What is CVE-2026-61907?

CVE-2026-61907 is a medium-severity vulnerability in Cyrusimap Cyrus Imap, classified under Incorrect Authorization. CVSS score: 4.3/10. Published 2026-09-09.

How severe is CVE-2026-61907?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Auth bypass in Cyrusimap Cyrus Imap

CVE-2026-61907

An issue was discovered in Cyrus IMAP before 3.12.4. JMAP snooze bypasses the destination-mailbox ACL. An authenticated user with insert permissions on another user's snoozed mailbox could cause insertion of mail to that user's inbox, or any other of their mailboxes whose id was known to the user, despite having no insert permissions to the target mailbox.

Vulnerability class: Broken Access Control

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.

Affected products

Cyrusimap Cyrus Imap

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

cve@mitre.org
cve@mitre.org
cve@mitre.org
cve@mitre.org

Frequently asked questions

What is CVE-2026-61907?: CVE-2026-61907 is a medium-severity vulnerability in Cyrusimap Cyrus Imap, classified under Incorrect Authorization. CVSS score: 4.3/10. Published 2026-09-09.
How severe is CVE-2026-61907?: Medium severity. CVSS v3 base score is 4.3 out of 10.