CVE-2026-16587 Missing authorization in Advanced Form Integration — Connect Forms to 200+ Apps
Authenticated subscribers can overwrite MailUp OAuth tokens, hijacking form data or breaking integration due to missing authorization checks.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-16587?
CVE-2026-16587 is a medium-severity missing authorization vulnerability in nasirahmed Advanced Form Integration — Connect Forms to 200+ Apps, published on 28 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The Advanced Form Integration — Connect Forms to 200+ Apps plugin for WordPress is vulnerable to authorization bypass in all versions up to, and including, 2.6.0. This is due to the plugin not properly verifying that a user is authorized to perform an action. This makes it possible for authenticated attackers, with subscriber-level access and above, to overwrite the site's stored MailUp OAuth tokens in the adfoin_mailup_keys option with attacker-controlled tokens, hijacking future form-submission data to a MailUp account they control or nulling the tokens to break the integration entirely. This is exploitable by any authenticated user who can reach /wp-admin/profile.php, as admin_init fires for all logged-in users visiting any wp-admin page.
Weakness: CWE-862
Which versions are affected by CVE-2026-16587?
How do I fix CVE-2026-16587?
No fix has been published for CVE-2026-16587 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-16587 being exploited?
There is no known exploitation of CVE-2026-16587 in the wild and no public exploit code.
Sources
Also known as GHSA-r4fx-q4j5-7gqg.