FKIE_CVE-2026-50556

Vulnerability from fkie_nvd - Published: 2026-06-22 18:16 - Updated: 2026-07-09 15:38
Severity
6.1 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
8.1 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Summary
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.
References
security-advisories@github.comhttps://github.com/angular/angular/issues/68903Issue Tracking
security-advisories@github.comhttps://github.com/angular/angular/security/advisories/GHSA-gxx4-3xcv-f8qxThird Party Advisory
security-advisories@github.comhttps://github.com/angular/domino/pull/29Issue Tracking, Patch
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/security/cve/CVE-2026-50556Third Party Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://bugzilla.redhat.com/show_bug.cgi?id=2491459Third Party Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-50556.jsonThird Party Advisory
Impacted products
Vendor Product Version
angular angular *
angular angular *
angular angular *
angular angular *
angular angular 22.0.0
angular angular 22.0.0
angular angular 22.0.0
angular angular 22.0.0
angular angular 22.0.0
angular angular 22.0.0
angular angular 22.0.0
angular angular 22.0.0
angular angular 22.0.0
angular angular 22.0.0
angular angular 22.0.0
angular angular 22.0.0
angular angular 22.0.0
angular angular 22.0.0
angular angular 22.0.0
To clipboard 

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      "value": "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\u0027s DOM emulation dependency (domino) when serializing the content of \u003cnoscript\u003e elements. When rendering dynamic text content inside a \u003cnoscript\u003e 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 \u003cnoscript\u003e is treated as a raw-text element. However, domino\u0027s serializer completely omitted \u003cnoscript\u003e from the list of raw-text elements requiring closing-tag escaping during DOM serialization. As a result, any occurrence of \u003c/noscript\u003e in the bound dynamic text was never escaped under any circumstances. The unescaped closing tag was serialized directly into the output HTML (e.g. \u003cnoscript\u003e\u003c/noscript\u003e\u003cscript\u003ealert(1)\u003c/script\u003e\u003c/noscript\u003e). When parsed by a browser, it closes the \u003cnoscript\u003e block early, allowing the injected \u003cscript\u003e block to execute in the user\u0027s 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."
    }
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  "id": "CVE-2026-50556",
  "lastModified": "2026-07-09T15:38:13.800",
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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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