{"affected":[{"defaultStatus":"unaffected","ecosystem":"golang","packageName":"github.com/goposta/posta","product":"posta","source":"CNA: VulnCheck","vendor":"goposta","versions":[{"lessThan":"v0.18.0","status":"affected","version":"0","versionType":"custom"}]}],"cveId":"CVE-2026-123204","cwes":["CWE-918"],"description":"Posta before v0.18.0 contains a server-side request forgery vulnerability that allows authenticated users with edit rights to make the backend send POST requests to internal destinations by creating webhooks with arbitrary URLs. Attackers can target loopback, private-network or cloud metadata addresses and read delivery status codes and error strings to probe internal hosts and ports.","epss":{"date":"2026-11-09","percentile":0.23072,"score":0.00302},"exploits":[],"kev":null,"metrics":[{"score":5.3,"severity":"medium","source":"CNA: VulnCheck","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N","version":"4.0"},{"score":4.3,"severity":"medium","source":"CNA: VulnCheck","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","version":"3.1"},{"score":5.3,"severity":"medium","source":"NVD: disclosure@vulncheck.com","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:L/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":4.3,"severity":"medium","source":"NVD: disclosure@vulncheck.com","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","version":"3.1"}],"modifiedAt":1794246531433,"publishedAt":1793902599804,"references":[{"source":"CNA: VulnCheck","tags":["issue-tracking"],"url":"https://github.com/goposta/posta/issues/282"},{"source":"CNA: VulnCheck","tags":["patch","issue-tracking"],"url":"https://github.com/goposta/posta/pull/315"},{"source":"CNA: VulnCheck","tags":["patch"],"url":"https://github.com/goposta/posta/commit/6bb376b55dcfdcb979040ed42c4bf57b99e4f46a"},{"source":"CNA: VulnCheck","tags":["release-notes"],"url":"https://github.com/goposta/posta/releases/tag/v0.18.0"},{"source":"CNA: VulnCheck","tags":["technical-description"],"url":"https://github.com/goposta/posta/blob/8c3cb6f89c8a992329fac21491c38aed70d05c73/internal/services/webhook/dispatcher.go#L321-L338"},{"source":"CNA: VulnCheck","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/posta-before-0.18.0-ssrf-via-webhook-url"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/goposta/posta/blob/8c3cb6f89c8a992329fac21491c38aed70d05c73/internal/services/webhook/dispatcher.go#L321-L338"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/goposta/posta/commit/6bb376b55dcfdcb979040ed42c4bf57b99e4f46a"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/goposta/posta/issues/282"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/goposta/posta/pull/315"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/goposta/posta/releases/tag/v0.18.0"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://www.vulncheck.com/advisories/posta-before-0.18.0-ssrf-via-webhook-url"}],"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/goposta/posta/pull/315"},{"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/goposta/posta/commit/6bb376b55dcfdcb979040ed42c4bf57b99e4f46a"}],"revision":"2b58116d4d2315655f3fb474f33ef095aeb40f685d1f77f386546e3517132104","sources":[{"modifiedAt":1794246531433,"name":"CNA: VulnCheck","retrievedAt":1794247813665,"url":"https://www.cve.org/CVERecord?id=CVE-2026-123204"},{"modifiedAt":1793906239693,"name":"NVD","retrievedAt":1793946366838,"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-123204"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1794247848601,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-123204"}],"ssvc":{"assessedAt":1794246462698,"automatable":"no","exploitation":"none","source":"ADP: CISA-ADP","technicalImpact":"partial"},"status":"published","title":"Posta before v0.18.0 SSRF via Webhook URL","updatedAt":1794247848601}