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Vulnerability details: VCID-76k8-sveq-3qbf
Vulnerability ID VCID-76k8-sveq-3qbf
Aliases CVE-2026-28781
GHSA-2xfc-g69j-x2mp
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.
Status Published
Exploitability 0.5
Weighted Severity 6.4
Risk 3.2
Affected and Fixed Packages Package Details
Weaknesses (4)
CWE-639 Authorization Bypass Through User-Controlled Key
CWE-915 Improperly Controlled Modification of Dynamically-Determined Object Attributes
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
epss 0.0005 https://api.first.org/data/v1/epss?cve=CVE-2026-28781
epss 0.0005 https://api.first.org/data/v1/epss?cve=CVE-2026-28781
epss 0.0005 https://api.first.org/data/v1/epss?cve=CVE-2026-28781
cvssv3.1_qr MODERATE https://github.com/advisories/GHSA-2xfc-g69j-x2mp
cvssv4 5.7 https://github.com/craftcms/cms
generic_textual MODERATE https://github.com/craftcms/cms
cvssv4 5.7 https://github.com/craftcms/cms/commit/830b403870cd784b47ae42a3f5a16e7ac2d7f5a8
cvssv4 7.1 https://github.com/craftcms/cms/commit/830b403870cd784b47ae42a3f5a16e7ac2d7f5a8
generic_textual MODERATE https://github.com/craftcms/cms/commit/830b403870cd784b47ae42a3f5a16e7ac2d7f5a8
ssvc Track https://github.com/craftcms/cms/commit/830b403870cd784b47ae42a3f5a16e7ac2d7f5a8
cvssv4 5.7 https://github.com/craftcms/cms/commit/c6dcbdffaf6ab3ffe77d317336684d83699f4542
cvssv4 7.1 https://github.com/craftcms/cms/commit/c6dcbdffaf6ab3ffe77d317336684d83699f4542
generic_textual MODERATE https://github.com/craftcms/cms/commit/c6dcbdffaf6ab3ffe77d317336684d83699f4542
ssvc Track https://github.com/craftcms/cms/commit/c6dcbdffaf6ab3ffe77d317336684d83699f4542
cvssv3.1_qr MODERATE https://github.com/craftcms/cms/security/advisories/GHSA-2xfc-g69j-x2mp
cvssv4 5.7 https://github.com/craftcms/cms/security/advisories/GHSA-2xfc-g69j-x2mp
cvssv4 7.1 https://github.com/craftcms/cms/security/advisories/GHSA-2xfc-g69j-x2mp
generic_textual MODERATE https://github.com/craftcms/cms/security/advisories/GHSA-2xfc-g69j-x2mp
ssvc Track https://github.com/craftcms/cms/security/advisories/GHSA-2xfc-g69j-x2mp
cvssv4 5.7 https://nvd.nist.gov/vuln/detail/CVE-2026-28781
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2026-28781
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2026-28781
830b403870cd784b47ae42a3f5a16e7ac2d7f5a8 https://github.com/craftcms/cms/commit/830b403870cd784b47ae42a3f5a16e7ac2d7f5a8
c6dcbdffaf6ab3ffe77d317336684d83699f4542 https://github.com/craftcms/cms/commit/c6dcbdffaf6ab3ffe77d317336684d83699f4542
CVE-2026-28781 https://nvd.nist.gov/vuln/detail/CVE-2026-28781
GHSA-2xfc-g69j-x2mp https://github.com/advisories/GHSA-2xfc-g69j-x2mp
GHSA-2xfc-g69j-x2mp https://github.com/craftcms/cms/security/advisories/GHSA-2xfc-g69j-x2mp
No exploits are available.
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P Found at https://github.com/craftcms/cms
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P Found at https://github.com/craftcms/cms/commit/830b403870cd784b47ae42a3f5a16e7ac2d7f5a8
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N Found at https://github.com/craftcms/cms/commit/830b403870cd784b47ae42a3f5a16e7ac2d7f5a8
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: SSVCv2/E:P/A:N/T:P/P:M/B:A/M:M/D:T/2026-03-04T17:36:36Z/ Found at https://github.com/craftcms/cms/commit/830b403870cd784b47ae42a3f5a16e7ac2d7f5a8
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P Found at https://github.com/craftcms/cms/commit/c6dcbdffaf6ab3ffe77d317336684d83699f4542
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N Found at https://github.com/craftcms/cms/commit/c6dcbdffaf6ab3ffe77d317336684d83699f4542
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: SSVCv2/E:P/A:N/T:P/P:M/B:A/M:M/D:T/2026-03-04T17:36:36Z/ Found at https://github.com/craftcms/cms/commit/c6dcbdffaf6ab3ffe77d317336684d83699f4542
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P Found at https://github.com/craftcms/cms/security/advisories/GHSA-2xfc-g69j-x2mp
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N Found at https://github.com/craftcms/cms/security/advisories/GHSA-2xfc-g69j-x2mp
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: SSVCv2/E:P/A:N/T:P/P:M/B:A/M:M/D:T/2026-03-04T17:36:36Z/ Found at https://github.com/craftcms/cms/security/advisories/GHSA-2xfc-g69j-x2mp
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P Found at https://nvd.nist.gov/vuln/detail/CVE-2026-28781
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Exploit Prediction Scoring System (EPSS)
Percentile 0.16124
EPSS Score 0.0005
Published At June 11, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-11T16:43:47.014473+00:00 Vulnrichment Import https://github.com/cisagov/vulnrichment/blob/develop/2026/28xxx/CVE-2026-28781.json 38.6.0