Is CVE-2026-28781 in the CISA KEV catalog?

No. CVE-2026-28781 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-28781?

CVE-2026-28781 has a CVSS v3 base score of 6.5 (MEDIUM).

What is the EPSS score for CVE-2026-28781?

CVE-2026-28781 has an EPSS score of 0.33% (24th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-28781?

Upgrade craft cms to 5.9.0 or later.

CVE & CISA-KEV Catalog

CVE-2026-28781

MEDIUM

6.5

CVSS v3

NVD

Description

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.

CWE-639Authorization Bypass Through User-Controlled Key CWE-915

How to fix

Remediation Available

craft cmsNVD

Affected:>= 5.0.0, < 5.9.0Fixed in:5.9.0CVE-2026-28781derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityHigh

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Exploit Intelligence

0.33%probability of exploitation in 30 days

24thpercentile

Low risk: more likely to be exploited than 24% of all known CVEs.

References

Patch3

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-03-05.