---
id: CVE-2026-61910
title: An issue was discovered in Cyrus IMAP before 3.12.4
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 annot…
severity: low
cvss: 3.5
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N'
cwe:
  - CWE-863
vendor: cyrus
product: imap
affected:
  - imap < 3.8.8
  - 'imap >= 3.9.0, < 3.10.4'
  - 'imap >= 3.11.0, < 3.12.4'
patched:
  - imap 3.12.4
published: '2026-09-09'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T15:24:04.610'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-61910'
references:
  - url: 'https://cyrusimap.org'
    label: cve@mitre.org
  - url: >-
      https://www.cyrusimap.org/3.12/imap/download/release-notes/3.10/x/3.10.4.html
    label: cve@mitre.org
  - url: >-
      https://www.cyrusimap.org/3.12/imap/download/release-notes/3.12/x/3.12.4.html
    label: cve@mitre.org
  - url: >-
      https://www.cyrusimap.org/3.12/imap/download/release-notes/3.8/x/3.8.8.html
    label: cve@mitre.org
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-61910.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-61910'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2526311'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-61910'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-61910'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00326
epssPercentile: 0.23056
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-14T15:38:13.126498Z'
ingestedAt: '2026-09-13T10:43:46.982Z'
scores:
  nvd: 3.5
  vendor: 4.2
---

## Overview

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.)

## Affected

- `imap < 3.8.8`
- `imap >= 3.9.0, < 3.10.4`
- `imap >= 3.11.0, < 3.12.4`

## Remediation

Upgrade past the affected range:

- `imap 3.12.4`

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-09-16 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-61910.json)