diff --git a/packages/backend/src/controllers/api/v1/admin/app-auth-clients/get-app-auth-client.test.js b/packages/backend/src/controllers/api/v1/admin/app-auth-clients/get-app-auth-client.test.js
index 51fa840b..fcd6d842 100644
--- a/packages/backend/src/controllers/api/v1/admin/app-auth-clients/get-app-auth-client.test.js
+++ b/packages/backend/src/controllers/api/v1/admin/app-auth-clients/get-app-auth-client.test.js
@@ -33,13 +33,20 @@ describe('GET /api/v1/admin/app-auth-clients/:appAuthClientId', () => {
       expect(response.body).toEqual(expectedPayload);
     });
 
-    it('should return not found response for not existing app auth client ID', async () => {
-      const invalidAppAuthClientId = Crypto.randomUUID();
+    it('should return not found response for not existing app auth client UUID', async () => {
+      const notExistingAppAuthClientUUID = Crypto.randomUUID();
 
       await request(app)
-        .get(`/api/v1/admin/app-auth-clients/${invalidAppAuthClientId}`)
+        .get(`/api/v1/admin/app-auth-clients/${notExistingAppAuthClientUUID}`)
         .set('Authorization', token)
         .expect(404);
     });
+
+    it('should return bad request response for invalid UUID', async () => {
+      await request(app)
+        .get('/api/v1/admin/app-auth-clients/invalidAppAuthClientUUID')
+        .set('Authorization', token)
+        .expect(400);
+    });
   });
 });
diff --git a/packages/backend/src/controllers/api/v1/admin/roles/get-role.ee.test.js b/packages/backend/src/controllers/api/v1/admin/roles/get-role.ee.test.js
index d083b171..bf2b7451 100644
--- a/packages/backend/src/controllers/api/v1/admin/roles/get-role.ee.test.js
+++ b/packages/backend/src/controllers/api/v1/admin/roles/get-role.ee.test.js
@@ -37,14 +37,23 @@ describe('GET /api/v1/admin/roles/:roleId', () => {
     expect(response.body).toEqual(expectedPayload);
   });
 
-  it('should return not found response for not existing role ID', async () => {
+  it('should return not found response for not existing role UUID', async () => {
     vi.spyOn(license, 'hasValidLicense').mockResolvedValue(true);
 
-    const invalidRoleId = Crypto.randomUUID();
+    const notExistingRoleUUID = Crypto.randomUUID();
 
     await request(app)
-      .get(`/api/v1/admin/roles/${invalidRoleId}`)
+      .get(`/api/v1/admin/roles/${notExistingRoleUUID}`)
       .set('Authorization', token)
       .expect(404);
   });
+
+  it('should return bad request response for invalid UUID', async () => {
+    vi.spyOn(license, 'hasValidLicense').mockResolvedValue(true);
+
+    await request(app)
+      .get('/api/v1/admin/roles/invalidRoleUUID')
+      .set('Authorization', token)
+      .expect(400);
+  });
 });
diff --git a/packages/backend/src/controllers/api/v1/admin/saml-auth-providers/get-saml-auth-provider.ee.test.js b/packages/backend/src/controllers/api/v1/admin/saml-auth-providers/get-saml-auth-provider.ee.test.js
index d78efc43..1f0b63e1 100644
--- a/packages/backend/src/controllers/api/v1/admin/saml-auth-providers/get-saml-auth-provider.ee.test.js
+++ b/packages/backend/src/controllers/api/v1/admin/saml-auth-providers/get-saml-auth-provider.ee.test.js
@@ -33,14 +33,25 @@ describe('GET /api/v1/admin/saml-auth-provider/:samlAuthProviderId', () => {
     expect(response.body).toEqual(expectedPayload);
   });
 
-  it('should return not found response for not existing saml auth provider ID', async () => {
+  it('should return not found response for not existing saml auth provider UUID', async () => {
     vi.spyOn(license, 'hasValidLicense').mockResolvedValue(true);
 
