Description
Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3 fail to validate that a remote cluster has access to a channel before processing membership removal requests during shared channel membership sync, which allows a malicious remote cluster to remove any user from any channel, including private channels, via crafted membership sync messages targeting channels the remote cluster is not authorized to access. Mattermost Advisory ID: MMSA-2026-00576.
NVD description
Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3 fail to validate that a remote cluster has access to a channel before processing membership removal requests during shared channel membership sync, which allows a malicious remote cluster to remove any user from any channel, including private channels, via crafted membership sync messages targeting channels the remote cluster is not authorized to access. Mattermost Advisory ID: MMSA-2026-00576
Autres vulnérabilités de github.com/mattermost/mattermost-server
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