CVE-2026-88057: Angular Sanitization Bypass Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-hh8m-fm6v-7cvg",
  "modified" : "2026-09-10T20:18:03Z",
  "published" : "2026-09-10T20:18:02Z",
  "aliases" : [ "CVE-2026-88057" ],
  "summary" : "Angular: Sanitization bypass via directive host bindings on concrete host elements in @angular/core and @angular/compiler",
  "details" : "Angular automatically sanitizes untrusted values bound to security-sensitive DOM sinks (such as `href`, `src`, `action`, `xlink:href`, and `data`) to protect against Cross-Site Scripting (XSS).\n\nPrior to the fix, the Angular compiler determined the `SecurityContext` for directive host bindings (`host: {'[attr.href]': 'value'}` or `@HostBinding('attr.href')`) based solely on the declaring directive or component selector at compile time, rather than the concrete host element that the directive was applied to.\n\nWhen a directive with a security-sensitive host binding was applied to a different concrete host element—such as through:\n- `hostDirectives` composition,\n- Class inheritance of host bindings,\n- Dynamic component instantiation (`createComponent` with custom `hostElement` or dynamic directives),\n- Elements with SVG/MathML namespaces (e.g. `<svg:a>`, `<math>`), or\n- Elements using tag-neutral selectors (e.g. `:not(...)`),\n\nthe compiler either failed to associate a sanitizer with the host binding or attached an incorrect security context. As a result, untrusted inputs (e.g. `javascript:...` URLs) bound via the host binding would be written to the DOM attribute without passing through Angular's built-in sanitizer.\n\n### Impact\nAn attacker capable of controlling the value bound to an affected directive host binding could execute arbitrary JavaScript in the user's browser context (Cross-Site Scripting).\n\n### Patches\nThis issue has been resolved in versions:\n- `22.1.0` \n- `21.2.20`\n- `20.3.28`\n\n### Workarounds\nEnsure that any user-controlled values assigned to properties bound via directive host bindings are explicitly sanitized using `DomSanitizer.sanitize(SecurityContext.URL, ...)` before assignment, or restrict the input to validated safe URL schemes (e.g. `http://`, `https://`).",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@angular/core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "22.0.0"
      }, {
        "fixed" : "22.1.0"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@angular/compiler"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "22.0.0"
      }, {
        "fixed" : "22.1.0"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@angular/core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "21.0.0"
      }, {
        "fixed" : "21.2.20"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@angular/compiler"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "21.0.0"
      }, {
        "fixed" : "21.2.20"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@angular/core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "20.0.0"
      }, {
        "fixed" : "20.3.28"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@angular/compiler"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "20.0.0"
      }, {
        "fixed" : "20.3.28"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@angular/core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "19.2.25"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@angular/compiler"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "19.2.25"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/angular/angular/security/advisories/GHSA-hh8m-fm6v-7cvg"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/angular/angular/issues/69550"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/angular/angular/pull/69558"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/angular/angular/commit/2f96c8020f85ccb715a76de4b79a0c680c2c7264"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/angular/angular/commit/6afe6fa781c2f0931f0aedd729b9884a8fe212ee"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/angular/angular/commit/6caa298dee58319b2d674dc91364e26ffe3ecb2b"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/angular/angular"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/angular/angular/releases/tag/v20.3.28"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/angular/angular/releases/tag/v21.2.20"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/angular/angular/releases/tag/v22.1.0"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-09-10T20:18:02Z",
    "nvd_published_at" : null
  }
}