Low severity · published Jul 16, 2026
CVE-2026-47086
An issue was discovered in cyrus-imapd in Cyrus IMAP through 3.12.2
3.5
CVSS
0.3%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N
Attack vector
Network
Complexity
High
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 19% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CI
Cyrus IMAP · cyrusimap
before 3.12.3 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-47086
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-47086
www.cyrusimap.org
https://www.cyrusimap.org/3.12/imap/download/release-notes/3.12/x/3.12.3.html
www.cyrusimap.org
https://www.cyrusimap.org/imap/download/release-notes/index.html
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