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Vulnerability record · CVE-2026-88056 · published 10 September 2026

CVE-2026-88056: Server-side request forgery (SSRF) vulnerability

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.

8.6 CVSS 4.0 High EPSS 0.61% · top 52.8% CWE-918 · Server-side request forgery (SSRF) Undergoing Analysis
8.6CVSS 4.0 base score
0.61%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
8References
15 Sep 2026Last modified by NVD

Description

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.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://github.com/angular/angular/commit/3e924cc8dbbb57f23b262cb8f0d7e2bd0673034c
https://github.com/angular/angular/commit/5aa6d97deb9ef1de14e23748b7fa74f97d183132
https://github.com/angular/angular/commit/71e52d1396b9cef98652929b73e08c4cde645970
https://github.com/angular/angular/releases/tag/v20.3.30
https://github.com/angular/angular/releases/tag/v21.2.22
https://github.com/angular/angular/releases/tag/v22.1.4
https://github.com/angular/angular/security/advisories/GHSA-f6mr-pjwc-34m4
https://github.com/angular/angular/security/advisories/GHSA-f6mr-pjwc-34m4

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Source: NIST National Vulnerability Database (record CVE-2026-88056), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.