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CVE-2026-42193— Plunk: SNS webhook forgery

CVSS 9.1 · Critical
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I. Basic Information for CVE-2026-42193

Vulnerability Information
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Vulnerability Title
Plunk: SNS webhook forgery
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
密码学签名的验证不恰当
Source: NVD (National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
useplunkplunk < 0.9.0 -

II. Public POCs for CVE-2026-42193

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III. Intelligence Information for CVE-2026-42193

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IV. Related Vulnerabilities

Same product: plunk
Same vendor: useplunk
Same weakness: CWE-347

V. Comments for CVE-2026-42193

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