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CVE-2026-41128— Craft CMS has a Missing Authorization Check on User Group Removal via save-permissions Action

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.

Craft CMS是Craft CMS开源的一套内容管理系统（CMS）。 Craft CMS 5.6.0版本至5.9.14版本存在安全漏洞，该漏洞源于actionSavePermissions端点允许仅具有viewUsers权限的用户从所有用户组中移除任意用户，可能导致权限提升。

AI Predicted 7.5 Difficulty: Easy EPSS 0.36% · P28

Possible ATT&CK Techniques 1 AI

T1078.004 · Cloud Accounts
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I. Basic Information for CVE-2026-41128

Vulnerability Information
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Vulnerability Title
Craft CMS has a Missing Authorization Check on User Group Removal via save-permissions Action
Source: CVE Program / CVE List V5
Vulnerability Description
Craft CMS is a content management system (CMS). In versions 5.6.0 through 5.9.14, the `actionSavePermissions()` endpoint allows a user with only `viewUsers` permission to remove arbitrary users from all user groups. While `_saveUserGroups()` enforces per-group authorization for additions, it performs no equivalent authorization check for removals, so submitting an empty `groups` value removes all existing group memberships. Version 5.9.15 contains a patch.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Craft CMS 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Craft CMS是Craft CMS开源的一套内容管理系统（CMS）。 Craft CMS 5.6.0版本至5.9.14版本存在安全漏洞，该漏洞源于actionSavePermissions端点允许仅具有viewUsers权限的用户从所有用户组中移除任意用户，可能导致权限提升。
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 >= 5.6.0, < 5.9.15 -

II. Public POCs for CVE-2026-41128

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III. Intelligence Information for CVE-2026-41128

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Patches & Fixes for CVE-2026-41128 (1)

Vendor Advisories for CVE-2026-41128 (1)

Same Patch Batch · craftcms · 2026-04-21 · 3 CVEs total

CVE-2026-41130 Craft CMS has a host header injection leading to SSRF via resource-js endpoint
CVE-2026-41129 Craft CMS has Server-Side Request Forgery (SSRF) with Asset Uploads Mutations

IV. Related Vulnerabilities

Same product: cms
Same vendor: craftcms
Same weakness: CWE-862

V. Comments for CVE-2026-41128

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