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
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| cyrusimap | Cyrus IMAP | < 3.8.8, 3.9.0 – < 3.10.4, 3.11.0 – < 3.12.4 | 3.8.8 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | cyrus-imapd | 3.12.4-1 | — |
| Debian 13 | cyrus-imapd | No fix yet | — |
| Debian 12 | cyrus-imapd | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | cyrus-imapd | No fix yet | — |
| Ubuntu 26.04 LTS | cyrus-imapd | No fix yet | — |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 24.04 LTS | cyrus-imapd | No fix yet | — |
| Ubuntu Pro 22.04 LTS | cyrus-imapd | No fix yet | — |
| Ubuntu Pro 20.04 LTS | cyrus-imapd | No fix yet | — |
| Ubuntu Pro 18.04 LTS | cyrus-imapd | No fix yet | — |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 16.0 | cyrus-imapd | 3.8.8-bp160.1.1 | openSUSE-SU-2026:21929-1 |
Advisories 2
- openSUSE-SU-2026:21929-1 Security update for cyrus-imapd SUSE / openSUSE Security Updates · Sep 25, 2026
- WID-SEC-2026-3301 cyrus imap: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 24, 2026