Mass-assignment Flaw in Craft CMS Affecting Multiple Versions
CVE-2026-50281

7.1HIGH

Key Information:

Vendor

Craftcms

Status
Cms
Vendor
CVE Published:
2 July 2026

What is CVE-2026-50281?

Craft CMS has a mass-assignment vulnerability in the bulk-duplicate element action, allowing attackers to manipulate attributes within an existing entry. When a user duplicates their own entries, there is a flaw that permits the insertion of arbitrary IDs through the request parameter newAttributes. This leading behavior can overwrite any existing entry data with malicious inputs, presenting a significant security risk. The issue has been addressed in version 5.9.21, which mitigates the flaw by properly handling the request attributes to prevent unauthorized data manipulation.

Affected Version(s)

cms >= 5.7.0, < 5.9.21

References

https://github.com/craftcms/cms/security/advisories/GHSA-...
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https://github.com/craftcms/cms/commit/8f6587c25050bbb6e0...
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CVSS V4

Score:
7.1
Severity:
HIGH
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.