CVE-2026-47085An issue was discovered in cyrus-imapd in Cyrus IMAP through 3.12.2.
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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
- 4.0 MEDIUM (v3.1, NVD)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N
- Weakness (CWE)
- CWE-340
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Deferred
- Record last updated
- Jul 17, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
No affected products are listed yet.
References
- https://www.cyrusimap.org/3.12/imap/download/release-notes/3.12/x/3.12.3.html
- https://www.cyrusimap.org/imap/download/release-notes/index.html
The CVE record on cve.org NVD's entry
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