CVE-2026-50170: @angular/common Information Leak Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-q6f4-qqrg-jv6x",
  "modified" : "2026-07-15T22:05:10Z",
  "published" : "2026-06-15T16:51:53Z",
  "aliases" : [ "CVE-2026-50170" ],
  "summary" : "@angular/common: Information Leak via Default Caching of Credentialed Requests in HttpTransferCache",
  "details" : "A vulnerability was discovered in `@angular/common` when Server-Side Rendering (SSR) and hydration are enabled. The `HttpTransferCache` utility optimizes hydration by caching outgoing HTTP requests performed during SSR and transferring the cached state to the client-side application via `TransferState`.\n\nHowever, the caching mechanism fails to inspect the `withCredentials` flag or the `Cookie` header of outgoing requests. As a result, credentialed, user-specific responses may be cached by default in the shared `TransferState` payload. When these responses are serialized into the HTML, any caching layer (such as a CDN, reverse proxy, or shared server cache) that caches the SSR-rendered HTML page could inadvertently cache and leak one user's private data to other users, leading to a high-severity information disclosure vulnerability.\n\n### Impact\n\nSuccessful exploitation allows an unauthenticated attacker to obtain sensitive, user-specific information of other authenticated users. This occurs when:\n\n* The SSR-rendered HTML containing the cached private data is stored in a shared cache (e.g., CDN, reverse proxy).  \n* Subsequent requests for the same page receive the cached HTML containing the first user's private data.\n\n### Attack Preconditions\n\n* **SSR and Hydration Enabled:** The Angular application must be configured to use Server-Side Rendering and hydration (e.g., using `provideClientHydration()`).  \n* **Credentialed Requests during SSR:** The application must perform HTTP requests that require user-specific authentication (using cookies or `withCredentials: true`) during the initial server-side render.  \n* **Shared Caching:** The application's HTML responses must be cached by a shared caching layer (CDN, reverse proxy, or server-side cache) without proper cache-control headers to distinguish authenticated users.\n\n### Patches\n- 22.0.0-rc.2\n- 21.2.15\n- 20.3.22\n- 19.2.23",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@angular/common"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "22.0.0-next.0"
      }, {
        "fixed" : "22.0.0-rc.2"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@angular/common"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "20.0.0-next.0"
      }, {
        "fixed" : "20.3.22"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@angular/common"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "19.0.0-next.0"
      }, {
        "fixed" : "19.2.23"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@angular/common"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "18.2.14"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@angular/common"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "21.0.0-next.0"
      }, {
        "fixed" : "21.2.15"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/angular/angular/security/advisories/GHSA-q6f4-qqrg-jv6x"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-50170"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/angular/angular/pull/67964"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/angular/angular"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-524" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-06-15T16:51:53Z",
    "nvd_published_at" : "2026-06-22T18:16:42Z"
  }
}