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CVE-2026-88059— Angular: Information Leak via `HttpTransferCache` Bypass When Using `withRequestsMadeViaParent`

Quick assessment

Affected
angular angular
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Angular 是一个用于使用 TypeScript/JavaScript 及其他语言构建移动端和桌面端 Web 应用的开发平台。 在 20.3.28、21.2.20 和 22.1.1 之前，Angular 的 中的 可能在特定条件下缓存经过身份验证的响应。该问题发生在同时启用服务端渲染（SSR）和水合（hydration），且使用通过 配置的分层 时。 具体场景如下： 1. 子级 TransferCache 在委派请求之前，先评估了一个初始的匿名请求。 2. 随后，父级的 拦截器链为请求添加了 Authoriza

CVSS 4.0 · Medium

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 4

VendorProduct Version RangeStatus
angular angular <= 19.2.25 affected
>= 20.0.0, < 20.3.28 affected
>= 21.0.0, < 21.2.20 affected
>= 22.0.0, < 22.1.1 affected
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I. Basic Information for CVE-2026-88059

Vulnerability Information
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Vulnerability Title
Angular: Information Leak via `HttpTransferCache` Bypass When Using `withRequestsMadeViaParent`
Source: CVE Program / CVE List V5
Vulnerability Description
Angular is a development platform for building mobile and desktop web applications using TypeScript/JavaScript and other languages. Prior to 20.3.28, 21.2.20, and 22.1.1, Angular's @angular/common HttpTransferCache can cache an authenticated response when Server-Side Rendering (SSR) and hydration use a hierarchical HttpClient configured with withRequestsMadeViaParent. The child TransferCache evaluates an initially anonymous request before delegation, then a parent withInterceptors chain adds an Authorization header, cookie, or API token; although the parent cache skips the authenticated request, the child still stores the private response in TransferState serialized as JSON in the ng-state script. Exploitation requires provideClientHydration, child provideHttpClient delegation through withRequestsMadeViaParent, parent-level credential injection, and an SSR HTML response shared across users by a CDN, reverse proxy, or application cache. A later unauthenticated or unauthorized visitor can receive the cached HTML containing the earlier authenticated user's sensitive response data. Applications can mitigate by attaching credentials at the child, filtering sensitive endpoints with withHttpTransferCacheOptions, disabling transfer caching for sensitive routes, or marking personalized HTML private or no-store. This issue is fixed in versions 20.3.28, 21.2.20, and 22.1.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
angular angular <= 19.2.25 -

II. Public POCs for CVE-2026-88059

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III. Intelligence Information for CVE-2026-88059

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Vendor Pages for CVE-2026-88059 (2)

Other References for CVE-2026-88059 (7)

Same Patch Batch · angular · 2026-09-10 · 5 CVEs total

CVE-2026-88058 8.6 HIGH Angular: SSR XSS via Unescaped Processing Instruction (<?...?>) Nodes in Fallback Raw-Cont
CVE-2026-88056 8.6 HIGH Angular: SSRF and Cross-Origin Credential Disclosure via URL Resolution Discrepancy in SSR
CVE-2026-88060 8.6 HIGH Angular: SSR XSS via Unescaped <template> Content Across DocumentFragment Boundaries in Fa
CVE-2026-88057 5.3 MEDIUM Angular: Sanitization bypass via directive host bindings on concrete host elements in @ang

IV. Related Vulnerabilities

Same product: angular
Same vendor: angular
Same weakness: CWE-200

V. Comments for CVE-2026-88059

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