๐Ÿ” CVE Alert

CVE-2026-40205

MEDIUM 5.9
CVSS Score
5.9
EPSS Score
0.0%
EPSS Percentile
0th

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.

CWE CWE-287
Vendor open-xchange gmbh
Product ox dovecot pro
Published Aug 28, 2026
Last Updated Aug 28, 2026
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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:N
Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
High
Availability
None

Affected Versions

Open-Xchange GmbH / OX Dovecot Pro
2.3.11.2 < 2.3.22.2 3.0.0 < 3.0.7 3.1.0 < 3.1.6
Open-Xchange GmbH / OX Dovecot CE
2.3.11.2 < 2.4.5

References

NVD โ†— CVE.org โ†— EPSS Data โ†—
documentation.open-xchange.com: https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0003.json