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  4. CVE 2026 121636 quick event manager 995 918 unauthenticated
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Back to active CVEs
Medium · CVSS 5.3CVE-2026-121636

Quick Event Manager 9.9.5 - 9.18 - Unauthenticated PayPal IPN Verification Bypass via the 'debug' ParameterCVE-2026-121636

Answer in brief

CVE-2026-121636 records a Medium severity (CVSS 5.3) vulnerability in Quick Event Manager 9.9.5 - 9.18 - Unauthenticated PayPal IPN Verification Bypass via the 'debug' Parameter. The current sources do not mark it as known exploited. The current feed maps Unknown/Quick Event Manager (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Nov 6, 2026Updated Nov 6, 2026Source checked Nov 6, 2026First seen by HOL Nov 6, 2026Material review Nov 6, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 5.3
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 5.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Unknown/Quick Event Manager (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Unknown/Quick Event Managergeneric>=9.9.5 <9.199.19

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Unknown/Quick Event Manager.
  2. 2Review the reported fix. Update Unknown/Quick Event Manager to 9.19 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Nov 6, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 6, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Nov 6, 2026

Sources and claim methodology

  • Source referencewpscan.com
Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Order Tracking < 3.6.0 - Unauthenticated Payment Confirmation Forgery via PayPal IPN ListenerAlso CWE-345

Record context

Vulnerability class
Missing Auth
EPSS
Not reported
CWE IDs
CWE-345
Source
CVE List V5
Source checked
Nov 6, 2026
References
1 linked source
Open source record