CVE-2026-40205

MEDIUM
5.9
CVSS Score
Published: August 28, 2026 at 10:12 AM UTC
Updated: September 3, 2026 at 06:24 PM UTC
1 product affected across 1 vendorOX Dovecot

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Severity
MEDIUM5.9
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

2.3.11.2 ≤ v < 2.3.22.22.3.11.2 ≤ v < 2.4.53.0.0 ≤ v < 3.0.73.1.0 ≤ v < 3.1.62.3.11.23.0.03.1.0
Affected range stops below 2.3.22.2, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.4.5, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.0.7, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.1.6, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.9MEDIUMOX
Attack Vector
NETWORK
Complexity
HIGH
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-287

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