diff --git a/lib/internal/crypto/cfrg.js b/lib/internal/crypto/cfrg.js
index 0a3ed7b9cf08f4..70948c83393f6f 100644
--- a/lib/internal/crypto/cfrg.js
+++ b/lib/internal/crypto/cfrg.js
@@ -275,6 +275,10 @@ async function cfrgImportKey(
         }
       }
 
+      if (!isPublic && typeof keyData.x !== 'string') {
+        throw lazyDOMException('Invalid JWK keyData', 'DataError');
+      }
+
       verifyAcceptableCfrgKeyUse(
         name,
         isPublic ? 'public' : 'private',
diff --git a/test/wpt/status/WebCryptoAPI.json b/test/wpt/status/WebCryptoAPI.json
index f6f0e154c6b9fa..6676317874c4b3 100644
--- a/test/wpt/status/WebCryptoAPI.json
+++ b/test/wpt/status/WebCryptoAPI.json
@@ -27,10 +27,6 @@
         "Bad key length: importKey(jwk (public) , {name: Ed25519}, false, [verify])",
         "Bad key length: importKey(jwk (public) , {name: Ed25519}, true, [verify, verify])",
         "Bad key length: importKey(jwk (public) , {name: Ed25519}, false, [verify, verify])",
-        "Missing JWK 'x' parameter: importKey(jwk(private), {name: Ed25519}, true, [sign])",
-        "Missing JWK 'x' parameter: importKey(jwk(private), {name: Ed25519}, false, [sign])",
-        "Missing JWK 'x' parameter: importKey(jwk(private), {name: Ed25519}, true, [sign, sign])",
-        "Missing JWK 'x' parameter: importKey(jwk(private), {name: Ed25519}, false, [sign, sign])",
         "Invalid key pair: importKey(jwk(private), {name: Ed25519}, true, [sign])",
         "Invalid key pair: importKey(jwk(private), {name: Ed25519}, true, [sign, sign])"
       ]
@@ -55,10 +51,6 @@
         "Bad key length: importKey(jwk (public) , {name: Ed448}, false, [verify])",
         "Bad key length: importKey(jwk (public) , {name: Ed448}, true, [verify, verify])",
         "Bad key length: importKey(jwk (public) , {name: Ed448}, false, [verify, verify])",
-        "Missing JWK 'x' parameter: importKey(jwk(private), {name: Ed448}, true, [sign])",
-        "Missing JWK 'x' parameter: importKey(jwk(private), {name: Ed448}, false, [sign])",
-        "Missing JWK 'x' parameter: importKey(jwk(private), {name: Ed448}, true, [sign, sign])",
-        "Missing JWK 'x' parameter: importKey(jwk(private), {name: Ed448}, false, [sign, sign])",
         "Invalid key pair: importKey(jwk(private), {name: Ed448}, true, [sign])",
         "Invalid key pair: importKey(jwk(private), {name: Ed448}, true, [sign, sign])"
       ]
@@ -95,14 +87,6 @@
         "Bad key length: importKey(jwk(private), {name: X25519}, false, [deriveBits])",
         "Bad key length: importKey(jwk(private), {name: X25519}, true, [deriveKey, deriveBits, deriveKey, deriveBits])",
         "Bad key length: importKey(jwk(private), {name: X25519}, false, [deriveKey, deriveBits, deriveKey, deriveBits])",
-        "Missing JWK 'x' parameter: importKey(jwk(private), {name: X25519}, true, [deriveKey])",
-        "Missing JWK 'x' parameter: importKey(jwk(private), {name: X25519}, false, [deriveKey])",
-        "Missing JWK 'x' parameter: importKey(jwk(private), {name: X25519}, true, [deriveBits, deriveKey])",
-        "Missing JWK 'x' parameter: importKey(jwk(private), {name: X25519}, false, [deriveBits, deriveKey])",
-        "Missing JWK 'x' parameter: importKey(jwk(private), {name: X25519}, true, [deriveBits])",
-        "Missing JWK 'x' parameter: importKey(jwk(private), {name: X25519}, false, [deriveBits])",
-        "Missing JWK 'x' parameter: importKey(jwk(private), {name: X25519}, true, [deriveKey, deriveBits, deriveKey, deriveBits])",
-        "Missing JWK 'x' parameter: importKey(jwk(private), {name: X25519}, false, [deriveKey, deriveBits, deriveKey, deriveBits])",
         "Invalid key pair: importKey(jwk(private), {name: X25519}, true, [deriveKey])",
         "Invalid key pair: importKey(jwk(private), {name: X25519}, true, [deriveBits, deriveKey])",
         "Invalid key pair: importKey(jwk(private), {name: X25519}, true, [deriveBits])",
@@ -141,14 +125,6 @@
         "Bad key length: importKey(jwk(private), {name: X448}, false, [deriveKey, deriveBits, deriveKey, deriveBits])",
         "Bad key length: importKey(jwk (public) , {name: X448}, true, [])",
         "Bad key length: importKey(jwk (public) , {name: X448}, false, [])",
-        "Missing JWK 'x' parameter: importKey(jwk(private), {name: X448}, true, [deriveKey])",
-        "Missing JWK 'x' parameter: importKey(jwk(private), {name: X448}, false, [deriveKey])",
-        "Missing JWK 'x' parameter: importKey(jwk(private), {name: X448}, true, [deriveBits, deriveKey])",
-        "Missing JWK 'x' parameter: importKey(jwk(private), {name: X448}, false, [deriveBits, deriveKey])",
-        "Missing JWK 'x' parameter: importKey(jwk(private), {name: X448}, true, [deriveBits])",
-        "Missing JWK 'x' parameter: importKey(jwk(private), {name: X448}, false, [deriveBits])",
-        "Missing JWK 'x' parameter: importKey(jwk(private), {name: X448}, true, [deriveKey, deriveBits, deriveKey, deriveBits])",
-        "Missing JWK 'x' parameter: importKey(jwk(private), {name: X448}, false, [deriveKey, deriveBits, deriveKey, deriveBits])",
         "Invalid key pair: importKey(jwk(private), {name: X448}, true, [deriveKey])",
         "Invalid key pair: importKey(jwk(private), {name: X448}, true, [deriveBits, deriveKey])",
         "Invalid key pair: importKey(jwk(private), {name: X448}, true, [deriveBits])",