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Fencer Intel
low 3.5

CVE-2026-61910 json

An issue was discovered in Cyrus IMAP before 3.12.4.

published 2mo ago modified last mo. also EUVD-2026-75130

cvss
3.5
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 8%
public exploits
0
none known

Summary

An issue was discovered in Cyrus IMAP before 3.12.4. Mailbox/set let a sharee change a special-use role on shared mailboxes. An authenticated user with maySetKeywords on another user's mailbox could change that mailbox's specialuse annotation. This could allow the sharee to change the shared mailbox to perform the archived, snoozed, or other role, which might cause mail mail to be written to the shared mailbox, sharing more content than intended. (This is likely to be an unusual situation, made more unusual because if the target already has an non-shared mailbox with that role, role duplication suppression will prevent the update.)

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-2026-61910

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

opensuse advisories openSUSE-SU-2026:21929-1

Is CVE-2026-61910 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.

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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-2026-61910 updated cvss 4.2

cyrus-imapd: cyrus-imapd: Mailbox/set let sharee change special-use role on shared mailboxes

  • 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
last mo.

Exploit prediction

0.19% chance of exploitation in the next 30 days, higher than 8% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
CNA 3.1 3.5 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N
NVD 3.1 5.0 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N

Affected products

  • cyrusimap Cyrus IMAP

Classification

Weakness

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.