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CVE

CVE-2026-42193

Plunk: SNS webhook forgery
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CVE

CVE-2026-42193

Plunk: SNS webhook forgery

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.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.1
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
C
H
U
-

Related Resources

No items found.

References

https://github.com/useplunk/plunk/releases/tag/v0.9.0, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42193.json, https://github.com/useplunk/plunk/security/advisories/GHSA-9792-w86v-gx53, https://nvd.nist.gov/vuln/detail/CVE-2026-42193

Severity

9.1

CVSS Score
0
10

Basic Information

Base CVSS
9.1
EPSS Probability
0.00127%
EPSS Percentile
0.02817%
Introduced Version
0
Fix Available
e450ae62a3da4a4fdb5f8e2c04c17bd378a800ca

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