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Security releases

Quick Event Manager

CVE-2026-121636: The Quick Event Manager WordPress plugin before 9.19 does not verify the authenticity of PayPal payment notifications before marking event registrations as paid

CVE-2026-121636 Nov 6, 2026 Source: Vendor

The Quick Event Manager WordPress plugin before 9.19 does not verify the authenticity of PayPal payment notifications before marking event registrations as paid, which could allow unauthenticated attackers to mark registrations as paid without making a payment.

Source of record The credited names below are quoted verbatim from the vendor's own advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-121636
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Credited

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CVE-2026-121636 BR2026-0000-042883 unclaimed
Credited as Naoki Kawahigashi