CVE-2020-26287

{"containers": {"cna": {"affected": [{"product": "hedgedoc", "vendor": "hedgedoc", "versions": [{"status": "affected", "version": "< 1.7.1"}]}], "descriptions": [{"lang": "en", "value": "HedgeDoc is a collaborative platform for writing and sharing markdown. In HedgeDoc before version 1.7.1 an attacker can inject arbitrary `script` tags in HedgeDoc notes using mermaid diagrams. Our content security policy prevents loading scripts from most locations, but `www.google-analytics.com` is allowed. Using Google Tag Manger it is possible to inject arbitrary JavaScript and execute it on page load. Depending on the configuration of the instance, the attacker may not need authentication to create or edit notes. The problem is patched in HedgeDoc 1.7.1. As a workaround one can disallow `www.google-analytics.com` in the `Content-Security-Policy` header. Note that other ways to leverage the `script` tag injection might exist."}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 8.7, "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:N", "version": "3.1"}}], "problemTypes": [{"descriptions": [{"cweId": "CWE-79", "description": "CWE-79 Cross-site Scripting (XSS)", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"dateUpdated": "2020-12-28T23:30:17.000Z", "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M"}, "references": [{"tags": ["x_refsource_MISC"], "url": "https://github.com/hedgedoc/hedgedoc/releases/tag/1.7.1"}, {"tags": ["x_refsource_CONFIRM"], "url": "https://github.com/hedgedoc/hedgedoc/security/advisories/GHSA-g6w6-7xf9-m95p"}, {"tags": ["x_refsource_MISC"], "url": "https://github.com/hackmdio/codimd/issues/1630"}, {"tags": ["x_refsource_MISC"], "url": "https://github.com/Alemmi/ctf-writeups/blob/main/hxpctf-2020/hackme/solution.md"}, {"tags": ["x_refsource_MISC"], "url": "https://github.com/hedgedoc/hedgedoc/commit/58276ebbf4504a682454a3686dcaff88bc1069d4"}], "source": {"advisory": "GHSA-g6w6-7xf9-m95p", "discovery": "UNKNOWN"}, "title": "Stored XSS in mermaid diagrams", "x_legacyV4Record": {"CVE_data_meta": {"ASSIGNER": "security-advisories@github.com", "ID": "CVE-2020-26287", "STATE": "PUBLIC", "TITLE": "Stored XSS in mermaid diagrams"}, "affects": {"vendor": {"vendor_data": [{"product": {"product_data": [{"product_name": "hedgedoc", "version": {"version_data": [{"version_value": "< 1.7.1"}]}}]}, "vendor_name": "hedgedoc"}]}}, "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": {"description_data": [{"lang": "eng", "value": "HedgeDoc is a collaborative platform for writing and sharing markdown. In HedgeDoc before version 1.7.1 an attacker can inject arbitrary `script` tags in HedgeDoc notes using mermaid diagrams. Our content security policy prevents loading scripts from most locations, but `www.google-analytics.com` is allowed. Using Google Tag Manger it is possible to inject arbitrary JavaScript and execute it on page load. Depending on the configuration of the instance, the attacker may not need authentication to create or edit notes. The problem is patched in HedgeDoc 1.7.1. As a workaround one can disallow `www.google-analytics.com` in the `Content-Security-Policy` header. Note that other ways to leverage the `script` tag injection might exist."}]}, "impact": {"cvss": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 8.7, "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:N", "version": "3.1"}}, "problemtype": {"problemtype_data": [{"description": [{"lang": "eng", "value": "CWE-79 Cross-site Scripting (XSS)"}]}]}, "references": {"reference_data": [{"name": "https://github.com/hedgedoc/hedgedoc/releases/tag/1.7.1", "refsource": "MISC", "url": "https://github.com/hedgedoc/hedgedoc/releases/tag/1.7.1"}, {"name": "https://github.com/hedgedoc/hedgedoc/security/advisories/GHSA-g6w6-7xf9-m95p", "refsource": "CONFIRM", "url": "https://github.com/hedgedoc/hedgedoc/security/advisories/GHSA-g6w6-7xf9-m95p"}, {"name": "https://github.com/hackmdio/codimd/issues/1630", "refsource": "MISC", "url": "https://github.com/hackmdio/codimd/issues/1630"}, {"name": "https://github.com/Alemmi/ctf-writeups/blob/main/hxpctf-2020/hackme/solution.md", "refsource": "MISC", "url": "https://github.com/Alemmi/ctf-writeups/blob/main/hxpctf-2020/hackme/solution.md"}, {"name": "https://github.com/hedgedoc/hedgedoc/commit/58276ebbf4504a682454a3686dcaff88bc1069d4", "refsource": "MISC", "url": "https://github.com/hedgedoc/hedgedoc/commit/58276ebbf4504a682454a3686dcaff88bc1069d4"}]}, "source": {"advisory": "GHSA-g6w6-7xf9-m95p", "discovery": "UNKNOWN"}}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T15:56:03.991Z"}, "title": "CVE Program Container", "references": [{"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://github.com/hedgedoc/hedgedoc/releases/tag/1.7.1"}, {"tags": ["x_refsource_CONFIRM", "x_transferred"], "url": "https://github.com/hedgedoc/hedgedoc/security/advisories/GHSA-g6w6-7xf9-m95p"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://github.com/hackmdio/codimd/issues/1630"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://github.com/Alemmi/ctf-writeups/blob/main/hxpctf-2020/hackme/solution.md"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://github.com/hedgedoc/hedgedoc/commit/58276ebbf4504a682454a3686dcaff88bc1069d4"}]}]}, "cveMetadata": {"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "assignerShortName": "GitHub_M", "cveId": "CVE-2020-26287", "datePublished": "2020-12-28T23:30:17.000Z", "dateReserved": "2020-10-01T00:00:00.000Z", "dateUpdated": "2024-08-04T15:56:03.991Z", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.1"}

