Bug 2526682 - CVE-2026-40205 dovecot: Dovecot: Authorization bypass via partially valid OAuth2 token [fedora-all]
Summary: CVE-2026-40205 dovecot: Dovecot: Authorization bypass via partially valid OAu...
Keywords:
Status: NEW
Alias: None
Product: Fedora
Classification: Fedora
Component: dovecot
Version: rawhide
Hardware: Unspecified
OS: Unspecified
medium
medium
Target Milestone: ---
Assignee: Michal Hlavinka
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard: {"flaws": ["22a10bbf-ed9e-42d2-ab9b-d...
Depends On:
Blocks: CVE-2026-40205
TreeView+ depends on / blocked
 
Reported: 2026-09-01 07:26 UTC by Vladimir Vasilev
Modified: 2026-09-01 07:26 UTC (History)
3 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Type: ---
Embargoed:


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Description Vladimir Vasilev 2026-09-01 07:26:48 UTC
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

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.


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