CVE-2026-34719 HIGH

CVE-2026-34719: Zammad has a Server-side request forgery (SSRF) via webhooks

Vendor Zammad
Product zammad
Weakness CWE-918 · SSRF
Published April 8, 2026
Last update April 10, 2026
View on NVD All CVEs

CVSS base score

8.3/10
Attack vector Network
Attack complexity Low
Privileges required High
User interaction None
Confidentiality —
Integrity —

CVSS 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

What the vulnerability does

01Description

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 — 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.

Key dates

02Disclosure timeline

April 8, 2026 CVE published
April 10, 2026 Record updated

Related vulnerabilities

04Related CVE

CVE-2026-27945 ZITADEL has potential SSRF via Actions CVE-2026-6573 PHPEMS Instant Exam Creation exams.master.php temppage server-side request forgery CVE-2024-12237 Photo Gallery Slideshow & Masonry Tiled Gallery <= 1.0.15 - Authenticated (Subscriber+) Limited Server-Side Request Forgery CVE-2024-32955 WordPress FV Flowplayer Video Player plugin <= 7.5.43.7212 - Server Side Request Forgery (SSRF) vulnerability CVE-2023-33184 Blind SSRF in the Nextcloud Mail app on avatar endpoint