{"affected":[{"defaultStatus":"unaffected","ecosystem":"golang","packageName":"github.com/knadh/listmonk","product":"listmonk","source":"CNA: VulnCheck","vendor":"knadh","versions":[{"lessThan":"7.0.0-beta.2","status":"affected","version":"6.2.0","versionType":"semver"}]}],"cveId":"CVE-2026-128334","cwes":["CWE-636"],"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.","epss":null,"exploits":[],"kev":null,"metrics":[{"score":6.3,"severity":"medium","source":"CNA: VulnCheck","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","version":"4.0"},{"score":4.8,"severity":"medium","source":"CNA: VulnCheck","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L","version":"3.1"},{"score":6.3,"severity":"medium","source":"NVD: disclosure@vulncheck.com","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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","version":"4.0"},{"score":4.8,"severity":"medium","source":"NVD: disclosure@vulncheck.com","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L","version":"3.1"}],"modifiedAt":1794565093513,"publishedAt":1794562420800,"references":[{"source":"CNA: VulnCheck","tags":["patch"],"url":"https://github.com/knadh/listmonk/commit/0c155bd2663d9ec8053ac0d1ab63f021fbb5a0dc"},{"source":"CNA: VulnCheck","tags":["release-notes"],"url":"https://github.com/knadh/listmonk/releases/tag/v7.0.0-beta.2"},{"source":"CNA: VulnCheck","tags":["technical-description"],"url":"https://github.com/knadh/listmonk/blob/v7.0.0-beta.1/internal/bounce/webhooks/azure.go#L141-L149"},{"source":"CNA: VulnCheck","tags":["issue-tracking"],"url":"https://github.com/biofool/listmonk/issues/5"},{"source":"CNA: VulnCheck","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"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/biofool/listmonk/issues/5"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/knadh/listmonk/blob/v7.0.0-beta.1/internal/bounce/webhooks/azure.go#L141-L149"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/knadh/listmonk/commit/0c155bd2663d9ec8053ac0d1ab63f021fbb5a0dc"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/knadh/listmonk/releases/tag/v7.0.0-beta.2"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://www.vulncheck.com/advisories/listmonk-6.2.0-before-7.0.0-beta.2-missing-authentication-via-azure-bounce-webhook"}],"remediation":[{"kind":"fix","source":"CNA: VulnCheck","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://github.com/knadh/listmonk/commit/0c155bd2663d9ec8053ac0d1ab63f021fbb5a0dc"}],"revision":"e3e57b5818aedf2d1256abb314756177e71a4dac65f8daff7b9c15e378063f84","sources":[{"modifiedAt":1794562420800,"name":"CNA: VulnCheck","retrievedAt":1794564864058,"url":"https://www.cve.org/CVERecord?id=CVE-2026-128334"},{"modifiedAt":1794565093513,"name":"NVD","retrievedAt":1794572257907,"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-128334"}],"ssvc":null,"status":"published","title":"listmonk 6.2.0 before 7.0.0-beta.2 Missing Authentication via Azure Bounce Webhook","updatedAt":1794572257907}