CVE-2026-47083 Information disclosure in Cyrus IMAP
An authenticated user can enumerate folder names and message UIDs across other accounts via ESEARCH, leaking metadata without reading content.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-47083?
CVE-2026-47083 is a medium-severity vulnerability in cyrusimap Cyrus IMAP, published on 16 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
An issue was discovered in cyrus-imapd in Cyrus IMAP through 3.12.2. There is an ESEARCH cross-user content oracle. By using the ESEARCH command, an authenticated IMAP user could enumerate folder names under any account they could name. Search would return UIDs of messages matching the search, creating a content oracle (without allowing arbitrary reads of the target's content).
Weakness: CWE-204
Which versions are affected by CVE-2026-47083?
How do I fix CVE-2026-47083?
Upgrade to a fixed version.
Is CVE-2026-47083 being exploited?
There is no known exploitation of CVE-2026-47083 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-47083, GHSA-7m4j-qx5p-343w, UBUNTU-CVE-2026-47083.