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Advisories

listmonk 6.2.0 before 7.0.0-beta.2 Missing Authentication via Azure Bounce Webhook

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Severity
medium
Date
Affecting

  • listmonk >= 6.2.0, < 7.0.0-beta.2

CWE
  • CWE-636 Not Failing Securely ('Failing Open')
CVSS
6.3
CVSS V4 Vector
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
Credit
Komiljon Ayubov, Kenneth Kron, Kailash Nadh
Description
listmonk 6.2.0 before 7.0.0-beta.2 contains a missing authentication vulnerability that allows unauthenticated attackers to submit Azure Event Grid bounce webhooks when no shared secret is configured. Attackers can POST forged EmailDeliveryReportReceived events with Bounced status to /webhooks/service/azure to blocklist, unsubscribe, or delete arbitrary subscribers.

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