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{"affected": [{"affectedData": [{"product": "hedgedoc", "vendor": "hedgedoc", "versions": [{"status": "affected", "version": "< 1.7.1"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:hedgedoc:hedgedoc:*:*:*:*:*:*:*:*", "matchCriteriaId": "DB55BE58-3D3F-40C5-89FE-2AACEA56F4E0", "versionEndExcluding": "1.7.1", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "HedgeDoc is a collaborative platform for writing and sharing markdown. In HedgeDoc before version 1.7.1 an attacker can inject arbitrary `script` tags in HedgeDoc notes using mermaid diagrams. Our content security policy prevents loading scripts from most locations, but `www.google-analytics.com` is allowed. Using Google Tag Manger it is possible to inject arbitrary JavaScript and execute it on page load. Depending on the configuration of the instance, the attacker may not need authentication to create or edit notes. The problem is patched in HedgeDoc 1.7.1. As a workaround one can disallow `www.google-analytics.com` in the `Content-Security-Policy` header. Note that other ways to leverage the `script` tag injection might exist."}, {"lang": "es", "value": "HedgeDoc es una plataforma colaborativa para escribir y compartir rebajas.&#xa0;En HedgeDoc versiones anteriores a 1.7.1, un atacante puede inyectar etiquetas \"script\" arbitrarias en las notas de HedgeDoc usando diagramas mermaid.&#xa0;Nuestra pol\u00edtica de seguridad de contenido evita una carga de scripts de la mayor\u00eda de las ubicaciones, pero se permite \"www.google-analytics.com\"&#xa0;Usando Google Tag Manager, es posible inyectar JavaScript arbitrario y ejecutarlo al cargar la p\u00e1gina.&#xa0;Dependiendo de la configuraci\u00f3n de la instancia, es posible que el atacante no necesite autenticaci\u00f3n para crear o editar notas.&#xa0;El problema est\u00e1 parcheado en HedgeDoc versi\u00f3n 1.7.1.&#xa0;Como soluci\u00f3n alternativa, se puede rechazar \"www.google-analytics.com\" en el encabezado \"Content-Security-Policy\".&#xa0;Tome en cuenta que pueden presentar otras formas de aprovechar la inyecci\u00f3n de etiquetas \"script\""}], "id": "CVE-2020-26287", "lastModified": "2026-06-17T03:08:00.227", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "MEDIUM", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "NONE", "baseScore": 4.3, "confidentialityImpact": "NONE", "integrityImpact": "PARTIAL", "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N", "version": "2.0"}, "exploitabilityScore": 8.6, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": true}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 8.7, "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:N", "version": "3.1"}, "exploitabilityScore": 2.3, "impactScore": 5.8, "source": "security-advisories@github.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 8.7, "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:N", "version": "3.1"}, "exploitabilityScore": 2.3, "impactScore": 5.8, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2020-12-29T00:15:12.673", "references": [{"source": "security-advisories@github.com", "tags": ["Exploit", "Third Party Advisory"], "url": "https://github.com/Alemmi/ctf-writeups/blob/main/hxpctf-2020/hackme/solution.md"}, {"source": "security-advisories@github.com", "tags": ["Third Party Advisory"], "url": "https://github.com/hackmdio/codimd/issues/1630"}, {"source": "security-advisories@github.com", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/hedgedoc/hedgedoc/commit/58276ebbf4504a682454a3686dcaff88bc1069d4"}, {"source": "security-advisories@github.com", "tags": ["Third Party Advisory"], "url": "https://github.com/hedgedoc/hedgedoc/releases/tag/1.7.1"}, {"source": "security-advisories@github.com", "tags": ["Third Party Advisory"], "url": "https://github.com/hedgedoc/hedgedoc/security/advisories/GHSA-g6w6-7xf9-m95p"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Exploit", "Third Party Advisory"], "url": "https://github.com/Alemmi/ctf-writeups/blob/main/hxpctf-2020/hackme/solution.md"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://github.com/hackmdio/codimd/issues/1630"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/hedgedoc/hedgedoc/commit/58276ebbf4504a682454a3686dcaff88bc1069d4"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://github.com/hedgedoc/hedgedoc/releases/tag/1.7.1"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://github.com/hedgedoc/hedgedoc/security/advisories/GHSA-g6w6-7xf9-m95p"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-79"}], "source": "security-advisories@github.com", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-79"}], "source": "nvd@nist.gov", "type": "Primary"}]}

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