CVE-2026-84907: Unknown Eventin

Low severity, CVSS 3.7. EPSS: 0.2% chance of exploitation in the next 30 days.

The Eventin WordPress plugin before 4.1.24 does not properly authorise order finalisation when its offline (local) payment method is enabled, relying on a nonce that is exposed to unauthenticated visitors and never checking that the caller owns the order, allowing unauthenticated attackers to reset any existing order and its attendees to a pending state and thereby invalidate paid tickets.

Affected products

• Unknown Eventin: from 4.1.5, before 4.1.24 (fixed in 4.1.24)

Published 2026-09-16. Last modified 2026-09-17.