CVE-2026-42193CRITICAL 9.1EPSS p2.7%

CVE-2026-42193CVE-2026-42193

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.

Scoring

CVSS 3.19.1 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
EPSS0.13% probability of exploitation · percentile 2.7% · 2026-06-17T12:03:21Z
Published2026-05-08
Last modified2026-05-12

Underlying weaknesses· 1

CWE-347

References

  1. https://github.com/useplunk/plunk/releases/tag/v0.9.0
  2. https://github.com/useplunk/plunk/security/advisories/GHSA-9792-w86v-gx53

1

TypeTargetConfidenceTier
WeaknessImproper Verification of Cryptographic Signaturecwe-3470%live

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.