CVE-2026-128334 (GCVE-0-2026-128334)

Vulnerability from cvelistv5 – Published: 2026-11-13 09:33 – Updated: 2026-11-13 09:33
VLAI
Title
listmonk 6.2.0 before 7.0.0-beta.2 Missing Authentication via Azure Bounce Webhook
Summary
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.
Severity
6.3 (Medium)
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
4.8 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L
CWE
  • CWE-636 - Not Failing Securely ('Failing Open')
Assigner
VulnCheck CNA
References
Impacted products
Vendor Product Version
knadh listmonk Affected: 6.2.0 , < 7.0.0-beta.2 (semver)
Create a notification for this product.
Date Public
2026-11-01 16:09
Credits
Komiljon Ayubov Kenneth Kron Kailash Nadh
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "packageURL": "pkg:golang/github.com/knadh/listmonk",
          "product": "listmonk",
          "vendor": "knadh",
          "versions": [
            {
              "lessThan": "7.0.0-beta.2",
              "status": "affected",
              "version": "6.2.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Komiljon Ayubov"
        },
        {
          "lang": "en",
          "type": "finder",
          "value": "Kenneth Kron"
        },
        {
          "lang": "en",
          "type": "remediation developer",
          "value": "Kailash Nadh"
        }
      ],
      "datePublic": "2026-11-01T16:09:38.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "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": [
        {
          "cvssV4_0": {
            "attackComplexity": "HIGH",
            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "baseScore": 6.3,
            "baseSeverity": "MEDIUM",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "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",
            "version": "4.0",
            "vulnAvailabilityImpact": "LOW",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "LOW"
          },
          "format": "CVSS"
        },
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 4.8,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L",
            "version": "3.1"
          },
          "format": "CVSS"
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-636",
              "description": "Not Failing Securely (\u0027Failing Open\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-11-13T09:33:40.800Z",
        "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "shortName": "VulnCheck"
      },
      "references": [
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/knadh/listmonk/commit/0c155bd2663d9ec8053ac0d1ab63f021fbb5a0dc"
        },
        {
          "name": "listmonk v7.0.0-beta.2 Release Notes",
          "tags": [
            "release-notes"
          ],
          "url": "https://github.com/knadh/listmonk/releases/tag/v7.0.0-beta.2"
        },
        {
          "tags": [
            "technical-description"
          ],
          "url": "https://github.com/knadh/listmonk/blob/v7.0.0-beta.1/internal/bounce/webhooks/azure.go#L141-L149"
        },
        {
          "tags": [
            "issue-tracking"
          ],
          "url": "https://github.com/biofool/listmonk/issues/5"
        },
        {
          "name": "VulnCheck Advisory: listmonk 6.2.0 before 7.0.0-beta.2 Missing Authentication via Azure Bounce Webhook",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://www.vulncheck.com/advisories/listmonk-6.2.0-before-7.0.0-beta.2-missing-authentication-via-azure-bounce-webhook"
        }
      ],
      "title": "listmonk 6.2.0 before 7.0.0-beta.2 Missing Authentication via Azure Bounce Webhook",
      "x_generator": {
        "engine": "vulncheck-endgame"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
    "cveId": "CVE-2026-128334",
    "datePublished": "2026-11-13T09:33:40.800Z",
    "dateReserved": "2026-11-13T01:20:37.824Z",
    "dateUpdated": "2026-11-13T09:33:40.800Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}



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