{"items":[{"id":"NVI-00016189","kind":"vulnerability","title":"AngleSharp HTML5 Spec Compliance: mXSS via annotation-xml HTML Integration Point Bypass","revision":2,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected.","NVD lastModified does not establish freshness of every associated CPE record."],"lifecycle":"active","identifiers":["GHSA-pgww-w46g-26qg","CVE-2026-54570"],"plain_summary":"GitHub lists this reviewed advisory for AngleSharp. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-4c7a0f8c8ec647b6be4d238667597f9f"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-07-17T21:17:11.000Z","value":"6.9 medium","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-420b4f93e1bca7acdf163669b6d2d27e"},{"kind":"CVSS","as_of":"2026-09-18T20:09:01.757Z","value":"6.9 MEDIUM (3.1)","meaning":"security-advisories@github.com severity; no combined Null risk score.","source_id":"sr-4c7a0f8c8ec647b6be4d238667597f9f"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-420b4f93e1bca7acdf163669b6d2d27e","url":"https://github.com/advisories/GHSA-pgww-w46g-26qg","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-pgww-w46g-26qg","publisher":"GitHub Advisory Database","observed_at":"2026-11-04T02:49:06.528Z"},{"id":"sr-4c7a0f8c8ec647b6be4d238667597f9f","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-54570","basis":"official_catalog","notes":"This product uses data from the NVD API but is not endorsed or certified by the NVD.","title":"CVE-2026-54570","publisher":"NIST National Vulnerability Database","observed_at":"2026-11-08T01:48:19.229Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-420b4f93e1bca7acdf163669b6d2d27e"],"technology":"AngleSharp","known_exclusions":[],"conditions_summary":"### Summary\nThe HTML specification requires that a MathML `` element with `encoding=\"text/html\"` or `encoding=\"application/xhtml+xml\"` is treated as an HTML integration point. Content inside it must be parsed as HTML, not MathML.\n\nAngleSharp does not implement this correctly. As a result, the parser produces a DOM tree that differs from what a browser will build (different namespaces if `encoding=\"text/html\"` is not treated) when given the same serialized output. Two bugs combine to make this exploitable:\n\n- Missing HtmlTip flag: MathAnnotationXmlElement is never assigned NodeFlags.HtmlTip based on its encoding attribute, so the Consume() dispatch always routes tokens to Foreign() instead of Home() (HTML mode).\n- Unescaped  in attribute values: HtmlMarkupFormatter.WriteAttributeValue() does not escape  characters, only & and \". This allows injected markup to break out of attribute values on re-parse. _See Escape \"\" in attributes when serializing HTML #6235\n_\n\n\n### Details\nIn `MathAnnotationXmlElement` (`AngleSharp/Mathml/Dom/Internal/MathAnnotationXmlElement.cs`):\n```cs\n// Current — HtmlTip is never set","public_affected_ranges":["< 1.5.0"]}],"null_published_at":"2026-11-08T19:53:44.056Z","source_updated_at":"2026-07-17T21:17:11.000Z","source_disclosed_at":"2026-07-17T21:17:10.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Source facts changed; compare the preserved prior revision.","null_first_observed_at":"2026-11-04T02:49:06.528Z"},{"id":"NVI-00016189","kind":"vulnerability","title":"AngleSharp HTML5 Spec Compliance: mXSS via annotation-xml HTML Integration Point Bypass","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-pgww-w46g-26qg","CVE-2026-54570"],"plain_summary":"GitHub lists this reviewed advisory for AngleSharp. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-420b4f93e1bca7acdf163669b6d2d27e"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-07-17T21:17:11.000Z","value":"6.9 medium","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-420b4f93e1bca7acdf163669b6d2d27e"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-420b4f93e1bca7acdf163669b6d2d27e","url":"https://github.com/advisories/GHSA-pgww-w46g-26qg","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-pgww-w46g-26qg","publisher":"GitHub Advisory Database","observed_at":"2026-11-04T02:49:06.528Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-420b4f93e1bca7acdf163669b6d2d27e"],"technology":"AngleSharp","known_exclusions":[],"conditions_summary":"### Summary\nThe HTML specification requires that a MathML `` element with `encoding=\"text/html\"` or `encoding=\"application/xhtml+xml\"` is treated as an HTML integration point. Content inside it must be parsed as HTML, not MathML.\n\nAngleSharp does not implement this correctly. As a result, the parser produces a DOM tree that differs from what a browser will build (different namespaces if `encoding=\"text/html\"` is not treated) when given the same serialized output. Two bugs combine to make this exploitable:\n\n- Missing HtmlTip flag: MathAnnotationXmlElement is never assigned NodeFlags.HtmlTip based on its encoding attribute, so the Consume() dispatch always routes tokens to Foreign() instead of Home() (HTML mode).\n- Unescaped  in attribute values: HtmlMarkupFormatter.WriteAttributeValue() does not escape  characters, only & and \". This allows injected markup to break out of attribute values on re-parse. _See Escape \"\" in attributes when serializing HTML #6235\n_\n\n\n### Details\nIn `MathAnnotationXmlElement` (`AngleSharp/Mathml/Dom/Internal/MathAnnotationXmlElement.cs`):\n```cs\n// Current — HtmlTip is never set","public_affected_ranges":["< 1.5.0"]}],"null_published_at":"2026-11-04T10:04:27.903Z","source_updated_at":"2026-07-17T21:17:11.000Z","source_disclosed_at":"2026-07-17T21:17:10.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"First indexed by Null; source disclosure date is shown separately.","null_first_observed_at":"2026-11-04T02:49:06.528Z"}],"next_cursor":null,"snapshot_revision":"42594"}