CVE-2026-47086 | An issue was discovered in cyrus-imapd in Cyrus IMAP through… | CVSS 3.5 LOW

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.

Metadata

CVE ID: CVE-2026-47086
State: PUBLISHED
Assigner: mitre
Reserved: 2026-05-18 00:00 UTC
Published: 2026-07-16 00:00 UTC
Last updated: 2026-07-16 18:47 UTC
Primary CWE: CWE-863
CWE-863 Incorrect Authorization
Vendor / Product: cyrusimap / Cyrus IMAP
Sources: cve.org · NVD

Severity & Metrics

3.5 LOW CVSS 3.1

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N

SSVC — CISA Coordinator

Exploitation: none
Automatable: no
Tech. Impact: partial

Affected products (1)

Vendor	Product	Platform	Versions
cyrusimap	Cyrus IMAP	—	0 < 3.12.3

Weakness (CWE)

CWE	Source	Description
CWE-863	cna	CWE-863 Incorrect Authorization

CVSS scores (1)

Score	Severity	Version	Source	Vector
3.5	LOW	3.1	cna	CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N

References (2)