Generation of Predictable Numbers or Identifiers Affecting cyrusimap/cyrus-imapd package, versions [,3.12.3)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published19 Jul 2026
- disclosed16 Jul 2026
- creditUnknown
Introduced: 16 Jul 2026
CVE-2026-47085 (opens in a new tab)How to fix?
Upgrade cyrusimap/cyrus-imapd to version 3.12.3 or higher.
Overview
Affected versions of this package are vulnerable to Generation of Predictable Numbers or Identifiers via the URLAUTH process. An attacker can gain unauthorized read access to mailbox contents by forging a valid token using a predictable HMAC-SHA1 key when the victim has never issued an auth URL for a known folder name. This is only exploitable if the victim has not previously generated an auth URL for the targeted mailbox folder.