CVE-2026-50184: @angular/service-worker Request Credential & Cache Policy Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-95qp-cmmw-mgqv",
  "modified" : "2026-07-15T22:05:21Z",
  "published" : "2026-06-15T17:13:05Z",
  "aliases" : [ "CVE-2026-50184" ],
  "summary" : "@angular/service-worker: Request Credential & Cache Policy Stripping",
  "details" : "An issue in the `@angular/service-worker` package compromises the integrity of request-policy enforcement during request reconstruction. When the Angular Service Worker intercepts network requests for matched assets, it reconstructs a new `Request` object using an internal helper function.\n\nDuring this reconstruction process, the helper function strips explicit client-defined safety parameters: the credentials configuration (such as `credentials: 'omit'`) and the HTTP `cache` mode configuration (such as `cache: 'no-store'`). These are reverted back to standard browser-default parameters (`credentials: 'same-origin'` and default HTTP cache properties).\n\nThis causes the browser to include active credentials (such as cookies or Authorization headers) on outbound requests where the client-side developer explicitly instructed they should be omitted, leading to potential session leaks. Additionally, it causes private or non-cacheable resources to be cached by the service worker's engine, making private page states accessible or persistent inside the client's local cache post-logout.\n\n### Impact\nWeb applications registering the `@angular/service-worker` package are vulnerable to credential exposure or post-logout cache persistence if client-side code relies on fetch calls with explicit safety attributes (such as `{ credentials: 'omit' }` or `{ cache: 'no-store' }`) targeting paths matched by service worker asset groups. \n\nBy stripping these safety boundaries, the service worker exposes same-origin cookies and dynamic sensitive data to endpoints that should not receive them, or retains dynamic user sessions in cache storage where logout operations fail to fully evict user records.\n\n### Attack Preconditions\nTo successfully exploit this vulnerability, all of the following application states and parameters must concurrently exist:\n1. **Active Angular Service Worker:** The target application uses `@angular/service-worker` and has an active registration of `ngsw-worker.js` inside the client's browser context.\n2. **Asset Group Matching:** An `assetGroups` pattern in `ngsw-config.json` encompasses the target dynamic routing endpoint.\n3. **Established User Session:** The victim user currently has an active authentication state, such as valid same-origin session cookies or auth headers stored by the browser.\n4. **Client-Side Safe Fetch Call:** The application initiates an explicit fetch request to the route with safety parameters: `{ credentials: 'omit' }` or specific cache control parameters (e.g. `{ cache: 'no-store' }`).\n\n### Mitigations & Workarounds\nIf upgrading the `@angular/service-worker` package is not immediately feasible, developers should implement the following defensive measures:\n* **Strict Cookie Configuration:** Apply strict flags to session cookies (`SameSite=Strict; Secure; HttpOnly`) and ensure complete route isolation for credential-guarded secure resources.\n* **Exclude Secure Endpoints from SW Config:** Ensure that patterns targeting dynamic, secure endpoints are explicitly excluded from automatic asset groups or caching scopes in your `ngsw-config.json`.\n* **Post-Logout Cache Invalidation:** Programmatically purge the browser's Cache Storage API entries registered by the Angular Service Worker upon user logout:\n  ```javascript\n  if ('caches' in window) {\n    caches.keys().then(names => {\n      for (let name of names) {\n        if (name.startsWith('ngsw:')) {\n          caches.delete(name);\n        }\n      }\n    });\n  }\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:R/S:C/C:L/I:L/A:N"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@angular/service-worker"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "22.0.0-next.0"
      }, {
        "fixed" : "22.0.0-rc.2"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@angular/service-worker"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "21.0.0-next.0"
      }, {
        "fixed" : "21.2.15"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@angular/service-worker"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "20.0.0-next.0"
      }, {
        "fixed" : "20.3.22"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@angular/service-worker"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "19.0.0-next.0"
      }, {
        "fixed" : "19.2.23"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@angular/service-worker"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "18.2.14"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/angular/angular/security/advisories/GHSA-95qp-cmmw-mgqv"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-50184"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/angular/angular/pull/68904"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/angular/angular"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-200", "CWE-524" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-06-15T17:13:05Z",
    "nvd_published_at" : "2026-06-22T18:16:42Z"
  }
}