TI-2026-22976 Aliases CVE-2026-28781 GHSA-2xfc-g69j-x2mp

Craft Affected by Entries Authorship Spoofing via Mass Assignment

MEDIUM 64CWE-639Published 2026-03-04 · Updated 2026-03-04

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Security bypass, Tampering
Confidentiality · integrity · availability: None · High · None
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-639 and CWE-915.

Summary

Craft is a content management system (CMS). Prior to 4.17.0-beta.1 and 5.9.0-beta.1, the entry creation process allows for Mass Assignment of the authorId attribute. A user with "Create Entries" permission can inject the authorIds[] (or authorId) parameter into the POST request, which the backend processes without verifying if the current user is authorized to assign authorship to others. Normally, this field is not present in the request for users without the necessary permissions. By manually adding this parameter, an attacker can attribute the new entry to any user, including Admins. This effectively "spoofs" the authorship. This vulnerability is fixed in 4.17.0-beta.1 and 5.9.0-beta.1.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00388 33rd percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Fixed cms (craftcms): 5.9.0-beta.1, 4.17.0-beta.1craftcms/cms (Packagist): 5.9.0-beta.1, 4.17.0-beta.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Craft CMS	cms	5.0.0-RC1 to before 5.9.0-beta.1; 4.0.0-RC1 to before 4.17.0-beta.1	5.9.0-beta.1, 4.17.0-beta.1	Patch available	CNA
—	craftcms/cms (Packagist)	5.0.0-RC1 to before 5.9.0-beta.1	5.9.0-beta.1	Patch available	GHSA-2xfc-g69j-x2mp
—	craftcms/cms (Packagist)	4.0.0-RC1 to before 4.17.0-beta.1	4.17.0-beta.1	Patch available	GHSA-2xfc-g69j-x2mp

cms VendorCraft CMS Affected 5.0.0-RC1 to before 5.9.0-beta.1; 4.0.0-RC1 to before 4.17.0-beta.1 Fixed in 5.9.0-beta.1, 4.17.0-beta.1 Patch available CNA
craftcms/cms (Packagist) Vendor— Affected 5.0.0-RC1 to before 5.9.0-beta.1 Fixed in 5.9.0-beta.1 Patch available GHSA-2xfc-g69j-x2mp
craftcms/cms (Packagist) Vendor— Affected 4.0.0-RC1 to before 4.17.0-beta.1 Fixed in 4.17.0-beta.1 Patch available GHSA-2xfc-g69j-x2mp

CPE configurations NVD · 7

CPE	Versions	Role	Vendor
cpe:2.3:a:craftcms:craft_cms::::::::	after 4.0.0, before 4.17.0; after 5.0.0, before 5.9.0	Vulnerable	Craft CMS
cpe:2.3:a:craftcms:craft_cms:4.0.0:-::::::	4.0.0	Vulnerable	Craft CMS
cpe:2.3:a:craftcms:craft_cms:4.0.0:rc1::::::	4.0.0 rc1	Vulnerable	Craft CMS
cpe:2.3:a:craftcms:craft_cms:4.0.0:rc2::::::	4.0.0 rc2	Vulnerable	Craft CMS
cpe:2.3:a:craftcms:craft_cms:4.0.0:rc3::::::	4.0.0 rc3	Vulnerable	Craft CMS
cpe:2.3:a:craftcms:craft_cms:5.0.0:-::::::	5.0.0	Vulnerable	Craft CMS
cpe:2.3:a:craftcms:craft_cms:5.0.0:rc1::::::	5.0.0 rc1	Vulnerable	Craft CMS

cpe:2.3:a:craftcms:craft_cms:*:*:*:*:*:*:*:* Versions after 4.0.0, before 4.17.0; after 5.0.0, before 5.9.0 Vulnerable ·Craft CMS
cpe:2.3:a:craftcms:craft_cms:4.0.0:-:*:*:*:*:*:* Versions 4.0.0 Vulnerable ·Craft CMS
cpe:2.3:a:craftcms:craft_cms:4.0.0:rc1:*:*:*:*:*:* Versions 4.0.0 rc1 Vulnerable ·Craft CMS
cpe:2.3:a:craftcms:craft_cms:4.0.0:rc2:*:*:*:*:*:* Versions 4.0.0 rc2 Vulnerable ·Craft CMS
cpe:2.3:a:craftcms:craft_cms:4.0.0:rc3:*:*:*:*:*:* Versions 4.0.0 rc3 Vulnerable ·Craft CMS
cpe:2.3:a:craftcms:craft_cms:5.0.0:-:*:*:*:*:*:* Versions 5.0.0 Vulnerable ·Craft CMS
cpe:2.3:a:craftcms:craft_cms:5.0.0:rc1:*:*:*:*:*:* Versions 5.0.0 rc1 Vulnerable ·Craft CMS

Remediation

Fix · CNA cms (craftcms) Fixed in 5.9.0-beta.1, 4.17.0-beta.1
Fix · GHSA-2xfc-g69j-x2mp craftcms/cms (Packagist) Fixed in 5.9.0-beta.1 Advisory →
Fix · GHSA-2xfc-g69j-x2mp craftcms/cms (Packagist) Fixed in 4.17.0-beta.1 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-28781
2026-10-03 Alias added: GHSA-2xfc-g69j-x2mp

References

Exploit 1

https://github.com/craftcms/cms/security/advisories/GHSA-2xfc-g69j-x2mp

Patch 2

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2026-28781

Other 1

https://github.com/craftcms/cms

TI-2025-23503 Craft CMS Allows Remote Code Execution KEVCVSS 3.1CRITICAL 10.0
TI-2024-37138 RCE when PHP `register_argc_argv` config setting is enabled in craftcms/cms KEVCVSS 4.0CRITICAL 9.3
TI-2025-16994 Potential RCE with a compromised security key in craft/cms KEVCVSS 3.1HIGH 8.1
TI-2025-24595 Craft CMS stores user-provided content in session files KEVCVSS 4.0MEDIUM 6.9
TI-2023-22284 Craft CMS Remote Code Execution vulnerability CVSS 3.1CRITICAL 10.0
TI-2024-25171 Craft CMS up to v3.7.31 was discovered to contain a SQL injection vulnerability via the GraphQL API endpoint. CVSS 3.1CRITICAL 9.8

See all 96 →

Sources

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