CVE-2026-56726 Zammad: Missing authorization check in GitHub + GitLab integration allows cross-ticket data leak
Authenticated agents can view GitHub/GitLab issue details attached to any ticket, bypassing ticket isolation boundaries.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-56726?
CVE-2026-56726 is a medium-severity missing authorization vulnerability in zammad, published on 25 Sep 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.2, this vulnerability breaks normal ticket isolation boundaries between agents. Any authenticated agent, even one with no active tickets assigned to them, can view the titles, status, labels, and URL links of GitHub/GitLab issues attached to any ticket in the system. This allows an internal user to systematically view GitHub/GitLab issue data linked by other agents or administrators across the organization by simply querying random or sequential ticket IDs. This vulnerability is fixed in 7.0.2.
Weakness: CWE-862
Which versions are affected by CVE-2026-56726?
How do I fix CVE-2026-56726?
No fix has been published for CVE-2026-56726 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-56726 being exploited?
There is no known exploitation of CVE-2026-56726 in the wild and no public exploit code.
Sources
Also known as GHSA-96hh-fmj3-h4hp.