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  4. CVE 2026 128334 listmonk 620 before 700 beta2 missing
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Back to active CVEs
Medium · CVSS 6.3CVE-2026-128334

listmonk 6.2.0 before 7.0.0-beta.2 Missing Authentication via Azure Bounce WebhookCVE-2026-128334

Answer in brief

CVE-2026-128334 records a Medium severity (CVSS 6.3) vulnerability in listmonk 6.2.0 before 7.0.0-beta.2 Missing Authentication via Azure Bounce Webhook. The current sources do not mark it as known exploited. The current feed maps knadh/listmonk (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Nov 13, 2026Updated Nov 13, 2026Source checked Nov 13, 2026First seen by HOL Nov 13, 2026Material review Nov 13, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 6.3
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 6.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps knadh/listmonk (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
knadh/listmonkgeneric>=6.2.0 <7.0.0-beta.27.0.0-beta.2

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for knadh/listmonk.
  2. 2Review the reported fix. Update knadh/listmonk to 7.0.0-beta.2 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Nov 13, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 13, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Nov 13, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • Source referencevulncheck.com
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
Missing Auth
EPSS
Not reported
CWE IDs
CWE-636
Source
CVE List V5
Source checked
Nov 13, 2026
References
5 linked sources
Open source record