diff --git a/core/trino-main/src/main/java/io/trino/server/security/oauth2/JweTokenSerializer.java b/core/trino-main/src/main/java/io/trino/server/security/oauth2/JweTokenSerializer.java
index 4a981e8256a1..68469303c613 100644
--- a/core/trino-main/src/main/java/io/trino/server/security/oauth2/JweTokenSerializer.java
+++ b/core/trino-main/src/main/java/io/trino/server/security/oauth2/JweTokenSerializer.java
@@ -109,7 +109,7 @@ public TokenPair deserialize(String token)
                     claims.get(REFRESH_TOKEN_KEY, String.class));
         }
         catch (ParseException ex) {
-            throw new IllegalArgumentException("Malformed jwt token", ex);
+            return TokenPair.accessToken(token);
         }
         catch (JOSEException ex) {
             throw new IllegalArgumentException("Decryption failed", ex);
diff --git a/core/trino-main/src/test/java/io/trino/server/security/oauth2/TestJweTokenSerializer.java b/core/trino-main/src/test/java/io/trino/server/security/oauth2/TestJweTokenSerializer.java
index 6d3c18ab576e..489891b983ff 100644
--- a/core/trino-main/src/test/java/io/trino/server/security/oauth2/TestJweTokenSerializer.java
+++ b/core/trino-main/src/test/java/io/trino/server/security/oauth2/TestJweTokenSerializer.java
@@ -91,6 +91,19 @@ public void testTokenDeserializationAfterTimeoutAndExpirationExtension()
                 .isExactlyInstanceOf(ExpiredJwtException.class);
     }
 
+    @Test
+    public void testTokenDeserializationWhenNonJWETokenIsPassed()
+            throws Exception
+    {
+        JweTokenSerializer serializer = tokenSerializer(new TestingClock(), succinctDuration(12, MINUTES));
+        String nonJWEToken = "non_jwe_token";
+
+        TokenPair tokenPair = serializer.deserialize(nonJWEToken);
+
+        assertThat(tokenPair.getAccessToken()).isEqualTo(nonJWEToken);
+        assertThat(tokenPair.getRefreshToken()).isEmpty();
+    }
+
     private JweTokenSerializer tokenSerializer(Clock clock, Duration tokenExpiration)
             throws GeneralSecurityException, KeyLengthException
     {