CVE-2026-28782 Craft has a Permission Bypass and IDOR in Duplicate Entry Action
Attackers can bypass permissions to duplicate other users' entries via IDOR, leading to unauthorized data access and modification in Craft CMS.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-28782?
CVE-2026-28782 is a medium-severity missing authorization vulnerability in Craftcms Craft Cms, published on 4 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Craft is a content management system (CMS). Prior to 5.9.0-beta.1 and 4.17.0-beta.1, the "Duplicate" entry action does not properly verify if the user has permission to perform this action on the specific target elements. Even with only "View Entries" permission (where the "Duplicate" action is restricted in the UI), a user can bypass this restriction by sending a direct request. Furthermore, this vulnerability allows duplicating other users' entries by specifying their Entry IDs. Since Entry IDs are incremental, an attacker can trivially brute-force these IDs to duplicate and access restricted content across the system. This vulnerability is fixed in 5.9.0-beta.1 and 4.17.0-beta.1.
Weakness: CWE-639
Which versions are affected by CVE-2026-28782?
4 open source packages ship an affected version, including craftcms/cms. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
craftcms/cms Packagist | From 4.0.0-RC1 | 4.17.0-beta.1 |
craftcms/cms Packagist | From 4.0.0-RC1 | 4.17.0-beta.1 |
craftcms/cms Packagist | From 5.0.0-RC1 | 5.9.0-beta.1 |
craftcms/cms Packagist | From 5.0.0-RC1 | 5.9.0-beta.1 |
Products include Craftcms Craft Cms.
How do I fix CVE-2026-28782?
Upgrade craftcms/cms to a fixed version for your release line: 4.17.0-beta.1 or 5.9.0-beta.1.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-28782 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-28782 exists.
Other vulnerabilities in Craftcms Craft Cms
Sources
Also known as GHSA-jxm3-pmm2-9gf6.