CVE-2026-47086

Name	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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
cyrus-imapd (PTS)	bullseye	3.2.6-2+deb11u2	vulnerable
	bullseye (security)	3.2.6-2+deb11u4	vulnerable
	bookworm	3.6.1-4+deb12u4	vulnerable
	bookworm (security)	3.6.1-4+deb12u2	vulnerable
	trixie	3.10.2-1	vulnerable
	forky	3.12.2-1	vulnerable
	sid	3.12.3-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
cyrus-imapd	source	(unstable)	3.12.3-1

https://www.cyrusimap.org/3.12/imap/download/release-notes/3.12/x/3.12.3.html