Zammad has a Server-side request forgery (SSRF) via webhooks_CVE-2026-34719

{
    "lastseen": "",
    "description": "Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.1 and 6.5.4, the webhook model was missing a proper validation for loop back addresses, or link-local addresses \u2014 only the URL scheme (HTTP/HTTPS) as well as the hostname was checked. This could end up in retrieving confidential metadata of cloud/hosting providers. The existing check is now extended and is applied when configuring webhooks as well as triggering webhook jobs. This vulnerability is fixed in 7.0.1 and 6.5.4.",
    "published": "2026-04-08T18:02:16.224Z",
    "modified": "2026-04-10T20:38:50.653Z",
    "type": "cve",
    "title": "Zammad has a Server-side request forgery (SSRF) via webhooks",
    "source": "GitHub_M",
    "references": "https://github.com/zammad/zammad/security/advisories/GHSA-2vgc-vfh2-rw75",
    "id": "CVE-2026-34719",
    "bulletinFamily": "",
    "cwe": [
        "CWE-918"
    ],
    "cvelist": null,
    "sourceData": "zammad zammad < 6.5.4\nzammad zammad >= 7.0.0-alpha, < 7.0.1",
    "sourceHref": "",
    "cvss": {
        "score": 8.3,
        "severity": "HIGH",
        "vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:N/VA:H/SC:L/SI:N/SA:H",
        "version": "4.0"
    },
    "cvss2": [],
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        "privilegesRequired": "",
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        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
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    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "zammad",
    "version": "< 6.5.4",
    "vendor": "zammad",
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}