{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-54570", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-06-15T19:15:27.343Z", "datePublished": "2026-08-18T17:39:51.827Z", "dateUpdated": "2026-08-18T19:27:44.943Z"}, "containers": {"cna": {"title": "AngleSharp: HTML5 Spec Compliance: mXSS via annotation-xml HTML Integration Point Bypass", "problemTypes": [{"descriptions": [{"cweId": "CWE-80", "lang": "en", "description": "CWE-80: Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:H/A:N", "version": "3.1"}}], "references": [{"name": "https://github.com/AngleSharp/AngleSharp/security/advisories/GHSA-pgww-w46g-26qg", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/AngleSharp/AngleSharp/security/advisories/GHSA-pgww-w46g-26qg"}, {"name": "https://github.com/AngleSharp/AngleSharp/commit/8033a5c690af9c2c443f58e34875343fa4cc1d07", "tags": ["x_refsource_MISC"], "url": "https://github.com/AngleSharp/AngleSharp/commit/8033a5c690af9c2c443f58e34875343fa4cc1d07"}, {"name": "https://github.com/AngleSharp/AngleSharp/releases/tag/1.5.0", "tags": ["x_refsource_MISC"], "url": "https://github.com/AngleSharp/AngleSharp/releases/tag/1.5.0"}], "affected": [{"vendor": "AngleSharp", "product": "AngleSharp", "versions": [{"version": "< 1.5.0", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-08-18T17:39:51.827Z"}, "descriptions": [{"lang": "en", "value": "AngleSharp is a .NET library for parsing angle bracket based hyper-texts. Prior to 1.5.0, MathAnnotationXmlElement in AngleSharp/Mathml/Dom/Internal/MathAnnotationXmlElement.cs is not treated as an HTML integration point when its encoding attribute is text/html or application/xhtml+xml, causing Consume in AngleSharp/Html/Parser/HtmlDomBuilder.cs to route tokens through foreign-content parsing instead of HTML parsing. A sanitizer can therefore observe a different DOM from the browser that reparses the serialized output. An attacker can combine this namespace differential with markup-breaking characters in an attribute value so that an element hidden from the sanitizer becomes active script-capable HTML after browser reparse, resulting in mutation cross-site scripting. This issue is fixed in version 1.5.0."}], "source": {"advisory": "GHSA-pgww-w46g-26qg", "discovery": "UNKNOWN"}}, "adp": [{"references": [{"url": "https://github.com/AngleSharp/AngleSharp/security/advisories/GHSA-pgww-w46g-26qg", "tags": ["exploit"]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-08-18T19:27:27.410295Z", "id": "CVE-2026-54570", "options": [{"Exploitation": "poc"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-08-18T19:27:44.943Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-54570", "role": "CISA Coordinator", "options": [{"Exploitation": "poc"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-08-18T19:27:27.410295Z"}}}], "references": [{"url": "https://github.com/AngleSharp/AngleSharp/security/advisories/GHSA-pgww-w46g-26qg", "tags": ["exploit"]}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-08-18T19:27:40.871Z"}}], "cna": {"title": "AngleSharp: HTML5 Spec Compliance: mXSS via annotation-xml HTML Integration Point Bypass", "source": {"advisory": "GHSA-pgww-w46g-26qg", "discovery": "UNKNOWN"}, "metrics": [{"cvssV3_1": {"scope": "CHANGED", "version": "3.1", "baseScore": 6.9, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "REQUIRED", "attackComplexity": "HIGH", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}}], "affected": [{"vendor": "AngleSharp", "product": "AngleSharp", "versions": [{"status": "affected", "version": "< 1.5.0"}]}], "references": [{"url": "https://github.com/AngleSharp/AngleSharp/security/advisories/GHSA-pgww-w46g-26qg", "name": "https://github.com/AngleSharp/AngleSharp/security/advisories/GHSA-pgww-w46g-26qg", "tags": ["x_refsource_CONFIRM"]}, {"url": "https://github.com/AngleSharp/AngleSharp/commit/8033a5c690af9c2c443f58e34875343fa4cc1d07", "name": "https://github.com/AngleSharp/AngleSharp/commit/8033a5c690af9c2c443f58e34875343fa4cc1d07", "tags": ["x_refsource_MISC"]}, {"url": "https://github.com/AngleSharp/AngleSharp/releases/tag/1.5.0", "name": "https://github.com/AngleSharp/AngleSharp/releases/tag/1.5.0", "tags": ["x_refsource_MISC"]}], "descriptions": [{"lang": "en", "value": "AngleSharp is a .NET library for parsing angle bracket based hyper-texts. Prior to 1.5.0, MathAnnotationXmlElement in AngleSharp/Mathml/Dom/Internal/MathAnnotationXmlElement.cs is not treated as an HTML integration point when its encoding attribute is text/html or application/xhtml+xml, causing Consume in AngleSharp/Html/Parser/HtmlDomBuilder.cs to route tokens through foreign-content parsing instead of HTML parsing. A sanitizer can therefore observe a different DOM from the browser that reparses the serialized output. An attacker can combine this namespace differential with markup-breaking characters in an attribute value so that an element hidden from the sanitizer becomes active script-capable HTML after browser reparse, resulting in mutation cross-site scripting. This issue is fixed in version 1.5.0."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-80", "description": "CWE-80: Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-08-18T17:39:51.827Z"}}}, "cveMetadata": {"cveId": "CVE-2026-54570", "state": "PUBLISHED", "dateUpdated": "2026-08-18T19:27:44.943Z", "dateReserved": "2026-06-15T19:15:27.343Z", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "datePublished": "2026-08-18T17:39:51.827Z", "assignerShortName": "GitHub_M"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"product": "AngleSharp", "vendor": "AngleSharp", "versions": [{"status": "affected", "version": "< 1.5.0"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "AngleSharp is a .NET library for parsing angle bracket based hyper-texts. Prior to 1.5.0, MathAnnotationXmlElement in AngleSharp/Mathml/Dom/Internal/MathAnnotationXmlElement.cs is not treated as an HTML integration point when its encoding attribute is text/html or application/xhtml+xml, causing Consume in AngleSharp/Html/Parser/HtmlDomBuilder.cs to route tokens through foreign-content parsing instead of HTML parsing. A sanitizer can therefore observe a different DOM from the browser that reparses the serialized output. An attacker can combine this namespace differential with markup-breaking characters in an attribute value so that an element hidden from the sanitizer becomes active script-capable HTML after browser reparse, resulting in mutation cross-site scripting. This issue is fixed in version 1.5.0."}], "id": "CVE-2026-54570", "lastModified": "2026-08-18T20:17:18.530", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 1.6, "impactScore": 4.7, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-54570", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-08-18T19:27:27.410295Z", "version": "2.0.3"}}]}, "published": "2026-08-18T18:18:23.310", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/AngleSharp/AngleSharp/commit/8033a5c690af9c2c443f58e34875343fa4cc1d07"}, {"source": "security-advisories@github.com", "url": "https://github.com/AngleSharp/AngleSharp/releases/tag/1.5.0"}, {"source": "security-advisories@github.com", "url": "https://github.com/AngleSharp/AngleSharp/security/advisories/GHSA-pgww-w46g-26qg"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/AngleSharp/AngleSharp/security/advisories/GHSA-pgww-w46g-26qg"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-80"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"created": "2026-08-18T20:00:04.736503+00:00", "updated": "2026-08-18T20:00:04.736508+00:00", "vendors": []}