Access Control Flaw in Craft CMS Enables Unauthorized Content Duplication
CVE-2026-28782

5.3MEDIUM

Key Information:

Vendor

Craftcms

Status
Cms
Vendor
CVE Published:
4 March 2026

What is CVE-2026-28782?

An access control flaw in Craft CMS allows users with minimal permissions to duplicate entries belonging to other users. The issue arises from a lack of proper verification for the 'Duplicate' action, permitting users with only 'View Entries' permission to bypass existing restrictions. Attackers can exploit this by sending direct requests using incremental Entry IDs, making it easy to brute-force and access restricted content. This vulnerability was addressed in versions 5.9.0-beta.1 and 4.17.0-beta.1, which implement enhanced checks for permission validation.

Affected Version(s)

cms >= 5.0.0-RC1, < 5.9.0-beta.1 < 5.0.0-RC1, 5.9.0-beta.1

cms >= 4.0.0-RC1, < 4.17.0-beta.1 < 4.0.0-RC1, 4.17.0-beta.1

References

https://github.com/craftcms/cms/security/advisories/GHSA-...
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https://github.com/craftcms/cms/commit/fb61a91357f5761c85...
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CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.