CVE-2026-40205

State
Published
Severity
5.9 Medium
Published
Aug 28, 2026
Updated
Aug 28, 2026
Reserved
Apr 10, 2026

Read the record on cve.org

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.

Scores

CVSSScoreVectorSource
3.15.9 MediumCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:NOX

Weaknesses

Affected Products

ProductVersions
OX Dovecot ProOpen-Xchange GmbH
  • 2.3.11.2 to before 2.3.22.2Affected
  • 3.0.0 to before 3.0.7Affected
  • 3.1.0 to before 3.1.6Affected
OX Dovecot CEOpen-Xchange GmbH
  • 2.3.11.2 to before 2.4.5Affected

References

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