CVE-2026-34719 Zammad has a Server-side request forgery (SSRF) via webhooks
Attackers can exploit missing validation in Zammad webhooks to access confidential cloud metadata via server-side request forgery.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-34719?
CVE-2026-34719 is a high-severity server-side request forgery vulnerability in Zammad Zammad, published on 8 Apr 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official 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 — 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.
Weakness: CWE-918
Which versions are affected by CVE-2026-34719?
It affects 1 product.
Products include Zammad Zammad.
How do I fix CVE-2026-34719?
No fix has been published for CVE-2026-34719 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-34719 being exploited?
There is no known exploitation of CVE-2026-34719 in the wild and no public exploit code.
Other vulnerabilities in Zammad Zammad
Sources
Also known as GHSA-2vgc-vfh2-rw75.