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CVE-2026-42193

CRITICAL · CVSS 9.1 EPSS 0.02% Public Exploit

Source: NVD + CISA KEV + EPSS · Published: 2026-05-08 · Last synced: 2026-06-07

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Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

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CVE
CVE-2026-42193
Severity
CRITICAL
CVSS
9.1
EPSS
0.02%

Original NVD Description

Plunk is an open-source email platform built on top of AWS SES. Prior to version 0.9.0, the /webhooks/sns endpoint accepts Amazon SNS notification payloads from unauthenticated requests without verifying the SNS signature, certificate, or topic ARN, meaning anyone can forge a valid-looking webhook request. This allows an unauthenticated attacker to spoof SNS events to trigger workflow automations, unsubscribe contacts, manipulate email delivery metrics, and potentially exhaust billing credits. This issue has been patched in version 0.9.0.