CVE-2026-88059
Angular: Information Leak via `HttpTransferCache` Bypass When Using `withRequestsMadeViaParent`
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.
INFO
Published Date :
Sept. 10, 2026, 7:17 p.m.
Last Modified :
Sept. 29, 2026, 9:09 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update Angular to versions 20.3.28, 21.2.20, or 22.1.1.
- Filter sensitive endpoints using withHttpTransferCacheOptions.
- Disable transfer caching for sensitive routes.
- Mark personalized HTML as private or no-store.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-88059.
| URL | Resource |
|---|---|
| https://github.com/angular/angular/commit/c45028e44f5f3c1e0006eaccf86642deca51b2af | Patch |
| https://github.com/angular/angular/commit/caf616670fd20d528aa69e0131cc17d60f0cc27d | Patch |
| https://github.com/angular/angular/commit/e4c416c20a1cb222ce73d29c035452b257380c56 | Patch |
| https://github.com/angular/angular/issues/69777 | Issue Tracking Patch |
| https://github.com/angular/angular/pull/69778 | Issue Tracking Patch |
| https://github.com/angular/angular/releases/tag/v20.3.28 | Release Notes |
| https://github.com/angular/angular/releases/tag/v21.2.20 | Release Notes |
| https://github.com/angular/angular/releases/tag/v22.1.1 | Release Notes |
| https://github.com/angular/angular/security/advisories/GHSA-p297-fm68-3q8c | Exploit Mitigation Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-88059 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-88059
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-88059 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-88059 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Sep. 29, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N Added CPE Configuration OR *cpe:2.3:a:angular:angular:*:*:*:*:*:node.js:*:* versions from (including) 19.0.0 up to (including) 19.2.25 *cpe:2.3:a:angular:angular:*:*:*:*:*:node.js:*:* versions from (including) 20.0.0 up to (excluding) 20.3.28 *cpe:2.3:a:angular:angular:*:*:*:*:*:node.js:*:* versions from (including) 21.0.0 up to (excluding) 21.2.20 *cpe:2.3:a:angular:angular:*:*:*:*:*:node.js:*:* versions from (including) 22.0.0 up to (excluding) 22.1.1 Added Reference Type GitHub, Inc.: https://github.com/angular/angular/commit/c45028e44f5f3c1e0006eaccf86642deca51b2af Types: Patch Added Reference Type GitHub, Inc.: https://github.com/angular/angular/commit/caf616670fd20d528aa69e0131cc17d60f0cc27d Types: Patch Added Reference Type GitHub, Inc.: https://github.com/angular/angular/commit/e4c416c20a1cb222ce73d29c035452b257380c56 Types: Patch Added Reference Type GitHub, Inc.: https://github.com/angular/angular/issues/69777 Types: Issue Tracking, Patch Added Reference Type GitHub, Inc.: https://github.com/angular/angular/pull/69778 Types: Issue Tracking, Patch Added Reference Type GitHub, Inc.: https://github.com/angular/angular/releases/tag/v20.3.28 Types: Release Notes Added Reference Type GitHub, Inc.: https://github.com/angular/angular/releases/tag/v21.2.20 Types: Release Notes Added Reference Type GitHub, Inc.: https://github.com/angular/angular/releases/tag/v22.1.1 Types: Release Notes Added Reference Type GitHub, Inc.: https://github.com/angular/angular/security/advisories/GHSA-p297-fm68-3q8c Types: Exploit, Mitigation, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Sep. 11, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-88059', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-09-11T17:49:17.182667Z'} -
New CVE Received by [email protected]
Sep. 10, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N Added CWE CWE-200 Added CWE CWE-524 Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/88xxx/CVE-2026-88059.json">CVE-2026-88059</a> Added Reference https://github.com/angular/angular/commit/c45028e44f5f3c1e0006eaccf86642deca51b2af Added Reference https://github.com/angular/angular/commit/caf616670fd20d528aa69e0131cc17d60f0cc27d Added Reference https://github.com/angular/angular/commit/e4c416c20a1cb222ce73d29c035452b257380c56 Added Reference https://github.com/angular/angular/issues/69777 Added Reference https://github.com/angular/angular/pull/69778 Added Reference https://github.com/angular/angular/releases/tag/v20.3.28 Added Reference https://github.com/angular/angular/releases/tag/v21.2.20 Added Reference https://github.com/angular/angular/releases/tag/v22.1.1 Added Reference https://github.com/angular/angular/security/advisories/GHSA-p297-fm68-3q8c