In breve
- CVE-2026-28759 è una vulnerabilità MEDIO (CVSS 4.3) che riguarda github.com/mattermost/mattermost-server, github.com/mattermost/mattermost-server/v5, github.com/mattermost/mattermost-server/v6.
- Probabilità di sfruttamento nei prossimi 30 giorni (EPSS): 0.15%, superiore al 4.4% delle vulnerabilità.
- Correzione: aggiornare a 10.11.14+incompatible, 11.4.4+incompatible, 11.5.2+incompatible, 5.3.2-0.20260216150504-8738f8c4b3d4 o successiva.
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
Altre vulnerabilità di github.com/mattermost/mattermost-server
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