CVE-2026-40205
MEDIUM
5,9
Source: [email protected]
Attack Vector: network
Attack Complexity: high
Privileges Required: low
User Interaction: none
Scope: unchanged
Confidentiality: low
Integrity: high
Availability: none
Description
AI Translation Available
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.
287
Improper Authentication
DraftCommon Consequences
Security Scopes Affected:
Integrity
Confidentiality
Availability
Access Control
Potential Impacts:
Read Application Data
Gain Privileges Or Assume Identity
Execute Unauthorized Code Or Commands
Applicable Platforms
Technologies:
Not Technology-Specific, Web Based, ICS/OT
https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/ox…