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CVE-2026-50281— Craft CMS: Mass assignment via id in newAttributes during bulk duplicate overwrites existing elements

Quick assessment

Affected
craftcms cms
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

CraftCMS cms是CraftCMS的内容管理系统。 Craft CMS 5.7.0版本和5.9.21之前版本存在输入验证错误漏洞，该漏洞源于批量复制元素操作中存在批量赋值缺陷，攻击者通过newAttributes请求参数提交任意id，导致攻击者的属性写入受害者的现有条目行。以下版本受到影响：5.7.0版本，5.9.21之前版本。

AI Predicted 8.1 Difficulty: Easy EPSS 0.43% · P37

Possible ATT&CK Techniques 1 AI

T1136 · Create Account

Affected Version Matrix 1

VendorProduct Version RangeStatus
craftcms cms >= 5.7.0, < 5.9.21 affected
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I. Basic Information for CVE-2026-50281

Vulnerability Information
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Vulnerability Title
Craft CMS: Mass assignment via id in newAttributes during bulk duplicate overwrites existing elements
Source: CVE Program / CVE List V5
Vulnerability Description
Craft CMS is a content management system (CMS). Versions 5.7.0 and above, prior to 5.9.21 contain a mass-assignment flaw in the bulk-duplicate element action. An attacker who is only able to duplicate their own entires can submit an arbitrary id through the newAttributes request parameter. The duplication routine overrides its own id = null reset with that value and writes the attacker's attributes into the victim's existing entry row. ElementsController::beforeAction() pulls the request body into $this->_attributes and rejects requests that ship an id or canonicalId key at the top level, actionBulkDuplicate(), reads a separate newAttributes array and passes it straight through to the service layer. Elements::duplicateElement() clones the source element, sets id to null, and then hands the attacker's array to Craft::configure(), which overwrites the reset id with any numeric value inside $newAttributes. PHP Yii's saveElement() then performs an UPDATE against the row with that primary key instead of an INSERT. The attackers's title, slug, authorId, postDate, and UID land on the victim's entry. safeAttributes() on Entry includes id because the base element model exposes it, so the Collection::only() filter does not strip it. This issue has been fixed in version 5.9.21.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-915
Source: CVE Program / CVE List V5
Vulnerability Title
Craft CMS 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
CraftCMS cms是CraftCMS的内容管理系统。 Craft CMS 5.7.0版本和5.9.21之前版本存在输入验证错误漏洞，该漏洞源于批量复制元素操作中存在批量赋值缺陷，攻击者通过newAttributes请求参数提交任意id，导致攻击者的属性写入受害者的现有条目行。以下版本受到影响：5.7.0版本，5.9.21之前版本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
craftcms cms >= 5.7.0, < 5.9.21 -

II. Public POCs for CVE-2026-50281

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III. Intelligence Information for CVE-2026-50281

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Patches & Fixes for CVE-2026-50281 (1)

Vendor Advisories for CVE-2026-50281 (1)

IV. Related Vulnerabilities

Same product: cms
Same vendor: craftcms
Same weakness: CWE-915