CVE-2026-13039 Eventin 4.0.26 - 4.1.15 - Missing Authorization to Unauthenticated Payment Bypass via REST API
Unauthenticated attackers can bypass payment checks to obtain paid event tickets and access by exploiting missing authorization in the REST API.
- 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-2026-13039?
CVE-2026-13039 is a medium-severity missing authorization vulnerability in arraytics Eventin – Event Calendar, Event Registration, Tickets & Booking (AI Powered), published on 10 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The Eventin – Event Calendar, Event Registration, Tickets & Booking (AI Powered) plugin for WordPress is vulnerable to authorization bypass due to a regression in versions from 4.0.26 up to and including 4.1.15. This is due to the plugin not properly verifying that a user is authorized to perform an action in the payment_complete() function of PaymentController.php. This makes it possible for unauthenticated attackers to mark unpaid ticket orders as completed by submitting a fabricated SureCart checkout ID or FluentCart cart hash, granting themselves paid event access, QR-code attendee tickets, and order confirmation emails without making any real payment. The wp_rest nonce required to reach the vulnerable endpoint is embedded in every public event page, meaning no WordPress session or credentials are needed to obtain it. This vulnerability represents a regression — the same function and endpoint were previously patched but the fix did not persist through subsequent releases.
Weakness: CWE-862
Which versions are affected by CVE-2026-13039?
How do I fix CVE-2026-13039?
No fix has been published for CVE-2026-13039 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-2026-13039 being exploited?
There is no known exploitation of CVE-2026-13039 in the wild and no public exploit code.
Sources
Also known as GHSA-xcc9-4v86-gf8f.