CVE-2026-88056: Angular

Critical severity, CVSS 9.1. EPSS: 0.5% chance of exploitation in the next 30 days.

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 in @angular/platform-server processes user-controlled resource or request URLs through HttpClient after application code validates them with WHATWG URL parsing. The resolveUrl and parseUrl utilities called String.prototype.trim(), which removed leading Unicode whitespace such as U+00A0 or U+FEFF after the input passed a same-origin check, converting a relative path into a protocol-relative attacker-controlled URL. In affected applications that attach sensitive server-side credentials such as Authorization headers to approved requests, relativeUrlsTransformerInterceptorFn then dispatched the request to the attacker-controlled origin, causing SSRF and credential disclosure. This issue is fixed in versions 20.3.30, 21.2.22, and 22.1.4.

Affected products

• Angular Angular: from 19.0.0, up to and including 19.2.25; from 20.0.0, before 20.3.30 (fixed in 20.3.30); from 21.0.0, before 21.2.22 (fixed in 21.2.22); from 22.0.0, before 22.1.4 (fixed in 22.1.4)

Published 2026-09-10. Last modified 2026-09-29.