CVE-2026-14834 Mailgun for WordPress < 2.2.1 - Unauthenticated Arbitrary Mailgun List Subscription via add_list AJAX
Unauthenticated attackers can add arbitrary email addresses to mailing lists via an unprotected AJAX action, abusing the site owner's API credentials.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-14834?
CVE-2026-14834 is a medium-severity missing authorization vulnerability in Unknown Mailgun for WordPress, published on 31 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The Mailgun for WordPress plugin before 2.2.1 does not perform any capability or nonce check on an unauthenticated AJAX action that adds subscribers to the site owner's configured email service mailing lists, allowing unauthenticated attackers to enrol arbitrary email addresses into those lists using the owner's stored API credentials.
Weakness: CWE-284
Which versions are affected by CVE-2026-14834?
How do I fix CVE-2026-14834?
No fix has been published for CVE-2026-14834 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-2026-14834 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-14834 exists.
Sources
Also known as GHSA-xgf9-46hc-5c98.