Medium severity5.9NVD Advisory· Published Aug 28, 2026· Updated Sep 3, 2026
CVE-2026-40205
CVE-2026-40205
Description
An attacker that holds an OAuth2 token granting only part of the required scopes can authenticate, because when more than one scope is required in the configuration, the remote token validation paths accept a token that carries only one of them, while the local token validation path correctly requires all of them. The configured authorization policy is not enforced, so a token that was granted only part of the required permissions is accepted where it should have been rejected. Use local token validation where tokens can be validated locally. Update to non-vulnerable version. No publicly available exploits are known.
Affected products
3- osv-coords2 versionspkg:rpm/opensuse/dovecot24&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/dovecot24&distro=openSUSE%20Tumbleweed
< 2.4.4-160000.2.1+ 1 more
- (no CPE)range: < 2.4.4-160000.2.1
- (no CPE)range: < 2.4.5-1.1
Patches
Vulnerability mechanics
References
1News mentions
1- Dovecot: 17 Vulnerabilities Including Critical Flaws Disclosed Together on August 28, 2026Vypr Intelligence · Aug 28, 2026