abraxas/cve-2026-75816Proof-of-concept and lab reproduction for CVE-2026-75816, an unauthenticated WordPress Frontend Admin account takeover via admin-ajax form submission.
abraxaslabs.tech · github.com/abraxas · @abraxas_null · CVE-2026-75816
Frontend Admin by DynamiApps 3.29.11 — shabti
The Frontend Admin by DynamiApps plugin for WordPress is vulnerable to Authentication Bypass to Account Takeover in all versions up to, and including, 3.29.12. This is due to the pre_update_value function lacking any capability or ownership check, and ActionPost::conditions_logic() short-circuiting its current_user_can('edit_post') authorization gate whenever the post ID is non-numeric — such as the string user_1 — allowing unauthenticated form submissions to be routed to arbitrary user records without restriction. This makes it possible for unauthenticated attackers to overwrite any user's registered email address, including an administrator's, and then leverage WordPress's native password-reset flow to fully take over the targeted account.
| CVE | CVE-2026-75816 · CVE.org |
| CWE | CWE-287 |
| CVSS | Critical: 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| Product | Frontend Admin by DynamiApps |
| Affected | all versions through 3.29.11 (NVD lists 3.29.12; 3.29.12 added the Email-field edit_user check) |
| Patched | 3.29.12 and later |
| Auth | none (see source map) |
| License | GNU Affero GPL v3.0 |
| Lab | 127.0.0.1 only · vendor/client disclosure pack, not a scanner |
pre_update_value is the sink, not an ajax action= of that name. HTTP is admin-ajax.php action=frontend_admin/form_submit. Object id is user_1 in _acf_objects, not a numeric post id.
POST/wp-admin/admin-ajax.phpGET /fea-lab/ harvest _acf_form _acf_nonce _acf_objects field keyPOST /wp-admin/admin-ajax.php action=frontend_admin/form_submit acff[post][field][email protected]check_submit_form nopriv + who_can_see=allget_form_data fea_decrypt(_acf_objects) record[post]=user_1ActionPost::conditions_logic !is_numeric(user_1) skip edit_postActionPost::run metas acf_update_value value, user_1, user_email fielduser_email::pre_update_value explode user_ wp_update_user ID=1 [email protected]GET /?fea_lab_email=1 body is that addressGET /?fea_lab_email=1 body is [email protected]. Generic form HTML or [email protected] is not it.
Do this first: Update Frontend Admin by DynamiApps to 3.29.12 or newer (current is 3.29.13).
Verify after upgrade
CVE-2026-75816-Abraxas-Labs.py against the patched build: the mapped witness must not appear.If you cannot update immediately
Target only http://127.0.0.1:8088 (or the loopback you bound). Do not point this script at the internet.
python3 CVE-2026-75816-Abraxas-Labs.py
Success is the witness above in the response body. Generic 200 HTML is not it.
Loopback stack used to reproduce. Official images unless a Dockerfile in this folder builds from source.
cd lab
docker compose up --force-recreate
Bind the vulnerable product tree next to Compose if the YAML mounts a local directory (plugin zip / source tag from the version table). Publish nothing except 127.0.0.1.
plugins.trac.wordpress.org/changeset/3664865/acf-frontend-form-element
www.wordfence.com/threat-intel/vulnerabilities/id/f1637a3b-7b0f-485d-9d19-4f711f8c671b?source=cve
Plugin directory: acf-frontend-form-element
Trac browser: plugins.trac.wordpress.org/acf-frontend-form-element
SVN tags: plugins.svn.wordpress.org/acf-frontend-form-element
Abraxas Labs: abraxaslabs.tech · github.com/abraxas · @abraxas_null
# CVE-2026-75816 (structured records)
- input: `https://nvd.nist.gov/vuln/detail/CVE-2026-75816`
- CWE: CWE-287
- published: 2026-09-06T03:17:16.607
## NVD description
The Frontend Admin by DynamiApps plugin for WordPress is vulnerable to Authentication Bypass to Account Takeover in all versions up to, and including, 3.29.12. This is due to the pre_update_value function lacking any capability or ownership check, and ActionPost::conditions_logic() short-circuiting its current_user_can('edit_post') authorization gate whenever the post ID is non-numeric — such as the string user_1 — allowing unauthenticated form submissions to be routed to arbitrary user records without restriction. This makes it possible for unauthenticated attackers to overwrite any user's registered email address, including an administrator's, and then leverage WordPress's native password-reset flow to fully take over the targeted account.
## MITRE description
The Frontend Admin by DynamiApps plugin for WordPress is vulnerable to Authentication Bypass to Account Takeover in all versions up to, and including, 3.29.12. This is due to the pre_update_value function lacking any capability or ownership check, and ActionPost::conditions_logic() short-circuiting its current_user_can('edit_post') authorization gate whenever the post ID is non-numeric — such as the string user_1 — allowing unauthenticated form submissions to be routed to arbitrary user records without restriction. This makes it possible for unauthenticated attackers to overwrite any user's registered email address, including an administrator's, and then leverage WordPress's native password-reset flow to fully take over the targeted account.
## Affected
- shabti Frontend Admin by DynamiApps 0 affected
## References (JSON sources only)
- https://plugins.trac.wordpress.org/browser/acf-frontend-form-element/tags/3.29.10/main/frontend/fields/user/class-user-email.php#L127
- https://plugins.trac.wordpress.org/browser/acf-frontend-form-element/tags/3.29.10/main/frontend/forms/actions/post.php#L1001
- https://plugins.trac.wordpress.org/browser/acf-frontend-form-element/tags/3.29.10/main/frontend/forms/actions/post.php#L1224
- https://plugins.trac.wordpress.org/browser/acf-frontend-form-element/tags/3.29.10/main/frontend/forms/classes/display.php#L26
- https://plugins.trac.wordpress.org/browser/acf-frontend-form-element/tags/3.29.10/main/frontend/forms/classes/submit.php#L125
- https://plugins.trac.wordpress.org/changeset/3664865/acf-frontend-form-element
- https://www.wordfence.com/threat-intel/vulnerabilities/id/f1637a3b-7b0f-485d-9d19-4f711f8c671b?source=cve
- https://github.com/advisories/GHSA-pv54-wq7v-wf7v
- https://nvd.nist.gov/vuln/detail/CVE-2026-75816
## GitHub advisory
The Frontend Admin by DynamiApps plugin for WordPress is vulnerable to Authentication Bypass to...
The Frontend Admin by DynamiApps plugin for WordPress is vulnerable to Authentication Bypass to Account Takeover in all versions up to, and including, 3.29.12. This is due to the pre_update_value function lacking any capability or ownership check, and ActionPost::conditions_logic() short-circuiting its current_user_can('edit_post') authorization gate whenever the post ID is non-numeric — such as the string user_1 — allowing unauthenticated form submissions to be routed to arbitrary user records without restriction. This makes it possible for unauthenticated attackers to overwrite any user's registered email address, including an administrator's, and then leverage WordPress's native password-reset flow to fully take over the targeted account.
This disclosure pack is licensed under the GNU Affero General Public License v3.0. See LICENSE.
This pack is for the vendor, the site owner, and licensed labs. The script talks to 127.0.0.1. Using it against systems you do not own is not authorized by Abraxas Labs. No warranty.