Threats Tagged 'cve-2026-73208'

Multiple critical security vulnerabilities affecting Dovecot 2.4.4 and related versions in Red Hat Enterprise Linux 8 have been addressed in an update to version 2.3.16-16.el8_10. These vulnerabilities include denial of service, authentication bypass, and remote code execution issues across various Dovecot components such as IMAP, ManageSieve, and sieve scripts. The update fixes critical issues including a use-after-free leading to arbitrary code execution and several denial of service vulnerabilities caused by malformed inputs or resource exhaustion.

CVE-2026-73208 is an improper authentication vulnerability in Open-Xchange GmbH OX Dovecot Pro. It occurs when an OAuth2 token response lacks a scope claim, causing the system to use the audience claim instead for scope verification. Since audience and scope represent different concepts, a token without relevant permissions may be accepted if its audience matches a configured scope name, allowing unauthorized access. This also masks identity provider misconfigurations where scopes are not issued. Users should ensure the identity provider issues scope claims for all tokens and avoid matching scope names to audience values. No public exploits are known.

CVE-2026-73208 is an improper authentication vulnerability in Open-Xchange GmbH OX Dovecot Pro. It occurs when an OAuth2 token response lacks a scope claim, causing the system to use the audience claim instead for scope validation. This can allow an attacker holding a token intended for a different purpose to authenticate improperly if the audience claim matches a configured scope name. The issue also reveals identity provider misconfigurations where scopes are not issued. No public exploits are known. Users should ensure identity providers issue scope claims and avoid matching audience values with scope names. Updating to a non-vulnerable version is recommended.