CVE-2026-56727

See a problem?
Please try reporting it to the source first.

Source

https://cve.org/CVERecord?id=CVE-2026-56727

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-56727.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-56727

Aliases

GHSA-56jc-34c8-2xq4

Published

2026-09-25T17:02:39Z

Modified

2026-09-27T03:47:27Z

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: PGP signature spoofing via unvalidated verification return

Details

Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.2, summary In Zammad's inbound PGP email processing, the return value of the gpg verification call was silently discarded. Regardless of whether gpg reported a valid, invalid, or missing signature, the handler unconditionally wrote sign: { success: true, comment: "Good signature" } to the article's security preferences. Impact Any sender could tamper with the body of a multipart/signed PGP email, or craft a message with an entirely fabricated or mismatched signature, and Zammad would display it to the recipient as cryptographically verified with a "Good signature" label. Users and agents relying on Zammad's signature indicator to confirm message authenticity and integrity would be misled into trusting modified or forged content. The vulnerability affects all inbound PGP-signed emails processed while the PGP integration is enabled. This issue is fixed in version 7.0.2.

Database specific

{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-287",
        "CWE-347",
        "CWE-391"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/56xxx/CVE-2026-56727.json"
}

References

Affected packages

Git / github.com/zammad/zammad

Affected ranges

Type

GIT

Repo

https://github.com/zammad/zammad

Events

Introduced

Fixed

4a9dd5f8a85948c5a2f96f6479d785153aac05d7

Fixed

9dc15acf239dbc32ec357708859f2d86b188846c

Database specific

Show details

{
    "extracted_events":  [
        {
            "introduced":  "0"
        },
        {
            "fixed":  "7.0.2"
        }
    ],
    "source":  [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

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

7.0.0-alpha

7.0.1

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-56727.json"