{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-42346", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-04-26T13:26:14.515Z", "datePublished": "2026-05-08T22:26:50.501Z", "dateUpdated": "2026-05-08T22:26:50.501Z"}, "containers": {"cna": {"title": "Postiz: TOCTOU DNS rebinding bypasses all SSRF URL validation paths", "problemTypes": [{"descriptions": [{"cweId": "CWE-918", "lang": "en", "description": "CWE-918: Server-Side Request Forgery (SSRF)", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N", "version": "3.1"}}], "references": [{"name": "https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-f7jj-p389-4w45", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-f7jj-p389-4w45"}, {"name": "https://github.com/gitroomhq/postiz-app/commit/071143dcb01cdeb9d5d7019892f4c6ff7b19dbeb", "tags": ["x_refsource_MISC"], "url": "https://github.com/gitroomhq/postiz-app/commit/071143dcb01cdeb9d5d7019892f4c6ff7b19dbeb"}, {"name": "https://github.com/gitroomhq/postiz-app/releases/tag/v2.21.7", "tags": ["x_refsource_MISC"], "url": "https://github.com/gitroomhq/postiz-app/releases/tag/v2.21.7"}], "affected": [{"vendor": "gitroomhq", "product": "postiz-app", "versions": [{"version": ">= 2.16.6, < 2.21.7", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-05-08T22:26:50.501Z"}, "descriptions": [{"lang": "en", "value": "Postiz is an AI social media scheduling tool. From version 2.16.6 to before version 2.21.7, all SSRF protections added in v2.21.4\u2013v2.21.6 share a fundamental TOCTOU (Time-of-Check-Time-of-Use) vulnerability: isSafePublicHttpsUrl() resolves DNS to validate the target IP, but subsequent fetch() calls resolve DNS independently. An attacker controlling a DNS server can exploit this gap via DNS rebinding to redirect requests to internal network addresses. This issue has been patched in version 2.21.7."}], "source": {"advisory": "GHSA-f7jj-p389-4w45", "discovery": "UNKNOWN"}}}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "Postiz is an AI social media scheduling tool. From version 2.16.6 to before version 2.21.7, all SSRF protections added in v2.21.4\u2013v2.21.6 share a fundamental TOCTOU (Time-of-Check-Time-of-Use) vulnerability: isSafePublicHttpsUrl() resolves DNS to validate the target IP, but subsequent fetch() calls resolve DNS independently. An attacker controlling a DNS server can exploit this gap via DNS rebinding to redirect requests to internal network addresses. This issue has been patched in version 2.21.7."}], "id": "CVE-2026-42346", "lastModified": "2026-05-08T23:16:37.903", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 4.2, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-05-08T23:16:37.903", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/gitroomhq/postiz-app/commit/071143dcb01cdeb9d5d7019892f4c6ff7b19dbeb"}, {"source": "security-advisories@github.com", "url": "https://github.com/gitroomhq/postiz-app/releases/tag/v2.21.7"}, {"source": "security-advisories@github.com", "url": "https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-f7jj-p389-4w45"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-918"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[2.16.6,2.21.7)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "postiz-app", "source": "cna", "vendor": "gitroomhq"}, "product": "postiz-app", "vendor": "gitroomhq"}], "created": "2026-05-08T23:30:15.078773+00:00", "updated": "2026-05-09T00:00:25.460819+00:00", "vendors": ["gitroomhq", "gitroomhq$PRODUCT$postiz-app"]}