CVE-2026-47082

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{"bugzilla": {"description": "cyrus-imapd: Cyrus IMAP: ACL bypass in vacation 'fcc' feature allows unauthorized mailbox writes", "id": "2501449", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2501449"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.4", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L", "status": "draft"}, "cwe": "CWE-279", "details": ["An issue was discovered in cyrus-imapd in Cyrus IMAP through 3.12.2. The vacation \"fcc\" feature skips the destination-mailbox ACL. A user whose vacation Sieve script used :fcc (to save a copy of the sent message) could deliver vacation auto-reply copies into any mailbox the script could name, regardless of whether the script owner had insert permissions on the destination mailbox.", "A flaw was found in Cyrus IMAP's cyrus-imapd component. A user with low privileges can exploit a vulnerability in the vacation \"fcc\" feature. By crafting a specific Sieve script, the user can bypass access control lists and deliver vacation auto-reply messages into any mailbox, leading to unauthorized modification of mailbox content."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability."}, "name": "CVE-2026-47082", "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-2026-47082\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-47082\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 Moderate impact flaw in Cyrus IMAP allows a low-privileged user to bypass access control lists via a crafted Sieve script utilizing the vacation 'fcc' feature. This enables unauthorized delivery of vacation auto-reply messages into arbitrary mailboxes, leading to modification of mailbox content.", "threat_severity": "Moderate"}

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