CVE-2026-47087 Auth bypass in Cyrus IMAP
Attackers can use revoked URLAUTH tokens to access IMAP resources, bypassing authorization checks in Cyrus IMAP.
- 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-2026-47087?
CVE-2026-47087 is a low-severity authentication bypass 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. URLAUTH does not honor revoked authorizer access. A URLAUTH URL minted while the authorizer had access continued to work after that access was revoked.
Weakness: CWE-672
Which versions are affected by CVE-2026-47087?
How do I fix CVE-2026-47087?
Apply the vendor's patch.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-47087 being exploited?
There is no known exploitation of CVE-2026-47087 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-47087, GHSA-4pcj-qpx3-mjmx, UBUNTU-CVE-2026-47087.