diff --git a/src/VCS/Adapter.php b/src/VCS/Adapter.php
index 1479fbe..43f8816 100644
--- a/src/VCS/Adapter.php
+++ b/src/VCS/Adapter.php
@@ -252,6 +252,15 @@ abstract public function getCommit(string $owner, string $repositoryName, string
      */
     abstract public function getLatestCommit(string $owner, string $repositoryName, string $branch): array;
 
+    /**
+     * Check if user is a member of an organization
+     *
+     * @param  string  $username Username of the user
+     * @param  string  $organization Name of the organization
+     * @return bool True if user is a member of the organization, false otherwise
+     */
+    abstract public function isUserMemberOfOrganization(string $username, string $organization): bool;
+
     /**
      * Call
      *
diff --git a/src/VCS/Adapter/Git/GitHub.php b/src/VCS/Adapter/Git/GitHub.php
index fd78e23..94b986d 100644
--- a/src/VCS/Adapter/Git/GitHub.php
+++ b/src/VCS/Adapter/Git/GitHub.php
@@ -640,7 +640,14 @@ public function getEvent(string $event, string $payload): array
                 $authorAvatarUrl = $payload['pull_request']['user']['avatar_url'] ?? '';
                 $commitHash = $payload['pull_request']['head']['sha'] ?? '';
                 $headCommitUrl = $repositoryUrl . "/commits/" . $commitHash;
-                $external = $payload['pull_request']['head']['user']['login'] !== $payload['pull_request']['base']['user']['login'];
+
+                $authorUsername = $payload['pull_request']['user']['login'] ?? ($payload['pull_request']['head']['user']['login'] ?? '');
+                $isOrgRepository = ($payload['repository']['owner']['type'] ?? '') === 'Organization';
+                if ($isOrgRepository) {
+                    $external = !$this->isUserMemberOfOrganization($authorUsername, $owner);
+                } else {
+                    $external = $authorUsername !== $owner;
+                }
 
                 return [
                     'branch' => $branch,
@@ -686,4 +693,11 @@ public function validateWebhookEvent(string $payload, string $signature, string
     {
         return $signature === ('sha256=' . hash_hmac('sha256', $payload, $signatureKey));
     }
+
+    public function isUserMemberOfOrganization(string $username, string $organization): bool
+    {
+        $url = "/orgs/{$organization}/memberships/{$username}";
+        $response = $this->call(self::METHOD_GET, $url, ['Authorization' => "Bearer $this->accessToken"]);
+        return $response['headers']['status-code'] >= 200 && $response['headers']['status-code'] < 300;
+    }
 }
diff --git a/tests/VCS/Adapter/GitHubTest.php b/tests/VCS/Adapter/GitHubTest.php
index 6bf4057..3e2c540 100644
--- a/tests/VCS/Adapter/GitHubTest.php
+++ b/tests/VCS/Adapter/GitHubTest.php
@@ -340,4 +340,13 @@ public function testGetLatestCommit(): void
         $this->assertEquals('https://avatars.githubusercontent.com/u/43381712?v=4', $commitDetails['commitAuthorAvatar']);
         $this->assertEquals('https://github.com/vermakhushboo', $commitDetails['commitAuthorUrl']);
     }
+
+    public function testIsUserMemberOfOrganization(): void
+    {
+        $isMember = $this->vcsAdapter->isUserMemberOfOrganization('vermakhushboo', 'test-kh');
+        $this->assertTrue($isMember);
+
+        $isNotMember = $this->vcsAdapter->isUserMemberOfOrganization('test-user', 'test-kh');
+        $this->assertFalse($isNotMember);
+    }
 }