CVE-2025-9072 One-Click Mattermost Account Takeover via Poisoned RelayState SAML Parameter

Mattermost versions 10.10.x = 10.10.1, 10.5.x = 10.5.9, 10.9.x = 10.9.4 fail to validate the redirectto parameter, allowing an attacker to craft a malicious link that, once a user authenticates with their SAML provider, could post the user’s cookies to an attacker-controlled URL...