TI-2026-85770 Aliases CVE-2026-121636 GHSA-qm8v-r38g-4hjq

Missing PayPal payment verification in Quick Event Manager plugin

LOW 29CWE-345Published 2026-11-06 · Updated 2026-11-06

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Security bypass
Confidentiality · integrity · availability: None · Low · None
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-345.

Summary

The Quick Event Manager WordPress plugin from 9.9.5 before 9.19 does not verify the authenticity of PayPal payment notifications before marking event registrations as paid (CWE-345). An unauthenticated remote attacker can mark registrations as paid without making a payment. The references include an exploit link.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00114 1st percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by the CNA

Fix Fixed Quick Event Manager (Unknown): 9.19

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Unknown	Quick Event Manager	9.9.5 to before 9.19	9.19	Patch available	CNA

Quick Event Manager VendorUnknown Affected 9.9.5 to before 9.19 Fixed in 9.19 Patch available CNA

Remediation

Update Quick Event Manager to version 9.19, the fixed version.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Fix · CNA Quick Event Manager (Unknown) Fixed in 9.19

Timeline

2026-11-06 Threatist record created from CVE-2026-121636
2026-11-06 Alias added: GHSA-qm8v-r38g-4hjq
2026-11-06 Weakness changed · CISA ADP
2026-11-06 CISA SSVC decision points changed

References

Exploit 1

https://wpscan.com/vulnerability/04b181e1-639c-476f-b66b-2a073bf36829/

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences