---
id: CVE-2026-61907
title: An issue was discovered in Cyrus IMAP before 3.12.4
summary: >-
  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…
severity: medium
cvss: 4.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N'
cwe:
  - CWE-863
vendor: cyrusimap
product: Cyrus IMAP
affected:
  - cyrus_imap < 3.8.8
  - cyrus_imap >= 3.9.0 < 3.10.4
  - cyrus_imap >= 3.11.0 < 3.12.4
published: '2026-09-09'
updated: '2026-09-14'
sourceUpdated: '2026-09-14T16:17:17.010'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-61907'
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-2026-61907.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-61907'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2526303'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-61907'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-61907'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00366
epssPercentile: 0.27733
ingestedAt: '2026-09-10T14:23:55.490Z'
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-14T15:37:23.762533Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## 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 2026-09-10 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-61907.json)