# CVE-2026-61909

## Summary

- **CVE ID:** CVE-2026-61909
- **Severity:** LOW
- **CVSS Score:** 3.5 (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N)
- **CWE:** CWE-420
- **Published:** Sep 9, 2026
- **Last Modified:** Sep 9, 2026

## Description

An issue was discovered in Cyrus IMAP before 3.12.4. CalDAV/CardDAV multiget bypasses a per-href ACL. An authenticated DAV user with some shared access to another user's calendar or address book could read even unshared events or contacts by including the target hrefs in a calendar-multiget or addressbook-multiget REPORT.

## Affected Products

- cyrusimap — Cyrus IMAP (0)
- cyrusimap — Cyrus IMAP (3.9.0)
- cyrusimap — Cyrus IMAP (3.11.0)

## References

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

---
_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._