{"id":"CVE-2026-47085","aliases":["DEBIAN-CVE-2026-47085","EUVD-2026-45008","GHSA-8jrh-wq6h-53c4","UBUNTU-CVE-2026-47085","openSUSE-SU-2026:21368-1"],"status":"published","title":"An issue was discovered in cyrus-imapd in Cyrus IMAP through 3.12.2. URLAUTH token forgery can...","description":"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.)","severity":{"version":"3.1","score":4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00297,"percentile":0.22518,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-340"],"published":"2026-07-16T00:00:00Z","modified":"2026-10-25T09:47:42Z","fixes":[{"ecosystem":"Debian:12","package":"cyrus-imapd","fixed_in":["3.6.1-4+deb12u5"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"cyrus-imapd","fixed_in":["3.10.2-1+deb13u2"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"cyrus-imapd","fixed_in":["3.12.3-1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"cyrus-imapd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.6.1-4+deb12u5"}]}],"versions":["3.6.1-4","3.6.1-4+deb12u1","3.6.1-4+deb12u2","3.6.1-4+deb12u3","3.6.1-4+deb12u4"]},{"source":"osv","ecosystem":"Debian:13","package":"cyrus-imapd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.10.2-1+deb13u2"}]}],"versions":["3.10.2-1","3.10.2-1+deb13u1"]},{"source":"osv","ecosystem":"Debian:14","package":"cyrus-imapd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.12.3-1"}]}],"versions":["3.10.2-1","3.12.0-1","3.12.0-2","3.12.1-1","3.12.1-2","3.12.1-3","3.12.2-1","3.12.3-1~bpo13+1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:18.04:LTS","package":"cyrus-imapd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.5.10-3build1","2.5.10-3build2","2.5.10-3ubuntu1","2.5.10-3ubuntu1.1","2.5.10-3ubuntu1.1+esm1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:20.04:LTS","package":"cyrus-imapd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.0.11-1","3.0.11-1build1","3.0.12-1","3.0.12-2","3.0.12-2ubuntu2","3.0.12-2ubuntu3","3.0.13-2ubuntu1","3.0.13-3ubuntu1","3.0.13-4ubuntu1","3.0.13-5","3.0.13-5ubuntu0.1~esm1","3.0.13-5ubuntu0.1~esm2"]},{"source":"osv","ecosystem":"Ubuntu:Pro:22.04:LTS","package":"cyrus-imapd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.2.6-2build1","3.4.2-2","3.4.2-2build1","3.4.3-2","3.4.3-3","3.4.3-3build2","3.4.3-3ubuntu0.1","3.4.3-3ubuntu0.1+esm1","3.4.3-3ubuntu0.3","3.4.3-3ubuntu0.3+esm1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:24.04:LTS","package":"cyrus-imapd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.8.0-5","3.8.1-1","3.8.1-1build1","3.8.1-1build2","3.8.1-3","3.8.1-3build3","3.8.2-1","3.8.2-1ubuntu0.1~esm1","3.8.2-1ubuntu0.2","3.8.2-1ubuntu0.2+esm1"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"cyrus-imapd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.12.1-3","3.12.2-1","3.12.2-1build1","3.12.3-3build1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"cyrus-imapd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.10.2-1","3.12.1-2","3.12.1-2build1","3.12.1-3"]},{"source":"osv","ecosystem":"openSUSE:Leap 16.0","package":"cyrus-imapd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.8.7-bp160.1.1"}]}],"bundled":9}],"products":[{"vendor":"cyrusimap","product":"cyrus imap"}],"references":[{"url":"https://www.cyrusimap.org/imap/download/release-notes/index.html","tags":["report"]},{"url":"https://www.cyrusimap.org/3.12/imap/download/release-notes/3.12/x/3.12.3.html","tags":["report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-47085"},{"url":"https://github.com/advisories/GHSA-8jrh-wq6h-53c4"},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-47085","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-47085","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-47085","tags":["report"]},{"url":"","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1271617","tags":["report"]},{"url":"https://bugzilla.suse.com/1271618","tags":["report"]},{"url":"https://bugzilla.suse.com/1271619","tags":["report"]},{"url":"https://bugzilla.suse.com/1271620","tags":["report