Description
An issue was discovered in cyrus-imapd in Cyrus IMAP through 3.12.2. The vacation "fcc" feature skips the destination-mailbox ACL. A user whose vacation Sieve script used :fcc (to save a copy of the sent message) could deliver vacation auto-reply copies into any mailbox the script could name, regardless of whether the script owner had insert permissions on the destination mailbox.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| cyrusimap | Cyrus IMAP | < 3.12.3 | 3.12.3 |
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 | 3.12.3-1 | — |
| Debian 13 | cyrus-imapd | 3.10.2-1+deb13u2 | — |
| Debian 12 | cyrus-imapd | 3.6.1-4+deb12u5 | — |
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 | 3.8.7-bp160.1.1 | openSUSE-SU-2026:21368-1 |
Advisories 2
- WID-SEC-2026-2387 cyrus imap: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 1, 2026
- openSUSE-SU-2026:21368-1 Security update for cyrus-imapd SUSE / openSUSE Security Updates · Jul 19, 2026