-    const invalidSamlAuthProviderId = Crypto.randomUUID();
+    const notExistingSamlAuthProviderUUID = Crypto.randomUUID();
 
     await request(app)
-      .get(`/api/v1/admin/saml-auth-providers/${invalidSamlAuthProviderId}`)
+      .get(
+        `/api/v1/admin/saml-auth-providers/${notExistingSamlAuthProviderUUID}`
+      )
       .set('Authorization', token)
       .expect(404);
   });
+
+  it('should return bad request response for invalid UUID', async () => {
+    vi.spyOn(license, 'hasValidLicense').mockResolvedValue(true);
+
+    await request(app)
+      .get('/api/v1/admin/saml-auth-providers/invalidSamlAuthProviderUUID')
+      .set('Authorization', token)
+      .expect(400);
+  });
 });
diff --git a/packages/backend/src/controllers/api/v1/admin/users/get-user.ee.test.js b/packages/backend/src/controllers/api/v1/admin/users/get-user.ee.test.js
index c9696cf2..6a3976b9 100644
--- a/packages/backend/src/controllers/api/v1/admin/users/get-user.ee.test.js
+++ b/packages/backend/src/controllers/api/v1/admin/users/get-user.ee.test.js
@@ -33,14 +33,23 @@ describe('GET /api/v1/admin/users/:userId', () => {
     expect(response.body).toEqual(expectedPayload);
   });
 
-  it('should return not found response for not existing user ID', async () => {
+  it('should return not found response for not existing user UUID', async () => {
     vi.spyOn(license, 'hasValidLicense').mockResolvedValue(true);
 
-    const invalidUserId = Crypto.randomUUID();
+    const notExistingUserUUID = Crypto.randomUUID();
 
     await request(app)
-      .get(`/api/v1/admin/users/${invalidUserId}`)
+      .get(`/api/v1/admin/users/${notExistingUserUUID}`)
       .set('Authorization', token)
       .expect(404);
   });
+
+  it('should return bad request response for invalid UUID', async () => {
+    vi.spyOn(license, 'hasValidLicense').mockResolvedValue(true);
+
+    await request(app)
+      .get('/api/v1/admin/users/invalidUserUUID')
+      .set('Authorization', token)
+      .expect(400);
+  });
 });
diff --git a/packages/backend/src/controllers/api/v1/app-auth-clients/get-app-auth-client.test.js b/packages/backend/src/controllers/api/v1/app-auth-clients/get-app-auth-client.test.js
index 4894b01f..6fcd494f 100644
--- a/packages/backend/src/controllers/api/v1/app-auth-clients/get-app-auth-client.test.js
+++ b/packages/backend/src/controllers/api/v1/app-auth-clients/get-app-auth-client.test.js
@@ -31,11 +31,18 @@ describe('GET /api/v1/app-auth-clients/:id', () => {
   });
 
   it('should return not found response for not existing app auth client ID', async () => {
-    const invalidAppAuthClientId = Crypto.randomUUID();
+    const notExistingAppAuthClientUUID = Crypto.randomUUID();
 
     await request(app)
-      .get(`/api/v1/app-auth-clients/${invalidAppAuthClientId}`)
+      .get(`/api/v1/app-auth-clients/${notExistingAppAuthClientUUID}`)
       .set('Authorization', token)
       .expect(404);
   });
+
+  it('should return bad request response for invalid UUID', async () => {
+    await request(app)
+      .get('/api/v1/app-auth-clients/invalidAppAuthClientUUID')
+      .set('Authorization', token)
+      .expect(400);
+  });
 });
diff --git a/packages/backend/src/controllers/api/v1/flows/get-flow.test.js b/packages/backend/src/controllers/api/v1/flows/get-flow.test.js
index 6bfc46d0..a3746d48 100644
--- a/packages/backend/src/controllers/api/v1/flows/get-flow.test.js
+++ b/packages/backend/src/controllers/api/v1/flows/get-flow.test.js
@@ -70,7 +70,7 @@ describe('GET /api/v1/flows/:flowId', () => {
     expect(response.body).toEqual(expectedPayload);
   });
 
-  it('should return not found response for not existing flow id', async () => {
+  it('should return not found response for not existing flow UUID', async () => {
     await createPermission({
       action: 'read',
       subject: 'Flow',
@@ -78,11 +78,25 @@ describe('GET /api/v1/flows/:flowId', () => {
       conditions: [],
     });
 
-    const invalidFlowId = Crypto.randomUUID();
+    const notExistingFlowUUID = Crypto.randomUUID();
 
     await request(app)
-      .get(`/api/v1/flows/${invalidFlowId}`)
+      .get(`/api/v1/flows/${notExistingFlowUUID}`)
       .set('Authorization', token)
       .expect(404);
   });
+
+  it('should return bad request response for invalid UUID', async () => {
+    await createPermission({
+      action: 'read',
+      subject: 'Flow',
+      roleId: currentUserRole.id,
+      conditions: [],
+    });
+
+    await request(app)
+      .get('/api/v1/flows/invalidFlowUUID')
+      .set('Authorization', token)
+      .expect(400);
+  });
 });