CVE-2026-128334

MediumCVSS 4.8/10Last modified Nov 13, 2026

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.

Metrics

CVSS 3.1 4.8/10CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L

Weakness enumeration

CWE-636

Affected software

No affected versions have been published.

Timeline

Published
Nov 13, 2026
Last modified
Nov 13, 2026
NVD status
Deferred

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CVE-2026-128334: Medium severity, CVSS 4.8 | Vulnix