CVE-2026-47086
published 2026-07-16CVE-2026-47086: An issue was discovered in cyrus-imapd in Cyrus IMAP through 3.12.2. GENURLAUTH-issued tokens can bypass ACLs. Any authenticated user could mint a URLAUTH…
PriorityP418low3.5CVSS 3.1
AVNACHPRLUINSCCLINAN
EPSS
0.27%
18.6th percentile
An issue was discovered in cyrus-imapd in Cyrus IMAP through 3.12.2. GENURLAUTH-issued tokens can bypass ACLs. Any authenticated user could mint a URLAUTH token (via the GENURLAUTH command) for any mailbox they could name, even without read access on it. This would allow reading mail from mailboxes despite having no granted permissions.
Affected
2 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| cyrusimap | cyrus_imap | < 3.12.3 | 3.12.3 |
| debian | cyrus-imapd | — | — |
CVSS provenance
nvdv3.13.5LOWCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N
vendor_redhat3.5LOW
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Red Hat
cyrus-imapd: cyrus-imapd: Information disclosure via URLAUTH token bypass of Access Control Lists
vendor_redhat·2026-07-16·CVSS 3.5
CVE-2026-47086 [LOW] CWE-639 cyrus-imapd: cyrus-imapd: Information disclosure via URLAUTH token bypass of Access Control Lists
cyrus-imapd: cyrus-imapd: Information disclosure via URLAUTH token bypass of Access Control Lists
A flaw was found in cyrus-imapd. An authenticated user could exploit this vulnerability by minting a URLAUTH token through the GENURLAUTH command. This allows bypassing Access Control Lists (ACLs), which are rules that control access to mailboxes. Consequently, an attacker could read mail from any mailbox, even without having been granted explicit read permissions.
Statement: This flaw in cyrus-imapd allows an authenticated attacker to bypass Access Control Lists (ACLs) by minting a URLAUTH token via the GENURLAUTH command. This enables unauthorized reading of mail from any mailbox, even without explicit read permissions, posing a significant risk to data confidentiality in Red Hat deploymen
GHSA
An issue was discovered in cyrus-imapd in Cyrus IMAP through 3.12.2.
ghsa_unreviewed·2026-07-16
CVE-2026-47086 [LOW] CWE-863 An issue was discovered in cyrus-imapd in Cyrus IMAP through 3.12.2.
An issue was discovered in cyrus-imapd in Cyrus IMAP through 3.12.2. GENURLAUTH-issued tokens can bypass ACLs. Any authenticated user could mint a URLAUTH token (via the GENURLAUTH command) for any mailbox they could name, even without read access on it. This would allow reading mail from mailboxes despite having no granted permissions.
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-47086 cyrus-imapd: cyrus-imapd: Information disclosure via URLAUTH token bypass of Access Control Lists [fedora-all]
bugzilla·2026-07-27·CVSS 3.5
CVE-2026-47086 [LOW] CVE-2026-47086 cyrus-imapd: cyrus-imapd: Information disclosure via URLAUTH token bypass of Access Control Lists [fedora-all]
CVE-2026-47086 cyrus-imapd: cyrus-imapd: Information disclosure via URLAUTH token bypass of Access Control Lists [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
An issue was discovered in cyrus-imapd in Cyrus IMAP through 3.12.2. GENURLAUTH-issued tokens can bypass ACLs. Any authenticated user could mint a URLAUTH token (via the GENURLAUTH command) for any mailbox they could name, even without read access on it. This would allow reading mail from mailboxes despite having no granted permissions.
Bugzilla
CVE-2026-47086 cyrus-imapd: cyrus-imapd: Information disclosure via URLAUTH token bypass of Access Control Lists
bugzilla·2026-07-16·CVSS 3.5
CVE-2026-47086 [LOW] CVE-2026-47086 cyrus-imapd: cyrus-imapd: Information disclosure via URLAUTH token bypass of Access Control Lists
CVE-2026-47086 cyrus-imapd: cyrus-imapd: Information disclosure via URLAUTH token bypass of Access Control Lists
An issue was discovered in cyrus-imapd in Cyrus IMAP through 3.12.2. GENURLAUTH-issued tokens can bypass ACLs. Any authenticated user could mint a URLAUTH token (via the GENURLAUTH command) for any mailbox they could name, even without read access on it. This would allow reading mail from mailboxes despite having no granted permissions.
2026-07-16
Published