"]},{"url":"https://bugzilla.suse.com/1271621","tags":["report"]},{"url":"https://bugzilla.suse.com/1271622","tags":["report"]},{"url":"https://bugzilla.suse.com/1271623","tags":["report"]},{"url":"https://bugzilla.suse.com/1271624","tags":["report"]},{"url":"https://bugzilla.suse.com/1271625","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2026-47081","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-47082","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-47083","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-47084","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-47085","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-47086","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-47087","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-47088","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-47089","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2026-47085","description":"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.)","status":"published","published":"2026-07-16T00:00:00Z","modified":"2026-07-16T18:54:53.528Z","cvss":[{"version":"3.1","score":4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-340"],"updated_at":"2026-11-02T13:36:40.478484Z"}],"euvd":[{"id":"EUVD-2026-45008","description":"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.)","status":"published","published":"2026-07-16T00:00:00Z","modified":"2026-07-16T18:54:53Z","cvss":[{"version":"3.1","score":4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T18:19:51.364603Z"}],"ghsa":[{"id":"GHSA-8jrh-wq6h-53c4","title":"An issue was discovered in cyrus-imapd in Cyrus IMAP through 3.12.2. URLAUTH token forgery can...","description":"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.)","status":"published","published":"2026-07-16T21:30:36Z","modified":"2026-07-16T21:30:36Z","cvss":[{"version":"3.1","score":4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N","level":"medium"}],"cwes":["CWE-340"],"updated_at":"2026-11-02T15:09:34.599528Z"}],"nvd":[{"id":"CVE-2026-47085","description":"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.)","status":"published","published":"2026-07-16T19:16:49.12Z","modified":"2026-10-24T20:10:00.137Z","cvss":[{"version":"3.1","score":4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-340"],"updated_at":"2026-11-02T14:12:30.250437Z"}],"osv":[{"id":"DEBIAN-CVE-2026-47085","description":"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.)","status":"published","published":"2026-07-16T19:16:49.12Z","modified":"2026-10-25T09:47:42.631140992Z","cvss":[{"version":"3.1","score":4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T15:45:56.444225Z"},{"id":"UBUNTU-CVE-2026-47085","description":"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.)","status":"published","published":"2026-07-16T19:16:00Z","modified":"2026-10-17T13:00:15.132995114Z","cvss":[{"version":"3.1","score":4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T16:56:30.797112Z"},{"id":"openSUSE-SU-2026:21368-1","title":"Security update for cyrus-imapd","description":"This update for cyrus-imapd fixes the following issues:\n\nChanges in cyrus-imapd:\n\n- Update to 3.8.7 (bugfix release)\n- CVE-2026-47081: XAPPLEPUSHSERVICE folder existence oracle and push hijack (bsc#1271617)\n- CVE-2026-47083: ESEARCH cross-user content oracle (bsc#1271619)\n- CVE-2026-47082: Vacation \"fcc\" skips destination-mailbox ACL (bsc#1271618)\n- CVE-2026-47084: LOCALDELETE bypassed ACL checks (bsc#1271620)\n- CVE-2026-47085: URLAUTH token forgery via missing mboxkey (bsc#1271621)\n- CVE-2026-47086: GENURLAUTH issued tokens bypassing ACLs (bsc#1271622)\n- CVE-2026-47087: URLAUTH does not honor revoked authorizer access (bsc#1271623)\n- CVE-2026-47088: Heap exposure in nested MIME comment parsing (bsc#1271624)\n- CVE-2026-47089: LISTRIGHTS not limited to users with admin access (bsc#1271625)\n","status":"published","published":"2026-07-17T15:44:26Z","modified":"2026-07-19T13:15:06.586381849Z","updated_at":"2026-11-02T16:58:41.885092Z"}]}}