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chore(deps): update dependency @angular/common to v20.3.34 [security] - #2252

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This PR contains the following updates:

Package Change Age Confidence
@angular/common (source) 20.3.32 → 20.3.34 age confidence

@​angular/common: XSRF Token Leakage via URL Parsing Discrepancy in Angular HTTP Client (Incomplete fix for CVE-2025-66035)

CVE-2026-111753 / GHSA-jfgx-762w-99vr

More information

Details

An incomplete fix for GHSA-58c5-g7wp-6w37 (CVE-2025-66035) in @angular/common's HTTP Client (HttpClient) allows Cross-Site Request Forgery (XSRF) tokens to be leaked to attacker-controlled cross-origin domains when requests use URLs that exploit parsing discrepancies between regular expressions and the browser's WHATWG URL parser.

Technical Description

To address CVE-2025-66035, xsrfInterceptorFn introduced a regular expression (const ABSOLUTE_URL_REGEX = /^(?:https?:)?\/\//i) to detect and skip absolute and protocol-relative URLs before attaching the X-XSRF-TOKEN header.

However, browsers resolve request URLs passed to fetch() and XMLHttpRequest.open() using the WHATWG URL parser. For http: and https: schemes, the WHATWG URL standard performs several normalizations prior to resolving the authority/origin:

  • Backslashes (\) are treated as forward slashes (/) — e.g., /\evil.example/x, \\evil.example/x, \/evil.example/x, https:\\evil.example/x, https:/\evil.example/x.
  • Leading and trailing C0 control characters and spaces (<= 0x20) are stripped — e.g., ' //evil.example/x', '\0//evil.example/x', '\x1f//evil.example/x'.
  • ASCII tab (\t), newline (\n), and carriage return (\r) characters are removed anywhere in the input — e.g., '/\t/evil.example/x', '/\n/evil.example/x', 'htt\tps://evil.example/x'.

Because these URLs do not match /^(?:https?:)?\/\//i, xsrfInterceptorFn treats them as relative same-origin URLs and attaches the X-XSRF-TOKEN header, while the browser resolves and dispatches the request to the cross-origin host (evil.example).

Note: Angular 21.0.3+ and 22.x replaced the regular expression with a WHATWG new URL(req.url, locationOrigin) origin comparison in #​65683 and were already unaffected. However, the 20.3.x LTS branch retained the regular expression until 20.3.34.

Impact

The token leakage bypasses Angular's built-in XSRF protection on affected versions, allowing an attacker to capture the user's valid X-XSRF-TOKEN header if their server permits the request and custom header via CORS. Once obtained, the attacker can perform Cross-Site Request Forgery (CSRF) attacks against the victim user's session.

Attack Preconditions
  1. The victim's Angular application must have XSRF protection enabled (enabled by default in HttpClient).
  2. The attacker must be able to make the application send a state-changing HTTP request (e.g., POST, PUT, DELETE, PATCH) to a URL they control (such as /\attacker.example/api or //attacker.example/api).
Patches

The issue is resolved by parsing and comparing the request URL's origin against the application's current origin using the standard URL constructor (new URL(req.url, locationOrigin)).

  • 21.0.3 (and all 22.x releases)
  • 20.3.34
Workarounds

If you cannot immediately upgrade to a patched version:

  • Validate and normalize outgoing request URLs using new URL(url, window.location.origin) and verify that parsedUrl.origin === window.location.origin before passing dynamic URLs to mutating HttpClient requests.
  • Avoid passing untrusted or user-controlled URLs to HttpClient mutating methods.

Severity

  • CVSS Score: 5.9 / 10 (Medium)
  • Vector String: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

References

This data is provided by the GitHub Advisory Database (CC-BY 4.0).


Release Notes

angular/angular (@​angular/common)

v20.3.34

Compare Source

core
Commit Type Description
fc0e50a2d2 fix i18n flags leaking on errors
http
Commit Type Description
933ce817d5 fix enable XSRF protection for same-origin absolute URLs

v20.3.33

Compare Source

platform-server
Commit Type Description
83944fc8c5 fix reject protocol-relative paths in resolveUrl
router
Commit Type Description
142f187b3c fix do not copy URL-sized objects into every route snapshot
cd8efcb924 fix reject duplicate outlets in production builds
b0d2ba0f54 fix require outlets to match a route before processing child segments

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⚠️ No Changeset found

Latest commit: 8b32d01

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Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff Package Supply Chain
Security
Vulnerability Quality Maintenance License
Updatednpm/​@​angular/​common@​20.3.32 ⏵ 20.3.34100100 +279 +198100

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Size Change: 0 B

Total Size: 220 kB

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