CVE-2026-61909
Low
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.
SeverityLow
CVSS3.5
Exploit probability—
ProductCyrus Imap
PublishedSep 9, 2026
First seenSep 9, 2026
Weakness typeCWE-420CWE-420
How to fix
Update
- cyrus imap3.8.8, 3.10.4, 3.12.4 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| cyrus imap | v < 3.8.8, 3.9.0 ≤ v < 3.10.4, 3.11.0 ≤ v < 3.12.4 | 3.8.8, 3.10.4, 3.12.4 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
In the Intelligence 360 plan
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.