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CVE PROGRAM SOURCE RECORD4.3 Medium

CVE-2026-61911

An issue was discovered in Cyrus IMAP before 3.12.4. There is a Sieve mailbox existence oracle. An authenticated user could install a Sieve script that probed whether another user'

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Status
Published
Published
Updated
Assigning organization
mitre

Description

An issue was discovered in Cyrus IMAP before 3.12.4. There is a Sieve mailbox existence oracle. An authenticated user could install a Sieve script that probed whether another user's private mailbox existed, or read the value of shared mailbox annotations, by observing which fileinto branch fired during LMTP delivery.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

cyrusimap Cyrus IMAP

Default version status: unaffected

  • 0 to < 3.8.8affected
  • 3.9.0 to < 3.10.4affected
  • 3.11.0 to < 3.12.4affected

References