dbcve.org
Missing AuthorizationWeakness · CWE-862

CVE-2026-41128

MEDIUM · 5.3 CVSS v4.0 Published 2026-04-22
Patch available
A vendor patch is available. No clean upgrade release — apply the published patch.
See remediation →
59/100
Remediation priority · Elevated
Remotely reachable Zero-click Patch available

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
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.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis
How this class of weakness works · CWE-862

The application checks who you are but not whether you're allowed to perform a given action, so any authenticated user can reach things meant for others. This is the classic “change the ID in the URL” bug. The fix is an authorization check on every request, evaluated against the acting user's permissions.

General guidance for the missing authorization class — the official description and references above are authoritative for this specific CVE. Want a bespoke review and a reviewed fix? Ask our team →

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
Low
Authentication
X
User interaction
None
Scope
X

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Patch available Apply the vendor patch
Vendor patch github.com →
Recommended fix High confidence

Craft CMS 5.9.15 or later

  1. 1. Check the current Craft CMS version by navigating to Utilities > System Report in the admin panel or checking the version file
  2. 2. Confirm the installed version is between 5.6.0 and 5.9.14 (inclusive), which are affected by this vulnerability
  3. 3. Create a complete backup of the database and all project files
  4. 4. Upgrade Craft CMS to version 5.9.15 or later by running the appropriate composer update command (e.g., composer update craftcms/cms --no-interaction) or using the control panel update function if available
  5. 5. Clear all caches after upgrading to ensure the patched code is fully applied
  6. 6. Verify the upgrade was successful by checking the version number
  7. 7. Test that users with only viewUsers permission can no longer remove users from groups (the fix adds authorization check for removals in _saveUserGroups())
Caveat Review the Craft CMS 5.9.15 changelog for any breaking changes between your current version and 5.9.15 before upgrading

Generated from the published advisory — verify against the referenced sources before acting.

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

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