Bug 2558748 (CVE-2026-114732)

Summary: CVE-2026-114732 roundcubemail: roundcubemail: Unauthorized account access via alias login in multi-host environments
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Roundcube Webmail. In multi-host installations, user authentication using an alias address does not restrict account lookup to the specific Internet Message Access Protocol (IMAP) host. A remote authenticated user could exploit this flaw to gain unauthorized access to another user's account hosted on a different mail server.
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Bug Depends On: 2559006, 2559007    
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Description OSIDB Bzimport 2026-10-22 02:43:59 UTC 
Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 is affected by an improper authentication vulnerability in multi-host installations. When a user logs in with an alias address, rcube_user::query() matched the address against identity records without qualifying the lookup by IMAP host, so a login could be resolved to a user account belonging to a different IMAP host. Upstream fixed this in the commit “Fix bug where an alias login wasn’t qualified by IMAP host”.