What’s Vulnerable › Vulnerabilities

CVE-2026-61907

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-09 · updated 2026-09-14
• Weakness: CWE-863

Description

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.

Affected products

• cyrusimap Cyrus IMAP: before 3.8.8; from 3.9.0 before 3.10.4; from 3.11.0 before 3.12.4 — fixed in 3.10.4, 3.12.4, 3.8.8

How to fix

Upgrade to a fixed version: cyrusimap Cyrus IMAP 3.10.4, 3.12.4, 3.8.8. Check the vendor advisory for mitigations.

References

• https://cyrusimap.org
• https://www.cyrusimap.org/3.12/imap/download/release-notes/3.10/x/3.10.4.html
• https://www.cyrusimap.org/3.12/imap/download/release-notes/3.12/x/3.12.4.html
• https://www.cyrusimap.org/3.12/imap/download/release-notes/3.8/x/3.8.8.html

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