CVE-2026-42193 - Vulnerability Analysis
CriticalCVSS: 9.1Last Updated: May 8, 2026
Plunk - Authentication Bypass
Published: May 8, 2026Updated: May 8, 2026Remote Exploitable
Overview
Plunk < 0.9.0 contains an authentication bypass caused by lack of SNS signature, certificate, and topic ARN verification in /webhooks/sns endpoint, letting unauthenticated attackers spoof SNS events to manipulate workflows and metrics, exploit requires no authentication.
Severity & Score
Severity: Critical
CVSS Score: 9.1
Impact
Unauthenticated attackers can spoof SNS events to manipulate workflows, unsubscribe contacts, and exhaust billing credits.
Mitigation
Update to version 0.9.0 or later.
References
Related Resources
Details
- CVE ID
- CVE-2026-42193
- Severity
- Critical
- CVSS Score
- 9.1
- Type
- broken_authentication
- Status
- new
CWE
- CWE-347
CVSS Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H