diff --git a/apps/oauth2/lib/Migration/Version011901Date20240829164356.php b/apps/oauth2/lib/Migration/Version011901Date20240829164356.php
index 9ce9ff371cb..20f5754bf11 100644
--- a/apps/oauth2/lib/Migration/Version011901Date20240829164356.php
+++ b/apps/oauth2/lib/Migration/Version011901Date20240829164356.php
@@ -23,7 +23,7 @@ class Version011901Date20240829164356 extends SimpleMigrationStep {
 	) {
 	}
 
-	public function postSchemaChange(IOutput $output, Closure $schemaClosure, array $options) {
+	public function postSchemaChange(IOutput $output, Closure $schemaClosure, array $options): void {
 		$qbUpdate = $this->connection->getQueryBuilder();
 		$qbUpdate->update('oauth2_clients')
 			->set('secret', $qbUpdate->createParameter('updateSecret'))
diff --git a/apps/oauth2/src/components/OAuthItem.vue b/apps/oauth2/src/components/OAuthItem.vue
index aaf2f2ecd92..f2f6d518b2c 100644
--- a/apps/oauth2/src/components/OAuthItem.vue
+++ b/apps/oauth2/src/components/OAuthItem.vue
@@ -37,7 +37,13 @@
 				</tr>
 				<tr>
 					<td>{{ t('oauth2', 'Secret') }}</td>
-					<td><code>{{ renderedSecret }}</code><a v-if="clientSecret !== ''" class="icon-toggle has-tooltip" :title="t('oauth2', 'Show client secret')" @click="toggleSecret" /></td>
+					<td>
+						<code>{{ renderedSecret }}</code>
+						<a v-if="clientSecret !== ''"
+							class="icon-toggle has-tooltip"
+							:title="t('oauth2', 'Show client secret')"
+							@click="toggleSecret" />
+					</td>
 				</tr>
 			</table>
 		</td>
diff --git a/apps/oauth2/tests/Controller/OauthApiControllerTest.php b/apps/oauth2/tests/Controller/OauthApiControllerTest.php
index f3ffbfe7991..e1864b9612a 100644
--- a/apps/oauth2/tests/Controller/OauthApiControllerTest.php
+++ b/apps/oauth2/tests/Controller/OauthApiControllerTest.php
@@ -278,7 +278,7 @@ class OauthApiControllerTest extends TestCase {
 
 		$client = new Client();
 		$client->setClientIdentifier('clientId');
-		$client->setSecret('hashedClientSecret');
+		$client->setSecret(bin2hex('hashedClientSecret'));
 		$this->clientMapper->method('getByUid')
 			->with(42)
 			->willReturn($client);
@@ -303,7 +303,7 @@ class OauthApiControllerTest extends TestCase {
 
 		$client = new Client();
 		$client->setClientIdentifier('clientId');
-		$client->setSecret('hashedClientSecret');
+		$client->setSecret(bin2hex('hashedClientSecret'));
 		$this->clientMapper->method('getByUid')
 			->with(42)
 			->willReturn($client);
@@ -341,7 +341,7 @@ class OauthApiControllerTest extends TestCase {
 
 		$client = new Client();
 		$client->setClientIdentifier('clientId');
-		$client->setSecret('hashedClientSecret');
+		$client->setSecret(bin2hex('hashedClientSecret'));
 		$this->clientMapper->method('getByUid')
 			->with(42)
 			->willReturn($client);
@@ -437,7 +437,7 @@ class OauthApiControllerTest extends TestCase {
 
 		$client = new Client();
 		$client->setClientIdentifier('clientId');
-		$client->setSecret('hashedClientSecret');
+		$client->setSecret(bin2hex('hashedClientSecret'));
 		$this->clientMapper->method('getByUid')
 			->with(42)
 			->willReturn($client);
@@ -536,7 +536,7 @@ class OauthApiControllerTest extends TestCase {
 
 		$client = new Client();
 		$client->setClientIdentifier('clientId');
-		$client->setSecret('hashedClientSecret');
+		$client->setSecret(bin2hex('hashedClientSecret'));
 		$this->clientMapper->method('getByUid')
 			->with(42)
 			->willReturn($client);
diff --git a/apps/oauth2/tests/Controller/SettingsControllerTest.php b/apps/oauth2/tests/Controller/SettingsControllerTest.php
index 191ee8de53b..39948595cbf 100644
--- a/apps/oauth2/tests/Controller/SettingsControllerTest.php
+++ b/apps/oauth2/tests/Controller/SettingsControllerTest.php
@@ -109,7 +109,7 @@ class SettingsControllerTest extends TestCase {
 		$client = new Client();
 		$client->setName('My Client Name');
 		$client->setRedirectUri('https://example.com/');
-		$client->setSecret('MyHashedSecret');
+		$client->setSecret(bin2hex('MyHashedSecret'));
 		$client->setClientIdentifier('MyClientIdentifier');
 
 		$this->clientMapper
@@ -118,7 +118,7 @@ class SettingsControllerTest extends TestCase {
 			->with($this->callback(function (Client $c) {
 				return $c->getName() === 'My Client Name' &&
 					$c->getRedirectUri() === 'https://example.com/' &&
-					$c->getSecret() === 'MyHashedSecret' &&
+					$c->getSecret() === bin2hex('MyHashedSecret') &&
 					$c->getClientIdentifier() === 'MyClientIdentifier';
 			}))->willReturnCallback(function (Client $c) {
 				$c->setId(42);
@@ -161,7 +161,7 @@ class SettingsControllerTest extends TestCase {
 		$client->setId(123);
 		$client->setName('My Client Name');
 		$client->setRedirectUri('https://example.com/');
-		$client->setSecret('MyHashedSecret');
+		$client->setSecret(bin2hex('MyHashedSecret'));
 		$client->setClientIdentifier('MyClientIdentifier');
 
 		$this->clientMapper