CVE-2023-51652

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Prior to version 1.2.0, there is a potential for a mutation cross-site scripting (mXSS) vulnerability in AntiSamy caused by flawed parsing of the HTML being sanitized. To be subject to this vulnerability the `preserveComments` directive must be enabled in your policy file and also allow for certain tags at the same time. As a result, certain crafty inputs can result in elements in comment tags being interpreted as executable when using AntiSamy's sanitized output. This is patched in OWASP AntiSamy .NET 1.2.0 and later. See important remediation details in the reference given below. As a workaround, manually edit the AntiSamy policy file (e.g., antisamy.xml) by deleting the `preserveComments` directive or setting its value to `false`, if present. Also it would be useful to make AntiSamy remove the `noscript` tag by adding a line described in the GitHub Security Advisory to the tag definitions under the `<tagrules>` node, or deleting it entirely if present. As the previously mentioned policy settings are preconditions for the mXSS attack to work, changing them as recommended should be sufficient to protect you against this vulnerability when using a vulnerable version of this library. However, the existing bug would still be present in AntiSamy or its parser dependency (HtmlAgilityPack). The safety of this workaround relies on configurations that may change in the future and don't address the root cause of the vulnerability. 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As the previously mentioned policy settings are preconditions for the mXSS attack to work, changing them as recommended should be sufficient to protect you against this vulnerability when using a vulnerable version of this library. However, the existing bug would still be present in AntiSamy or its parser dependency (HtmlAgilityPack). The safety of this workaround relies on configurations that may change in the future and don't address the root cause of the vulnerability. As such, it is strongly recommended to upgrade to a fixed version of AntiSamy."}], "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": "2024-01-02T20:06:41.333Z"}}}, "cveMetadata": {"cveId": "CVE-2023-51652", "state": "PUBLISHED", "dateUpdated": "2025-04-17T18:37:43.880Z", "dateReserved": "2023-12-20T22:12:04.737Z", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "datePublished": "2024-01-02T20:06:41.333Z", "assignerShortName": "GitHub_M"}, "dataVersion": "5.1"}

{"affected": [{"affectedData": [{"product": "antisamy-dotnet", "vendor": "spassarop", "versions": [{"status": "affected", "version": "< 1.2.0"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:spassarop:owasp_antisamy_.net:*:*:*:*:*:*:*:*", "matchCriteriaId": "13BDB025-E8FE-41BA-8BEC-53FC1A8994D3", "versionEndExcluding": "1.2.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "OWASP AntiSamy .NET is a library for performing cleansing of HTML coming from untrusted sources. Prior to version 1.2.0, there is a potential for a mutation cross-site scripting (mXSS) vulnerability in AntiSamy caused by flawed parsing of the HTML being sanitized. To be subject to this vulnerability the `preserveComments` directive must be enabled in your policy file and also allow for certain tags at the same time. As a result, certain crafty inputs can result in elements in comment tags being interpreted as executable when using AntiSamy's sanitized output. This is patched in OWASP AntiSamy .NET 1.2.0 and later. See important remediation details in the reference given below. As a workaround, manually edit the AntiSamy policy file (e.g., antisamy.xml) by deleting the `preserveComments` directive or setting its value to `false`, if present. Also it would be useful to make AntiSamy remove the `noscript` tag by adding a line described in the GitHub Security Advisory to the tag definitions under the `<tagrules>` node, or deleting it entirely if present. As the previously mentioned policy settings are preconditions for the mXSS attack to work, changing them as recommended should be sufficient to protect you against this vulnerability when using a vulnerable version of this library. However, the existing bug would still be present in AntiSamy or its parser dependency (HtmlAgilityPack). The safety of this workaround relies on configurations that may change in the future and don't address the root cause of the vulnerability. As such, it is strongly recommended to upgrade to a fixed version of AntiSamy."}, {"lang": "es", "value": "OWASP AntiSamy .NET es una librer\u00eda para realizar la limpieza de HTML proveniente de fuentes no confiables. Antes de la versi\u00f3n 1.2.0, exist\u00eda la posibilidad de que se produjera una vulnerabilidad de mutaci\u00f3n de cross site scripting (mXSS) en AntiSamy causada por un an\u00e1lisis defectuoso del HTML que se estaba sanitizando. Para estar sujeto a esta vulnerabilidad, la directiva `preserveComments` debe estar habilitada en su archivo de pol\u00edtica y tambi\u00e9n permitir ciertas etiquetas al mismo tiempo. Como resultado, ciertas entradas astutas pueden dar lugar a que los elementos de las etiquetas de comentarios se interpreten como ejecutables cuando se utiliza la salida sanitizada de AntiSamy. Esto est\u00e1 parcheado en OWASP AntiSamy .NET 1.2.0 y posteriores. Consulte detalles importantes de remediaci\u00f3n en la referencia que se proporciona a continuaci\u00f3n. Como workaround, edite manualmente el archivo de pol\u00edtica AntiSamy (por ejemplo, antisamy.xml) eliminando la directiva `preserveComments` o estableciendo su valor en `false`, si est\u00e1 presente. Tambi\u00e9n ser\u00eda \u00fatil hacer que AntiSamy elimine la etiqueta `noscript` agregando una l\u00ednea descrita en GitHub Security Advisory a las definiciones de etiquetas en el nodo ``, o elimin\u00e1ndola por completo si est\u00e1 presente. Como las configuraciones de pol\u00edticas mencionadas anteriormente son condiciones previas para que funcione el ataque mXSS, cambiarlas seg\u00fan lo recomendado deber\u00eda ser suficiente para protegerlo contra esta vulnerabilidad cuando utilice una versi\u00f3n vulnerable de esta librer\u00eda. Sin embargo, el error existente a\u00fan estar\u00eda presente en AntiSamy o su dependencia del analizador (HtmlAgilityPack). La seguridad de esta soluci\u00f3n depende de configuraciones que pueden cambiar en el futuro y no abordan la causa ra\u00edz de la vulnerabilidad. Como tal, se recomienda encarecidamente actualizar a una versi\u00f3n fija de AntiSamy."}], "id": "CVE-2023-51652", "lastModified": "2026-06-17T06:41:24.377", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.1, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 2.7, "source": "security-advisories@github.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.1, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 2.7, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2023-51652", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-01-08T16:41:55.112798Z", "version": "2.0.3"}}]}, "published": "2024-01-02T20:15:10.453", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/spassarop/antisamy-dotnet/commit/7e500daef6ad9c10e97c68feab78f4cb6e3083c6"}, {"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/spassarop/antisamy-dotnet/commit/8117911933e75a25cd0054ef017577486338444a"}, {"source": "security-advisories@github.com", "tags": ["Vendor Advisory"], "url": "https://github.com/spassarop/antisamy-dotnet/security/advisories/GHSA-8x6f-956f-q43w"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://github.com/spassarop/antisamy-dotnet/commit/7e500daef6ad9c10e97c68feab78f4cb6e3083c6"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://github.com/spassarop/antisamy-dotnet/commit/8117911933e75a25cd0054ef017577486338444a"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Vendor Advisory"], "url": "https://github.com/spassarop/antisamy-dotnet/security/advisories/GHSA-8x6f-956f-q43w"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-79"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

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