Quick Event Manager 9.9.5 — 9.18 - Unauthenticated Unpaid Event Registration Confirmation
CVE-2026-121636Published · Updated Action summary
Affected: 9.9.5 – 9.18Update to 9.19 or newer
All remediation steps- Severity
- Medium5.3
- CVSS
- 5.3CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:NWhat does this vector mean?
AV:NAttack vector- Network
AC:LAttack complexity- Low
PR:NPrivileges required- None
UI:NUser interaction- None
S:UScope- Unchanged
C:NConfidentiality- None
I:LIntegrity- Low
A:NAvailability- None
- Required access
- No account needed
- Exploit prediction (EPSS)
- No score
- CISA KEV
- Not listed
On this page8
Am I affected?
Quick Event Manager quick-event-manager
- Affected9.9.5 – 9.18
- Patched in9.19
Update to 9.19 or newer.
You are affected if you run 9.9.5 – 9.18. Version 9.19 and later are not affected by this issue.
- Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under Quick Event Manager.
- No admin access? Run a passive check of your site. It reads public files only.
- No account is needed to exploit this. Treat any exposed site on an affected version as at risk.
What to do
- Update to version 9.19, or a newer patched version
- Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
- Watch Quick Event Manager to get an email when the next vulnerability is published.
Advisory
Source description from Wordfence Intelligence, credited to Naoki Kawahigashi.
The Quick Event Manager plugin for WordPress is vulnerable to Authentication Bypass in versions 9.9.5 through 9.18. This is due to missing authentication check on the debug code path in the PayPal IPN handler, allowing any unauthenticated request with the ?debug parameter to bypass PayPal verification and have the status treated as VERIFIED. This makes it possible for unauthenticated attackers to mark event registrations as paid without making a payment by sending a crafted request with the debug parameter to bypass PayPal IPN verification.
Exploits & references
Proof-of-concept & detection
No public proof-of-concept or detection template is known for this vulnerability.
Advisories & patches
- Advisorywordfence.com
Related CVEs
More in Quick Event Manager
All 10| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| Medium5.3 | 9.18 - Unauthenticated Information Exposure 8.4.6 – 9.18Update to 9.19 | CVE-2026-82214 | |
| High7.2 | Unauthenticated Stored Cross-Site Scripting ≤9.18Update to 9.19 | CVE-2026-84848 | |
| Medium5.3 | Missing Authorization ≤9.18Update to 9.19 | CVE-2026-84847 | |
| Medium5.5 | Authenticated(Admin+) Stored Cross-Site Scripting ≤9.6.4Update to 9.6.5 | CVE-2022-46863 | |
| High7.2 | Unauthenticated Stored Cross Site Scripting ≤9.7.4Update to 9.7.5 | CVE-2023-23979 |
- Medium5.39.18 - Unauthenticated Information Exposure
8.4.6 – 9.18Update to 9.19
- High7.2Unauthenticated Stored Cross-Site Scripting
≤9.18Update to 9.19
- Medium5.3Missing Authorization
≤9.18Update to 9.19
- Medium5.5Authenticated(Admin+) Stored Cross-Site Scripting
≤9.6.4Update to 9.6.5
- High7.2Unauthenticated Stored Cross Site Scripting
≤9.7.4Update to 9.7.5
Timeline
CVE published
Severity medium, CVSS 5.3
Record last updated
Sources & licenses
Wordfence record- Vulnerability data
- Wordfence Intelligence. [object Object] Licensed under the CC BY-SA 4.0.
- CVE® identifiers
- [object Object]. Used under the CVE Program. CVE® is a registered trademark of The MITRE Corporation.
- CVSS / CWE
- National Vulnerability Database (NVD), shown unmodified. This product uses the NVD API but is not endorsed or certified by the NVD.
- VulnCrest content
- Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.