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CVE-2026-42193— Plunk: SNS webhook forgery

Quick assessment

Affected
useplunk plunk
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

plunk是Plunk开源的一个邮件发送与管理平台。 plunk 0.9.0之前版本存在数据伪造问题漏洞，该漏洞源于/webhooks/sns端点接受未经身份验证的请求中的Amazon SNS通知负载而不验证SNS签名、证书或主题ARN，可能导致未经身份验证的攻击者伪造SNS事件触发工作流自动化、取消订阅联系人、操纵电子邮件传递指标并可能耗尽计费积分。

CVSS 9.1 · Critical EPSS 0.21% · P10

Affected Version Matrix 1

VendorProduct Version RangeStatus
useplunk plunk < 0.9.0 affected
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I. Basic Information for CVE-2026-42193

Vulnerability Information
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Vulnerability Title
Plunk: SNS webhook forgery
Source: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
密码学签名的验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
plunk 数据伪造问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
plunk是Plunk开源的一个邮件发送与管理平台。 plunk 0.9.0之前版本存在数据伪造问题漏洞，该漏洞源于/webhooks/sns端点接受未经身份验证的请求中的Amazon SNS通知负载而不验证SNS签名、证书或主题ARN，可能导致未经身份验证的攻击者伪造SNS事件触发工作流自动化、取消订阅联系人、操纵电子邮件传递指标并可能耗尽计费积分。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
useplunk plunk < 0.9.0 -

II. Public POCs for CVE-2026-42193

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 7759 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-42193

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Vendor Advisories for CVE-2026-42193 (1)

Vendor Pages for CVE-2026-42193 (1)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-42193

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