In breve
- CVE-2026-27656 è una vulnerabilità MEDIO (CVSS 6.1) 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): 0.18%, superiore al 7.9% delle vulnerabilità.
- Correzione: aggiornare a 10.11.12, 10.11.12+incompatible, 11.2.4, 11.2.4+incompatible o successiva.
Description
Mattermost versions 11.4.x <= 11.4.0, 11.3.x <= 11.3.1, 11.2.x <= 11.2.3, 10.11.x <= 10.11.11 fail to properly validate user identity in the OpenID {{IsSameUser()}} comparison logic, which allows an attacker to take over arbitrary user accounts via an overly permissive substring matching flaw in the user discovery flow. Mattermost Advisory ID: MMSA-2026-00590
NVD description
Mattermost versions 11.4.x <= 11.4.0, 11.3.x <= 11.3.1, 11.2.x <= 11.2.3, 10.11.x <= 10.11.11 fail to properly validate user identity in the OpenID {{IsSameUser()}} comparison logic, which allows an attacker to take over arbitrary user accounts via an overly permissive substring matching flaw in the user discovery flow.. Mattermost Advisory ID: MMSA-2026-00590
Altre vulnerabilità di github.com/mattermost/mattermost-server
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