CVE-2026-56723 Zammad: Missing authorization on ticket attachment download
Customers can bypass article-level restrictions to download attachments from internal ticket articles, exposing sensitive data.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-56723?
CVE-2026-56723 is a high-severity missing authorization vulnerability in zammad, published on 25 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.2, a customer who can view a ticket cannot see internal ticket articles through the article listing API. However, the same customer can directly request an attachment belonging to an internal article via the attachment download endpoint, bypassing article-level authorization. This results in an inconsistency: The article listing hides internal articles from customers. The attachment download only checks the parent ticket, not the article, so the same customer can download the attachment directly. This issue is fixed in version 7.0.2.
Weakness: CWE-863
Which versions are affected by CVE-2026-56723?
How do I fix CVE-2026-56723?
No fix has been published for CVE-2026-56723 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-2026-56723 being exploited?
There is no known exploitation of CVE-2026-56723 in the wild and no public exploit code.