Skip to content
Fencer Intel
medium 4.3

CVE-2026-61911 json

An issue was discovered in Cyrus IMAP before 3.12.4.

published 2mo ago modified last mo. also EUVD-2026-75129

cvss
4.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 12%
public exploits
0
none known

Summary

An issue was discovered in Cyrus IMAP before 3.12.4. There is a Sieve mailbox existence oracle. An authenticated user could install a Sieve script that probed whether another user's private mailbox existed, or read the value of shared mailbox annotations, by observing which fileinto branch fired during LMTP delivery.

Patch / fix

  • cyrusimap Cyrus IMAP 3.8.8, 3.10.4, 3.12.4
  • cyrus-imapd Debian 14 3.12.4-1

debian advisories DEBIAN-CVE-2026-61911

  • cyrus-imapd openSUSE Leap 16.0 3.8.8-bp160.1.1

opensuse advisories openSUSE-SU-2026:21929-1

Is CVE-2026-61911 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-61911 updated cvss 4.3

cyrus-imapd: cyrus-imapd: Sieve fileinto mailbox existence oracle

  • Red Hat Enterprise Linux 6 cyrus-imapd, cyrus-imapd-utils, cyrus-imapd 3.8.3-10.el10
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 7 cyrus-imapd-utils, cyrus-imapd 3.8.3-10.el10 Red Hat Enterprise Linux 8 cyrus-imapd, cyrus-imapd-vzic, cyrus-imapd-utils, cyrus-imapd 3.8.3-10.el10 Red Hat Enterprise Linux 9 perl-Cyrus, cyrus-imapd, cyrus-imapd-libs, cyrus-imapd-utils, cyrus-imapd 3.8.3-10.el10 Red Hat Enterprise Linux 10 cyrus-imapd 3.8.3-10.el10
    affected: workaround, no fix available “Fix deferred”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2mo ago

Exploit prediction

0.22% chance of exploitation in the next 30 days, higher than 12% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
CNA 3.1 4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Affected products

  • cyrusimap Cyrus IMAP

Classification

Weakness
  • CWE-497 Exposure of Sensitive System Information to an Unauthorized Control Sphere

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.