What is CVE-2026-47086?

CVE-2026-47086 is a low-severity vulnerability in Cyrusimap Cyrus Imap, classified under Incorrect Authorization. CVSS score: 3.5/10. Published 2026-07-16.

How severe is CVE-2026-47086?

Low severity. CVSS v3 base score is 3.5 out of 10.

Auth bypass in Cyrusimap Cyrus Imap

CVE-2026-47086

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.

Vulnerability class: Broken Access Control

EPSS: 0.003 (18.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 3.5 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N.

Affected products

Cyrusimap Cyrus Imap — versions 0

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

Frequently asked questions

What is CVE-2026-47086?: CVE-2026-47086 is a low-severity vulnerability in Cyrusimap Cyrus Imap, classified under Incorrect Authorization. CVSS score: 3.5/10. Published 2026-07-16.
How severe is CVE-2026-47086?: Low severity. CVSS v3 base score is 3.5 out of 10.