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 does not properly check user capabilities when importing remote files via the REST API, enabling bypass of normal media upload restrictions. The vulnerability is classified as CWE-862 (Missing Authorization) and has a medium severity rating with a CVSS score of 5. 3. No official patch or remediation guidance is currently available from the vendor.
AI Analysis
Technical Summary
CVE-2026-5427 is a missing authorization vulnerability in the Kubio AI Page Builder WordPress plugin (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. The plugin automatically imports remote files referenced in block attributes without verifying if the user has the 'upload_files' capability. This allows authenticated users with Contributor-level permissions or higher to bypass WordPress's media upload restrictions and upload arbitrary files to the media library, potentially leading to unauthorized content injection.
Potential Impact
Authenticated users with Contributor-level access or above can upload arbitrary files to the WordPress media library, bypassing normal upload restrictions. This could lead to unauthorized content being added to the site, which may facilitate further attacks or content manipulation. 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 released, restrict Contributor-level access and above to trusted users only. Monitor plugin updates from extendthemes for a security patch addressing this vulnerability.
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 does not properly check user capabilities when importing remote files via the REST API, enabling bypass of normal media upload restrictions. The vulnerability is classified as CWE-862 (Missing Authorization) and has a medium severity rating with a CVSS score of 5. 3. No official patch or remediation guidance is currently available from the vendor.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-5427 is a missing authorization vulnerability in the Kubio AI Page Builder WordPress plugin (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. The plugin automatically imports remote files referenced in block attributes without verifying if the user has the 'upload_files' capability. This allows authenticated users with Contributor-level permissions or higher to bypass WordPress's media upload restrictions and upload arbitrary files to the media library, potentially leading to unauthorized content injection.
Potential Impact
Authenticated users with Contributor-level access or above can upload arbitrary files to the WordPress media library, bypassing normal upload restrictions. This could lead to unauthorized content being added to the site, which may facilitate further attacks or content manipulation. 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 released, restrict Contributor-level access and above to trusted users only. Monitor plugin updates from extendthemes for a security patch addressing this vulnerability.
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: 4/17/2026, 4:47:04 AM
Last updated: 4/17/2026, 5:53:01 AM
Views: 5
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.