CVE-2026-61911

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Source
https://cve.org/CVERecord?id=CVE-2026-61911
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-61911.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-61911
Downstream
Published
2026-09-09T00:00:00Z
Modified
2026-09-18T03:48:31Z
Severity
  • 4.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N CVSS Calculator
Summary
[none]
Details

An issue was discovered in Cyrus IMAP before 3.12.4. There is a Sieve mailbox existence oracle. An authenticated user could install a Sieve script that probed whether another user's private mailbox existed, or read the value of shared mailbox annotations, by observing which fileinto branch fired during LMTP delivery.

Database specific 
{
    "cna_assigner": "mitre",
    "cwe_ids": [
        "CWE-497"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/61xxx/CVE-2026-61911.json",
    "unresolved_ranges": [
        {
            "extracted_events": [
                {
                    "fixed": "3.8.8"
                },
                {
                    "introduced": "3.9.0"
                },
                {
                    "fixed": "3.10.4"
                },
                {
                    "introduced": "3.11.0"
                },
                {
                    "fixed": "3.12.4"
                }
            ],
            "source": "AFFECTED_FIELD"
        },
        {
            "extracted_events": [
                {
                    "fixed": "3.8.8"
                },
                {
                    "introduced": "3.9.0"
                },
                {
                    "fixed": "3.10.4"
                },
                {
                    "introduced": "3.11.0"
                },
                {
                    "fixed": "3.12.4"
                }
            ],
            "source": "CPE_FIELD"
        },
        {
            "extracted_events": [
                {
                    "fixed": "3.12.4"
                }
            ],
            "source": "DESCRIPTION"
        }
    ]
}
References

Affected packages

Git / github.com/cyrusimap/cyrus-imapd

Affected ranges

Type
GIT
Repo
https://github.com/cyrusimap/cyrus-imapd
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
08031fd42e027bdb5bc286e428a03e1c53c2e105
Fixed
ad6d4e67d0edbdf99e7ce31658c67640f30479c4
Fixed
f8ffbe4a87455c591fe355b03a2713a50f8441ab
Database specific
Show details 
{
    "cpe": "cpe:2.3:a:cyrus:imap:*:*:*:*:*:*:*:*",
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "3.8.8"
        },
        {
            "introduced": "3.9.0"
        },
        {
            "fixed": "3.10.4"
        },
        {
            "introduced": "3.11.0"
        },
        {
            "fixed": "3.12.4"
        }
    ],
    "source": "CPE_RANGE"
}

Affected versions

cyrus-imapd-2.*
cyrus-imapd-2.4.0
cyrus-imapd-2.4.1
cyrus-imapd-2.4.2
cyrus-imapd-2.5-snapshot-autoconf-and-automake
cyrus-imapd-3.*
cyrus-imapd-3.0.0-beta1
cyrus-imapd-3.0.0-beta2
cyrus-imapd-3.0.0-beta3
cyrus-imapd-3.0.0-beta4
cyrus-imapd-3.0.0-beta5
cyrus-imapd-3.0.0-beta6
cyrus-imapd-3.0.0-rc1
cyrus-imapd-3.0.0-rc2
cyrus-imapd-3.0.0-rc3
cyrus-imapd-3.0.0-rc4
cyrus-imapd-3.1.0-dev
cyrus-imapd-3.1.1
cyrus-imapd-3.1.2
cyrus-imapd-3.1.3
cyrus-imapd-3.1.4
cyrus-imapd-3.1.5
cyrus-imapd-3.1.6
cyrus-imapd-3.1.7
cyrus-imapd-3.1.8
cyrus-imapd-3.1.9
cyrus-imapd-3.10.0
cyrus-imapd-3.10.0-alpha0
cyrus-imapd-3.10.0-beta1
cyrus-imapd-3.10.0-beta2
cyrus-imapd-3.10.0-rc1
cyrus-imapd-3.10.0-rc2
cyrus-imapd-3.10.1
cyrus-imapd-3.10.2
cyrus-imapd-3.10.3
cyrus-imapd-3.11.0-alpha0
cyrus-imapd-3.12.0
cyrus-imapd-3.12.0-alpha0
cyrus-imapd-3.12.0-beta1
cyrus-imapd-3.12.0-beta2
cyrus-imapd-3.12.0-rc1
cyrus-imapd-3.12.1
cyrus-imapd-3.12.2
cyrus-imapd-3.12.3
cyrus-imapd-3.3.0
cyrus-imapd-3.3.0-dev0
cyrus-imapd-3.3.1
cyrus-imapd-3.5.0-alpha0
cyrus-imapd-3.7.0-alpha0
cyrus-imapd-3.8.0
cyrus-imapd-3.8.0-alpha0
cyrus-imapd-3.8.0-beta1
cyrus-imapd-3.8.0-beta2
cyrus-imapd-3.8.0-rc1
cyrus-imapd-3.8.1
cyrus-imapd-3.8.2
cyrus-imapd-3.8.3
cyrus-imapd-3.8.4
cyrus-imapd-3.8.5
cyrus-imapd-3.8.6
cyrus-imapd-3.8.7
cyrus-imapd-3.9.0-alpha0
Other
posttab
pretab

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-61911.json"