{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-123204", "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "state": "PUBLISHED", "assignerShortName": "VulnCheck", "dateReserved": "2026-11-05T17:58:51.242Z", "datePublished": "2026-11-05T18:16:39.804Z", "dateUpdated": "2026-11-05T18:16:39.804Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "shortName": "VulnCheck", "dateUpdated": "2026-11-05T18:16:39.804Z"}, "datePublic": "2026-10-30T00:00:00.000Z", "title": "Posta before v0.18.0 SSRF via Webhook URL", "descriptions": [{"lang": "en", "value": "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."}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "Server-Side Request Forgery (SSRF)", "cweId": "CWE-918", "type": "CWE"}]}], "affected": [{"vendor": "goposta", "product": "posta", "defaultStatus": "unaffected", "versions": [{"version": "0", "lessThan": "v0.18.0", "status": "affected", "versionType": "custom"}], "packageURL": "pkg:golang/github.com/goposta/posta", "repo": "https://github.com/goposta/posta"}], "metrics": [{"format": "CVSS", "cvssV4_0": {"version": "4.0", "vectorString": "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", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "LOW", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 5.3, "baseSeverity": "MEDIUM"}}, {"format": "CVSS", "cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "availabilityImpact": "NONE", "baseScore": 4.3, "baseSeverity": "MEDIUM"}}], "references": [{"url": "https://github.com/goposta/posta/issues/282", "tags": ["issue-tracking"]}, {"url": "https://github.com/goposta/posta/pull/315", "tags": ["patch", "issue-tracking"]}, {"url": "https://github.com/goposta/posta/commit/6bb376b55dcfdcb979040ed42c4bf57b99e4f46a", "tags": ["patch"]}, {"url": "https://github.com/goposta/posta/releases/tag/v0.18.0", "tags": ["release-notes"], "name": "posta v0.18.0 Release Notes"}, {"url": "https://github.com/goposta/posta/blob/8c3cb6f89c8a992329fac21491c38aed70d05c73/internal/services/webhook/dispatcher.go#L321-L338", "tags": ["technical-description"]}, {"name": "VulnCheck Advisory: Posta before v0.18.0 SSRF via Webhook URL", "tags": ["third-party-advisory"], "url": "https://www.vulncheck.com/advisories/posta-before-0.18.0-ssrf-via-webhook-url"}], "credits": [{"lang": "en", "value": "George Chen", "type": "finder"}, {"lang": "en", "value": "jkaninda", "type": "remediation developer"}], "x_generator": {"engine": "vulncheck-endgame"}}}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "packageURL": "pkg:golang/github.com/goposta/posta", "product": "posta", "repo": "https://github.com/goposta/posta", "vendor": "goposta", "versions": [{"lessThan": "v0.18.0", "status": "affected", "version": "0", "versionType": "custom"}]}], "source": "disclosure@vulncheck.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2026-123204", "lastModified": "2026-11-05T19:17:19.693", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 4.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 1.4, "source": "disclosure@vulncheck.com", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "LOW", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "LOW", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "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", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "disclosure@vulncheck.com", "type": "Secondary"}]}, "published": "2026-11-05T19:17:19.693", "references": [{"source": "disclosure@vulncheck.com", "url": "https://github.com/goposta/posta/blob/8c3cb6f89c8a992329fac21491c38aed70d05c73/internal/services/webhook/dispatcher.go#L321-L338"}, {"source": "disclosure@vulncheck.com", "url": "https://github.com/goposta/posta/commit/6bb376b55dcfdcb979040ed42c4bf57b99e4f46a"}, {"source": "disclosure@vulncheck.com", "url": "https://github.com/goposta/posta/issues/282"}, {"source": "disclosure@vulncheck.com", "url": "https://github.com/goposta/posta/pull/315"}, {"source": "disclosure@vulncheck.com", "url": "https://github.com/goposta/posta/releases/tag/v0.18.0"}, {"source": "disclosure@vulncheck.com", "url": "https://www.vulncheck.com/advisories/posta-before-0.18.0-ssrf-via-webhook-url"}], "sourceIdentifier": "disclosure@vulncheck.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-918"}], "source": "disclosure@vulncheck.com", "type": "Primary"}]}

{"bugzilla": {"description": "github.com/goposta/posta: Posta: Server-side request forgery via arbitrary webhook URLs", "id": "2567435", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2567435"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.3", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N", "status": "draft"}, "cwe": "CWE-918", "details": ["A flaw was found in Posta. An authenticated remote attacker with editing privileges can exploit a Server-Side Request Forgery (SSRF) vulnerability by configuring webhooks with arbitrary URLs. This issue allows the attacker to force the server to send requests to internal destinations, including private network and cloud metadata addresses. By examining delivery status codes and error messages, the attacker can probe internal services and disclose sensitive network information."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability."}, "name": "CVE-2026-123204", "public_date": "2026-11-05T18:16:39Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-123204\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-123204\nhttps://github.com/goposta/posta/blob/8c3cb6f89c8a992329fac21491c38aed70d05c73/internal/services/webhook/dispatcher.go#L321-L338\nhttps://github.com/goposta/posta/commit/6bb376b55dcfdcb979040ed42c4bf57b99e4f46a\nhttps://github.com/goposta/posta/issues/282\nhttps://github.com/goposta/posta/pull/315\nhttps://github.com/goposta/posta/releases/tag/v0.18.0\nhttps://www.vulncheck.com/advisories/posta-before-0.18.0-ssrf-via-webhook-url"], "statement": "This vulnerability is rated as Moderate impact because successful exploitation requires an authenticated account with webhook configuration permissions and is constrained to internal network reconnaissance rather than arbitrary code execution. While the flaw permits an authorized user to direct outgoing HTTP requests toward loopback interfaces, private subnets, or cloud metadata endpoints, exposure is restricted to inferring service reachability through response status codes and connection error messages. Furthermore, Posta is not included or shipped in any Red Hat products.", "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,v0.18.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "posta", "source": "cna", "vendor": "goposta"}, "product": "posta", "vendor": "goposta"}], "created": "2026-11-05T20:00:09.808862+00:00", "updated": "2026-11-06T16:35:30.200800+00:00", "vendors": ["goposta", "goposta$PRODUCT$posta"]}