CVE-2026-84465

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Source

https://cve.org/CVERecord?id=CVE-2026-84465

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-84465.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-84465

Aliases

GHSA-m9ff-hjr3-93h4

Published

2026-09-25T18:19:58Z

Modified

2026-10-21T03:00:23Z

Severity

7.1 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N CVSS Calculator

Summary

Zammad: S/MIME signature verification allows forged sender impersonation

Details

Zammad is a web based open source helpdesk/customer support system. Prior to 7.1.2, when Zammad checks the digital signature on an incoming S/MIME-signed email, it does not verify that the signing certificate is genuinely trusted, it only checks whether a certificate with a matching name is already stored in the system. An attacker can create their own certificate using the name of a real, previously trusted sender and use it to send a forged email. Zammad will display that email with the same "validly signed" indicator as a genuine message from the real sender, even though the attacker never had access to that sender's actual certificate or private key. This issue is fixed in version 7.1.2.

Database specific

{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-290",
        "CWE-295",
        "CWE-347"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/84xxx/CVE-2026-84465.json"
}

References

Affected packages

Git / github.com/zammad/zammad

Affected ranges

Type

GIT

Repo

https://github.com/zammad/zammad

Events

Introduced

Fixed

7195a4a3e3ba9e801b6ad93f191ae423ed573d15

Fixed

9a07d0b8214ac4e8e10c23fce71d613bd0625524

Database specific

Show details

{
    "extracted_events":  [
        {
            "range":  [
                {
                    "introduced":  "0"
                },
                {
                    "fixed":  "7.1.2"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StringRangeExpression"
        },
        {
            "range":  [
                {
                    "fixed":  "9a07d0b8214ac4e8e10c23fce71d613bd0625524"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        }
    ]
}

Affected versions

1.*

1.6.0

3.*

3.7.0

5.*

5.2.0-alpha

5.3.0-alpha

5.4.0-alpha

5.5.0-alpha

6.*

6.0.0-alpha

6.1.0-alpha

6.2.0-alpha

6.3.0-alpha

6.4.0-alpha

6.5.0-alpha

6.6.0-alpha

7.*

7.0.0-alpha

7.1.0

7.1.0-alpha

7.1.1

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-84465.json"