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Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVE-2026-54267

High
8.6/10

Summary

To optimize client-side bootstrap in Server-Side Rendered (SSR) environments, Angular supports Hydration via `provideClientHydration()`. During SSR, Angular serializes the application's runtime state (such as cached `HttpClient` responses) and outputs it into the HTML stream as a `<script>` tag with a predictable identifier. All versions prior to 20.3.25, 21.0.0-next.0 prior to 21.2.17, and 22.0.0-next.0 prior to 22.0.1 are affected.

  • LOW
  • NETWORK
  • LOW
  • CHANGED
  • REQUIRED
  • NONE
  • LOW
  • NONE

CWE-79 - Cross Site Scripting

Cross-Site Scripting, commonly referred to as XSS, is the most dominant class of vulnerabilities. It allows an attacker to inject malicious code into a pregnable web application and victimize its users. The exploitation of such a weakness can cause severe issues such as account takeover, and sensitive data exfiltration. Because of the prevalence of XSS vulnerabilities and their high rate of exploitation, it has remained in the OWASP top 10 vulnerabilities for years.

References

Advisory Timeline

  • Published