DEBIAN-CVE-2026-47085
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.)
DEBIAN-CVE-2026-47085
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:DEBIAN-CVE-2026-47085
cyrus-imapd
Source reference: /affected/0/package/name
- Affected versions
- 3.6.1-4
Source reference:
/affected/0/versions3.6.1-4+deb12u1Source reference:
/affected/0/versions3.6.1-4+deb12u2Source reference:
/affected/0/versions3.6.1-4+deb12u3Source reference:
/affected/0/versions3.6.1-4+deb12u4Source reference:
/affected/0/versions - Fixed versions
- 3.6.1-4+deb12u5
Source reference:
/affected/0/ranges - Prerequisites
- Not stated in this record
cyrus-imapd
Source reference: /affected/1/package/name
- Affected versions
- 3.10.2-1
Source reference:
/affected/1/versions3.10.2-1+deb13u1Source reference:
/affected/1/versions - Fixed versions
- 3.10.2-1+deb13u2
Source reference:
/affected/1/ranges - Prerequisites
- Not stated in this record
cyrus-imapd
Source reference: /affected/2/package/name
- Affected versions
- 3.10.2-1
Source reference:
/affected/2/versions3.12.0-1Source reference:
/affected/2/versions3.12.0-2Source reference:
/affected/2/versions3.12.1-1Source reference:
/affected/2/versions3.12.1-2Source reference:
/affected/2/versions3.12.1-3Source reference:
/affected/2/versions3.12.2-1Source reference:
/affected/2/versions3.12.3-1~bpo13+1Source reference:
/affected/2/versions - Fixed versions
- 3.12.3-1
Source reference:
/affected/2/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.6.1-4+deb12u5"
}
]
}
],
"package": {
"name": "cyrus-imapd",
"purl": "pkg:deb/debian/cyrus-imapd?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"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"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-47085.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.10.2-1+deb13u2"
}
]
}
],
"package": {
"name": "cyrus-imapd",
"purl": "pkg:deb/debian/cyrus-imapd?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"3.10.2-1",
"3.10.2-1+deb13u1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-47085.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.12.3-1"
}
]
}
],
"package": {
"name": "cyrus-imapd",
"purl": "pkg:deb/debian/cyrus-imapd?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"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"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-47085.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #57757 · Revision 1
- Added to Heist Feed
- Publisher date