CVE-2026-47086

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{"bugzilla": {"description": "cyrus-imapd: cyrus-imapd: Information disclosure via URLAUTH token bypass of Access Control Lists", "id": "2501461", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2501461"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.3", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N", "status": "draft"}, "cwe": "CWE-639", "details": ["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."], "mitigation": {"lang": "en:us", "value": "To reduce the attack surface, restrict network access to the Cyrus IMAP server to only trusted clients and networks by configuring appropriate firewall rules. If the Cyrus IMAP service is not essential, consider disabling it. To disable the `cyrus-imapd` service, execute `sudo systemctl stop cyrus-imapd` and `sudo systemctl disable cyrus-imapd`. Disabling the service will prevent all mail access via IMAP and may require a system restart to fully take effect."}, "name": "CVE-2026-47086", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "cyrus-imapd", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "cyrus-imapd", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "cyrus-imapd", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "cyrus-imapd", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "cyrus-imapd", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-07-16T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-47086\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-47086\nhttps://www.cyrusimap.org/3.12/imap/download/release-notes/3.12/x/3.12.3.html\nhttps://www.cyrusimap.org/imap/download/release-notes/index.html"], "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 deployments utilizing the Cyrus IMAP server.", "threat_severity": "Moderate"}

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