SSRF in Angular
CVE-2026-88056
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.
Vulnerability class: SSRF (Server-Side Request Forgery)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.005 (45.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 45.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.005 · change: -0.001
Affected products
- Angular — versions <= 19.2.25, >= 20.0.0, < 20.3.30, >= 21.0.0, < 21.2.22
Weakness classification (CWE)
References
- github.com/angular/angular/security/advisories/GHSA-f6mr-pjwc-34m4 (Exploit, Mitigation, Vendor Advisory)
- github.com/angular/angular/commit/3e924cc8dbbb57f23b262cb8f0d7e2bd0673034c (Patch)
- github.com/angular/angular/commit/5aa6d97deb9ef1de14e23748b7fa74f97d183132 (Patch)
- github.com/angular/angular/commit/71e52d1396b9cef98652929b73e08c4cde645970 (Patch)
- github.com/angular/angular/releases/tag/v20.3.30 (Release Notes)
- github.com/angular/angular/releases/tag/v21.2.22 (Release Notes)
- github.com/angular/angular/releases/tag/v22.1.4 (Release Notes)
Frequently asked questions
- What is CVE-2026-88056?
- CVE-2026-88056 is a critical-severity vulnerability in Angular, classified under Server-Side Request Forgery (SSRF). CVSS score: 9.1/10. Published 2026-09-10.
- How severe is CVE-2026-88056?
- Critical severity. CVSS v3 base score is 9.1 out of 10.