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How CVE-2026-69149 Works
Angular’s Server-Side Rendering (SSR) relies on @angular/platform-server, which uses the `domino` library to emulate a DOM on the Node.js server. During SSR, `domino` is configured with scripting enabled, causing it to treat elements like <iframe>, <noembed>, <noframes>, and `` tag, resulting in the following HTML being sent to the browser:
<noscript>...</noscript><script>/ malicious code /</script><noscript>...</noscript>
Protection:
The primary protection is to update to a patched version of Angular:
- 22.0.7
- 21.2.19
- 20.3.27
If an immediate update is not possible, implement these workarounds:
1. Disable Critical CSS Inlining: This prevents `domino` from re-parsing and re-serializing the HTML during SSR post-processing.
- In angular.json, set `inlineCritical` to false:
{
"projects": {
"my-app": {
"architect": {
"build": {
"builder": "@angular/build:application",
"options": {
"optimization": {
"styles": {
"inlineCritical": false
}
}
}
}
}
}
}
}
- When using `CommonEngine` programmatically, set `inlineCriticalCss: false` in your render options.
2. Avoid Binding User-Controlled Values: Do not place user-controlled data inside <iframe>, <noembed>, <noframes>, or `
Impact:
Successful exploitation allows an attacker to perform same-origin Cross-Site Scripting (XSS) attacks. This can lead to:
- Session Hijacking: Stealing user session cookies to impersonate them.
- Credential Theft: Phishing for user credentials or capturing them via keylogging.
- Unauthorized Actions: Performing actions on behalf of the user, such as making purchases or changing account details.
- Defacement: Altering the visual appearance of the website.
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Sources:
Reported By: github.com
Extra Source Hub:
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