CVE-2026-41128Network attack vector

Authenticated access revocation via unchecked group removal

Published Apr 21, 2026 · Updated Apr 21, 2026

Missing authorization in Craft CMS 5.6.0 through 5.9.14 allows remote authenticated users to remove users from all groups. actionSavePermissions accepts an empty groups value, and _saveUserGroups deletes existing memberships without checking group-assignment authority. Reachability requires a Pro-or-higher control-panel account with accessCp and viewUsers; targeted users immediately lose group-derived access.

CVSS severity5.3
Medium
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in Craft CMS 5.6.0 through 5.9.14 allows remote authenticated users to remove users from all groups. actionSavePermissions accepts an empty groups value, and _saveUserGroups deletes existing memberships without checking group-assignment authority. Reachability requires a Pro-or-higher control-panel account with accessCp and viewUsers; targeted users immediately lose group-derived access.

The record

CVE
CVE-2026-41128
Published
Apr 21, 2026
Updated
Apr 21, 2026
Vendor
Pixel & Tonic
Product
Craft CMS
Classifications
CWE-862, T1531
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 21, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 5.6.0, < 5.9.15

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Pixel & Tonic · Craft CMSversion=>= 5.6.0, < 5.9.15

Published CVSS scores

5.3GitHub, Inc.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

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization
T1531Account Access Removal

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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