CVE-2026-5427: CWE-862 Missing Authorization in extendthemes Kubio AI Page Builder
The Kubio AI Page Builder WordPress plugin up to version 2. 7. 2 contains a vulnerability that allows authenticated users with Contributor-level access or higher to upload arbitrary files to the media library. This occurs because the plugin's REST API handler does not properly check user capabilities before importing remote files referenced in post content. The vulnerability enables bypassing normal media upload restrictions, potentially allowing unauthorized file uploads. No official patch or remediation guidance is currently confirmed.
AI Analysis
Technical Summary
CVE-2026-5427 is a missing authorization vulnerability (CWE-862) in the Kubio AI Page Builder WordPress plugin by extendthemes, affecting versions up to 2.7.2. The issue arises from insufficient capability checks in the kubio_rest_pre_insert_import_assets() function, which is triggered during REST API post insertions or updates. When posts, pages, templates, or template parts are created or updated via the REST API, Kubio automatically imports files from URLs found in block attributes under the 'kubio' namespace without verifying if the user has the 'upload_files' capability. This allows authenticated users with Contributor or higher roles to upload arbitrary files to the WordPress media library, bypassing normal upload restrictions. The vulnerability has a CVSS 3.1 base score of 5.3 (medium severity). There is no vendor advisory or patch currently available to confirm remediation status.
Potential Impact
Authenticated users with Contributor-level access or higher can bypass WordPress's standard media upload restrictions and upload arbitrary files to the media library. This could lead to unauthorized content being added to the site, potentially facilitating further attacks or misuse of the media library. There is no indication of direct confidentiality or availability impact, but integrity is affected due to unauthorized file uploads.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict Contributor-level user permissions where possible and monitor for unusual media uploads. Avoid granting upload capabilities to untrusted users. Review and limit REST API access as a temporary mitigation.
CVE-2026-5427: CWE-862 Missing Authorization in extendthemes Kubio AI Page Builder
Description
The Kubio AI Page Builder WordPress plugin up to version 2. 7. 2 contains a vulnerability that allows authenticated users with Contributor-level access or higher to upload arbitrary files to the media library. This occurs because the plugin's REST API handler does not properly check user capabilities before importing remote files referenced in post content. The vulnerability enables bypassing normal media upload restrictions, potentially allowing unauthorized file uploads. No official patch or remediation guidance is currently confirmed.
CVSS v3.1
Score 5.3medium
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-5427 is a missing authorization vulnerability (CWE-862) in the Kubio AI Page Builder WordPress plugin by extendthemes, affecting versions up to 2.7.2. The issue arises from insufficient capability checks in the kubio_rest_pre_insert_import_assets() function, which is triggered during REST API post insertions or updates. When posts, pages, templates, or template parts are created or updated via the REST API, Kubio automatically imports files from URLs found in block attributes under the 'kubio' namespace without verifying if the user has the 'upload_files' capability. This allows authenticated users with Contributor or higher roles to upload arbitrary files to the WordPress media library, bypassing normal upload restrictions. The vulnerability has a CVSS 3.1 base score of 5.3 (medium severity). There is no vendor advisory or patch currently available to confirm remediation status.
Potential Impact
Authenticated users with Contributor-level access or higher can bypass WordPress's standard media upload restrictions and upload arbitrary files to the media library. This could lead to unauthorized content being added to the site, potentially facilitating further attacks or misuse of the media library. There is no indication of direct confidentiality or availability impact, but integrity is affected due to unauthorized file uploads.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict Contributor-level user permissions where possible and monitor for unusual media uploads. Avoid granting upload capabilities to untrusted users. Review and limit REST API access as a temporary mitigation.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Wordfence
- Date Reserved
- 2026-04-02T14:24:35.903Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69e1b7b882d89c981f6ce757
Added to database: 4/17/2026, 4:31:52 AM
Last enriched: 4/24/2026, 4:16:13 PM
Last updated: 5/31/2026, 3:08:34 PM
Views: 82
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