Predictable from Observable State Affecting cyrus-imapd package, versions *


Severity

Recommended
0.0
medium
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.3% (22nd percentile)

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  • Snyk IDSNYK-RHEL7-CYRUSIMAPD-18005277
  • published17 Jul 2026
  • disclosed16 Jul 2026

Introduced: 16 Jul 2026

CVE-2026-47085  (opens in a new tab)
CWE-341  (opens in a new tab)

How to fix?

There is no fixed version for RHEL:7 cyrus-imapd.

NVD Description

Note: Versions mentioned in the description apply only to the upstream cyrus-imapd package and not the cyrus-imapd package as distributed by RHEL. See How to fix? for RHEL:7 relevant fixed versions and status.

An issue was discovered in cyrus-imapd in Cyrus IMAP through 3.12.2. URLAUTH token forgery can occur via a missing mboxkey. If an attacker knew a folder name on the victim's account for which the victim had never issued an auth URL, they could forge a working URLAUTH token by computing an HMAC-SHA1 value with a predictable key, giving them read access to the mailbox. (URLAUTH is an obscure feature, meaning that the odds of any user actually being susceptible to this attack are very low. Perhaps no public clients use URLAUTH.)

CVSS Base Scores

version 3.1