{"id":"CVE-2026-110018","state":"PUBLISHED","title":"aBlocks <= 2.17.0 - Authenticated (Contributor+) Privilege Escalation to 'roleSlug' Block Attribute","description":"The aBlocks – Gutenberg Blocks, User Dashboard Builder, Popup Builder, Form Builder & Animation Builder plugin for WordPress is vulnerable to Privilege Escalation in all versions up to, and including, 2.17.0 via the `/ablocks/v1/form-builder/registration` REST endpoint. The vulnerability exists because the endpoint is registered with `permission_callback => __return_true` and the `register()` handler reads `roleSlug` directly from attacker-controlled block attributes in `post_content` without ever verifying that the block's `formType` is `registration` — a condition that `RegistrationFormSanitizer::verify()` imposes only at save-time, meaning a Contributor can preserve an arbitrary `roleSlug` by saving a block with `formType='login'` and then triggering the endpoint via a valid `wp_rest` nonce and post-ownership check. This makes it possible for authenticated attackers, with Contributor-level access and above, to escalate their WordPress role to Editor or any other non-administrator role and receive a fully authenticated session at the elevated privilege level via `WP_User::set_role()` and `wp_set_auth_cookie()`. Escalation is bounded below administrator-tier roles because `is_safe_registration_role()` rejects any role holding `manage_options`, `edit_users`, `delete_users`, `create_users`, `promote_users`, or `edit_theme_options`, meaning the highest practically reachable role on a standard WordPress installation is Editor.","publishedAt":"2026-10-24T11:30:30.545Z","updatedAt":"2026-10-26T17:40:59.505Z","severity":{"score":8.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"Wordfence"},"assigner":"Wordfence","products":["kodezen aBlocks – Gutenberg Blocks, User Dashboard Builder, Popup Builder, Form Builder & Animation Builder"],"affected":[{"vendor":"kodezen","product":"aBlocks – Gutenberg Blocks, User Dashboard Builder, Popup Builder, Form Builder & Animation Builder","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThanOrEqual":"2.17.0","versionType":"semver"}]}],"references":["https://www.wordfence.com/threat-intel/vulnerabilities/id/6fe7efb5-540b-4d85-852f-ad572da7ecdd?source=cve","https://plugins.trac.wordpress.org/browser/ablocks/tags/2.16.0/includes/api/form-builder-controller.php#L353","https://plugins.trac.wordpress.org/browser/ablocks/tags/2.16.0/includes/api/form-builder-controller.php#L70","https://plugins.trac.wordpress.org/browser/ablocks/tags/2.16.0/includes/api/form-builder-controller.php#L345","https://plugins.trac.wordpress.org/browser/ablocks/tags/2.16.0/includes/blocks/form-builder/block-attr-sanitizer/sanitizers/form-builder/registration-form-sanitizer.php#L28","https://plugins.trac.wordpress.org/browser/ablocks/tags/2.16.0/includes/api/form-builder-controller.php#L685","https://plugins.trac.wordpress.org/changeset?reponame=&old=3756864%40ablocks&new=3756864%40ablocks"],"weaknesses":["CWE-269"],"ingestedAt":"2026-10-29T20:10:33.477Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/110xxx/CVE-2026-110018.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-110018","state":"PUBLISHED","datePublished":"2026-10-24T11:30:30.545Z","dateUpdated":"2026-10-26T17:40:59.505Z","assignerShortName":"Wordfence","assignerOrgId":"b15e7b5b-3da4-40ae-a43c-f7aa60e62599","dateReserved":"2026-10-13T14:56:35.053Z"},"containers":{"cna":{"title":"aBlocks <= 2.17.0 - Authenticated (Contributor+) Privilege Escalation to 'roleSlug' Block Attribute","descriptions":[{"lang":"en","value":"The aBlocks – Gutenberg Blocks, User Dashboard Builder, Popup Builder, Form Builder & Animation Builder plugin for WordPress is vulnerable to Privilege Escalation in all versions up to, and including, 2.17.0 via the `/ablocks/v1/form-builder/registration` REST endpoint. The vulnerability exists because the endpoint is registered with `permission_callback => __return_true` and the `register()` handler reads `roleSlug` directly from attacker-controlled block attributes in `post_content` without ever verifying that the block's `formType` is `registration` — a condition that `RegistrationFormSanitizer::verify()` imposes only at save-time, meaning a Contributor can preserve an arbitrary `roleSlug` by saving a block with `formType='login'` and then triggering the endpoint via a valid `wp_rest` nonce and post-ownership check. This makes it possible for authenticated attackers, with Contributor-level access and above, to escalate their WordPress role to Editor or any other non-administrator role and receive a fully authenticated session at the elevated privilege level via `WP_User::set_role()` and `wp_set_auth_cookie()`. Escalation is bounded below administrator-tier roles because `is_safe_registration_role()` rejects any role holding `manage_options`, `edit_users`, `delete_users`, `create_users`, `promote_users`, or `edit_theme_options`, meaning the highest practically reachable role on a standard WordPress installation is Editor."}],"affected":[{"vendor":"kodezen","product":"aBlocks – Gutenberg Blocks, User Dashboard Builder, Popup Builder, Form Builder & Animation Builder","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThanOrEqual":"2.17.0","versionType":"semver"}]}],"references":[{"url":"https://www.wordfence.com/threat-intel/vulnerabilities/id/6fe7efb5-540b-4d85-852f-ad572da7ecdd?source=cve"},{"url":"https://plugins.trac.wordpress.org/browser/ablocks/tags/2.16.0/includes/api/form-builder-controller.php#L353"},{"url":"https://plugins.trac.wordpress.org/browser/ablocks/tags/2.16.0/includes/api/form-builder-controller.php#L70"},{"url":"https://plugins.trac.wordpress.org/browser/ablocks/tags/2.16.0/includes/api/form-builder-controller.php#L345"},{"url":"https://plugins.trac.wordpress.org/browser/ablocks/tags/2.16.0/includes/blocks/form-builder/block-attr-sanitizer/sanitizers/form-builder/registration-form-sanitizer.php#L28"},{"url":"https://plugins.trac.wordpress.org/browser/ablocks/tags/2.16.0/includes/api/form-builder-controller.php#L685"},{"url":"https://plugins.trac.wordpress.org/changeset?reponame=&old=3756864%40ablocks&new=3756864%40ablocks"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-269","lang":"en","description":"CWE-269 Improper Privilege Management","type":"CWE"}]}],"providerMetadata":{"shortName":"Wordfence","orgId":"b15e7b5b-3da4-40ae-a43c-f7aa60e62599","dateUpdated":"2026-10-24T11:30:30.545Z"},"credits":[{"lang":"en","type":"finder","value":"Wordfence PRISM"}],"timeline":[{"time":"2026-10-21T15:41:41.000Z","lang":"en","value":"Vendor Notified"},{"time":"2026-10-23T21:31:29.000Z","lang":"en","value":"Disclosed"}]},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-10-26T15:40:30.896550Z","id":"CVE-2026-110018","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-26T17:40:59.505Z"}}]}}}