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PatchSiren cyber security CVE debrief

CVE-2026-2826 stellarwp CVE debrief

The Kadence Blocks — Page Builder Toolkit for Gutenberg Editor plugin for WordPress has an authorization bypass vulnerability in all versions up to, and including, 3.6.3. This issue allows authenticated attackers with contributor level access and above to upload images to the WordPress Media Library by supplying remote image URLs that the server downloads and creates as media attachments due to insufficient verification of the `upload_files` capability in the `process_pattern` REST API endpoint.

Vendor
stellarwp
Product
Kadence Blocks — Page Builder Toolkit for Gutenberg Editor
CVSS
MEDIUM 4.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-04-04
Original CVE updated
2026-07-21
Advisory published
2026-04-04
Advisory updated
2026-07-21

Who should care

Administrators and users of the Kadence Blocks — Page Builder Toolkit for Gutenberg Editor plugin for WordPress, especially those with contributor level access and above, should be aware of this vulnerability and take necessary actions to protect their sites.

Technical summary

The vulnerability exists in the `process_pattern` REST API endpoint of the Kadence Blocks — Page Builder Toolkit for Gutenberg Editor plugin. The plugin does not properly verify that a user has the `upload_files` capability, allowing authenticated attackers with contributor level access and above to upload images to the WordPress Media Library by providing remote image URLs. This issue arises from insufficient verification of the `upload_files` capability, potentially leading to unauthorized media uploads. To further investigate, defenders should verify the plugin's current version, review user roles and capabilities, and monitor for suspicious image upload activity.

Defensive priority

Medium priority due to the CVSS score of 4.3 and the potential for authenticated attackers to exploit this vulnerability.

Recommended defensive actions

  • Update the Kadence Blocks — Page Builder Toolkit for Gutenberg Editor plugin to a version that fixes this vulnerability.
  • Restrict access to the `process_pattern` REST API endpoint to users with the `upload_files` capability.
  • Monitor for suspicious activity related to image uploads in the WordPress Media Library.
  • Implement additional security measures such as two-factor authentication and IP whitelisting for WordPress administrators.
  • Review compensating controls for exposed systems while remediation is scheduled and verified.
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review.
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented.

Evidence notes

The CVE record was published on 2026-04-04T09:16:20.167Z and last modified on 2026-07-21T19:10:00.107Z. The NVD entry is currently Deferred. The vulnerability was reported by [email protected]. Evidence is limited to CVE and NVD entries, with no additional technical details provided. Defenders should verify the plugin version and user access controls, and monitor for potential exploitation attempts.

Official resources

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-04-04T09:16:20.167Z and has not been modified since then. The NVD entry is currently Deferred.