{"id":"CVE-2026-50556","aliases":["GHSA-gxx4-3xcv-f8qx"],"url":"https://o3.security/vulnerability/CVE-2026-50556","summary":"Angular: Missing `<noscript>` Raw-Text Serialization Escaping leads to Cross-Site Scripting (XSS) in Angular SSR","details":"Angular is a development platform for building mobile and desktop web applications using TypeScript/JavaScript and other languages. Prior to 22.0.0-rc.2, 21.2.16, 20.3.24, and 19.2.25, a Cross-Site Scripting (XSS) vulnerability exists in @angular/platform-server's DOM emulation dependency (domino) when serializing the content of <noscript> elements. When rendering dynamic text content inside a <noscript> element via template bindings (such as {{ value }} or [textContent]), the template engine expects the browser to render the content safely. Under Server-Side Rendering (SSR), domino is configured with scripting enabled, meaning <noscript> is treated as a raw-text element. However, domino's serializer completely omitted <noscript> from the list of raw-text elements requiring closing-tag escaping during DOM serialization. As a result, any occurrence of </noscript> in the bound dynamic text was never escaped under any circumstances. The unescaped closing tag was serialized directly into the output HTML (e.g. <noscript></noscript><script>alert(1)</script></noscript>). When parsed by a browser, it closes the <noscript> block early, allowing the injected <script> block to execute in the user's browser context, causing same-origin Cross-Site Scripting (XSS). This vulnerability is fixed in 22.0.0-rc.2, 21.2.16, 20.3.24, and 19.2.25.","published":"2026-06-22T15:38:28.166Z","modified":"2026-07-16T03:31:02.874506709Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"@angular/platform-server","fixedVersion":"22.0.0-rc.2"},{"ecosystem":"npm","name":"@angular/platform-server","fixedVersion":"21.2.16"},{"ecosystem":"npm","name":"@angular/platform-server","fixedVersion":"20.3.24"},{"ecosystem":"npm","name":"@angular/platform-server","fixedVersion":"19.2.25"},{"ecosystem":"npm","name":"@angular/platform-server","fixedVersion":null}],"fix":{"url":"https://github.com/angular/domino/pull/29","label":"angular/domino#29"},"references":[{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-50556.json"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2026-50556"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/50xxx/CVE-2026-50556.json"},{"type":"ADVISORY","url":"https://github.com/angular/angular/security/advisories/GHSA-gxx4-3xcv-f8qx"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-50556"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2491459"},{"type":"REPORT","url":"https://github.com/angular/angular/issues/68903"},{"type":"FIX","url":"https://github.com/angular/domino/pull/29"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-16T03:31:02.874506709Z"}}