Is CVE-2026-47086 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-47086?

CVE-2026-47086 has a CVSS v3 severity of LOW (3.5).

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CVE-2026-47086

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.