CVE-2025-30189

Severity: high (CVSS 7.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-10-31 · updated 2026-10-07
Weakness: CWE-1250

Description

When cache is enabled, some passdb/userdb drivers incorrectly cache all users with same cache key, causing wrong cached information to be used for these users. After cached login, all subsequent logins are for same user. Install fixed version or disable caching either globally or for the impacted passdb/userdb drivers. No publicly available exploits are known.

Affected products

Open-Xchange GmbH OX Dovecot Pro: through 3.1.0; through 2.4.0

References

https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0001.json
http://seclists.org/fulldisclosure/2025/Oct/29
http://www.openwall.com/lists/oss-security/2025/10/29/4

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