Mass Assignment Vulnerability in Craft CMS Affects User Authorship Attribution
CVE-2026-28781

7.1HIGH

Key Information:

Vendor

Craftcms

Status
Cms
Vendor
CVE Published:
4 March 2026

What is CVE-2026-28781?

Craft CMS has a vulnerability that allows users with 'Create Entries' permissions to exploit the entry creation process, leading to unauthorized authorship assignments. An attacker can manipulate the authorId parameter in a POST request, enabling them to attribute new entries to any user, including administrators. This poses a significant security risk as it undermines the integrity of content authorship. The issue has been resolved in versions 4.17.0-beta.1 and 5.9.0-beta.1.

Human OS v1.0:
Ageing Is an Unpatched Zero-Day Vulnerability.

Remediate biological technical debt. Prime Ageing uses 95% high-purity SIRT6 activation to maintain genomic integrity and bolster systemic resilience.

Deploy the Patch

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-...
x_refsource_CONFIRM
https://github.com/craftcms/cms/commit/830b403870cd784b47...
x_refsource_MISC
https://github.com/craftcms/cms/commit/c6dcbdffaf6ab3ffe7...
x_refsource_MISC

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

JSON
.