CVE-2026-47086
Published:July 16, 2026
Updated:August 04, 2026
An issue was discovered in cyrus-imapd in Cyrus IMAP through 3.12.2. GENURLAUTH-issued tokens can bypass ACLs. Any authenticated user could mint a URLAUTH token (via the GENURLAUTH command) for any mailbox they could name, even without read access on it. This would allow reading mail from mailboxes despite having no granted permissions.
Affected Packages
https://github.com/cyrusimap/cyrus-imapd.git (GITHUB):
Affected version(s) >=cyrus-imapd-3.12.0 <cyrus-imapd-3.12.3Fix Suggestion:
Update to version cyrus-imapd-3.12.3https://github.com/cyrusimap/cyrus-imapd.git (GITHUB):
Affected version(s) >=cyrus-imapd-3.8.0 <cyrus-imapd-3.8.7Fix Suggestion:
Update to version cyrus-imapd-3.8.7https://github.com/cyrusimap/cyrus-imapd.git (GITHUB):
Affected version(s) >=cyrus-imapd-3.10.0 <cyrus-imapd-3.10.3Fix Suggestion:
Update to version cyrus-imapd-3.10.3Related Resources (2)
Do you need more information?
Contact UsCVSS v4
Base Score:
2.3
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
LOW
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
3.5
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Weakness Type (CWE)
Incorrect Authorization
EPSS
Base Score:
0.18