Angular is a development platform for building mobile and desktop web applications using TypeScript/JavaScript and other languages. Prior to 20.3.30, 21.2.22, and 22.1.4, Angular server-side rendering (SSR) in @angular/platform-server serializes ProcessingInstruction DOM nodes inside fallback raw-content elements without escaping matching ancestor closing tags. ProcessingInstruction data escaped greater-than characters but left less-than characters untouched and did not inspect fallback ancestors, so data such as a matching closing tag prematurely terminates noscript, iframe, noembed, or noframes containers. The vulnerable nodes cannot be authored through standard Angular templates; reachability requires application or library code using inject(DOCUMENT).createProcessingInstruction with attacker-controlled data or Renderer2 DOM insertion inside a fallback container. In HTML5 RAWTEXT parsing, the premature close causes subsequent sibling elements to be interpreted as live HTML and enables arbitrary JavaScript execution in a victim's browser. This issue is fixed in versions 20.3.30, 21.2.22, and 22.1.4.

• https://github.com/angular/angular/commit/73d8bbd27cb46495426d4132975a1355b47ad915
• https://github.com/angular/angular/commit/89b20568dfaee1ec8e0b3bcf1872acdddd2f4fef
• https://github.com/angular/angular/commit/ba3bc47b20b3d12f5eb141ec9c651373ae4d15e8
• https://github.com/angular/angular/issues/70146
• https://github.com/angular/angular/releases/tag/v20.3.30
• https://github.com/angular/angular/releases/tag/v21.2.22
• https://github.com/angular/angular/releases/tag/v22.1.4
• https://github.com/angular/angular/security/advisories/GHSA-j3r3-mxqp-r2p4
• https://github.com/angular/domino/commit/04f987dc08ff3736b427f50941adf1722458528f
• https://github.com/angular/angular/issues/70146
• https://github.com/angular/angular/security/advisories/GHSA-j3r3-mxqp-r2p4

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