CVE-2026-42556

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-42556", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-04-28T16:56:50.192Z", "datePublished": "2026-05-08T22:28:33.086Z", "dateUpdated": "2026-05-13T17:46:47.709Z"}, "containers": {"cna": {"title": "Postiz stored XSS in public preview page", "problemTypes": [{"descriptions": [{"cweId": "CWE-79", "lang": "en", "description": "CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 8.9, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:L", "version": "3.1"}}], "references": [{"name": "https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-hhxq-3wg7-4rj8", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-hhxq-3wg7-4rj8"}, {"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": ">= 2.21.6, < 2.21.7", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-05-08T22:28:33.086Z"}, "descriptions": [{"lang": "en", "value": "Postiz is an AI social media scheduling tool. From version 2.21.6 to before version 2.21.7, any authenticated user who can create a post can store arbitrary HTML in post content by tampering their own save request and send the public preview link /p/<postId>?share=true to another user. The preview page renders that stored HTML with dangerouslySetInnerHTML on the main application origin. This issue has been patched in version 2.21.7."}], "source": {"advisory": "GHSA-hhxq-3wg7-4rj8", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-05-13T17:24:41.066396Z", "id": "CVE-2026-42556", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-05-13T17:46:47.709Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-42556", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-05-13T17:24:41.066396Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-05-13T17:46:41.543Z"}}], "cna": {"title": "Postiz stored XSS in public preview page", "source": {"advisory": "GHSA-hhxq-3wg7-4rj8", "discovery": "UNKNOWN"}, "metrics": [{"cvssV3_1": {"scope": "CHANGED", "version": "3.1", "baseScore": 8.9, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:L", "integrityImpact": "HIGH", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "LOW", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}}], "affected": [{"vendor": "gitroomhq", "product": "postiz-app", "versions": [{"status": "affected", "version": ">= 2.21.6, < 2.21.7"}]}], "references": [{"url": "https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-hhxq-3wg7-4rj8", "name": "https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-hhxq-3wg7-4rj8", "tags": ["x_refsource_CONFIRM"]}, {"url": "https://github.com/gitroomhq/postiz-app/releases/tag/v2.21.7", "name": "https://github.com/gitroomhq/postiz-app/releases/tag/v2.21.7", "tags": ["x_refsource_MISC"]}], "descriptions": [{"lang": "en", "value": "Postiz is an AI social media scheduling tool. From version 2.21.6 to before version 2.21.7, any authenticated user who can create a post can store arbitrary HTML in post content by tampering their own save request and send the public preview link /p/<postId>?share=true to another user. The preview page renders that stored HTML with dangerouslySetInnerHTML on the main application origin. This issue has been patched in version 2.21.7."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-79", "description": "CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-05-08T22:28:33.086Z"}}}, "cveMetadata": {"cveId": "CVE-2026-42556", "state": "PUBLISHED", "dateUpdated": "2026-05-13T17:46:47.709Z", "dateReserved": "2026-04-28T16:56:50.192Z", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "datePublished": "2026-05-08T22:28:33.086Z", "assignerShortName": "GitHub_M"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"product": "postiz-app", "vendor": "gitroomhq", "versions": [{"status": "affected", "version": ">= 2.21.6, < 2.21.7"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:gitroom:postiz:2.21.6:*:*:*:*:*:*:*", "matchCriteriaId": "65A2787F-5E06-4B4B-A20F-32F4EB215016", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Postiz is an AI social media scheduling tool. From version 2.21.6 to before version 2.21.7, any authenticated user who can create a post can store arbitrary HTML in post content by tampering their own save request and send the public preview link /p/<postId>?share=true to another user. The preview page renders that stored HTML with dangerouslySetInnerHTML on the main application origin. This issue has been patched in version 2.21.7."}, {"lang": "es", "value": "Postiz es una herramienta de programaci\u00f3n de redes sociales con IA. Desde la versi\u00f3n 2.21.6 hasta antes de la versi\u00f3n 2.21.7, cualquier usuario autenticado que puede crear una publicaci\u00f3n puede almacenar HTML arbitrario en el contenido de la publicaci\u00f3n manipulando su propia solicitud de guardado y enviar el enlace de vista previa p\u00fablica /p/<postId>?share=true a otro usuario. La p\u00e1gina de vista previa renderiza ese HTML almacenado con dangerouslySetInnerHTML en el origen principal de la aplicaci\u00f3n. Este problema ha sido parcheado en la versi\u00f3n 2.21.7."}], "id": "CVE-2026-42556", "lastModified": "2026-07-24T21:10:00.143", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 8.9, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:L", "version": "3.1"}, "exploitabilityScore": 2.3, "impactScore": 6.0, "source": "security-advisories@github.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.0, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.3, "impactScore": 6.0, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-42556", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-05-13T17:24:41.066396Z", "version": "2.0.3"}}]}, "published": "2026-05-08T23:16:39.373", "references": [{"source": "security-advisories@github.com", "tags": ["Product", "Release Notes"], "url": "https://github.com/gitroomhq/postiz-app/releases/tag/v2.21.7"}, {"source": "security-advisories@github.com", "tags": ["Vendor Advisory"], "url": "https://github.com/gitroomhq/postiz-app/security/advisories/GHSA-hhxq-3wg7-4rj8"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-79"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[2.21.6,2.21.7)"}}], "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": "2026-05-08T23:30:15.078456+00:00", "updated": "2026-05-08T23:30:15.343340+00:00", "vendors": ["gitroomhq", "gitroomhq$PRODUCT$postiz-app"]}