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Affected product: Dovecot IMAP Server
Internal reference: DOV-7830
Vulnerability type: CWE-1250 (Improper Preservation of Consistency Between Independent Representations of Shared State)
Vulnerable version: 2.4.0, 2.4.1
Vulnerable component: auth
Report confidence: Confirmed
Solution status: Fixed in 2.4.2
Researcher credits: Erik <erik () broadlux com>
Vendor notification: 2025-07-25
CVE reference: CVE-2025-30189
CVSS: 7.4 (CVSS3.1:AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N)

Vulnerability Details:
Using auth caching with oauth2 passdb, passwd passdb or userdb, or passwd userdb, causes the first lookup to be cached 
for all the lookups. This is because the cache key is "%u" which no longer actually expands to same as "%{user}". 

Workaround:
Disabling auth cache will prevent the issue. This can be done with auth_cache_size=0.

Fix
Install non-vulnerable version of Dovecot. Patch can be found at 
https://github.com/dovecot/core/compare/a70ce7d3e2f983979e971414c5892c4e30197231%5E...34caed79b76a7b82a2a9c94cf35371bec6c2b826.patch

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• Dovecot CVE-2025-30189: Auth cache causes access to wrong account Aki Tuomi via Fulldisclosure (Oct 29)