diff --git a/backend/test_observer/common/constants.py b/backend/test_observer/common/constants.py
index 1ab58f6b..15c32ec2 100644
--- a/backend/test_observer/common/constants.py
+++ b/backend/test_observer/common/constants.py
@@ -1 +1,3 @@
 PREVIOUS_TEST_RESULT_COUNT = 10
+
+VALID_ISSUE_HOSTS = {"github.com", "warthogs.atlassian.net", "bugs.launchpad.net"}
diff --git a/backend/test_observer/controllers/environments/models.py b/backend/test_observer/controllers/environments/models.py
index f67a5271..747dd7ac 100644
--- a/backend/test_observer/controllers/environments/models.py
+++ b/backend/test_observer/controllers/environments/models.py
@@ -1,6 +1,8 @@
 from datetime import datetime
 
-from pydantic import BaseModel, HttpUrl
+from pydantic import BaseModel, HttpUrl, field_validator
+
+from test_observer.common.constants import VALID_ISSUE_HOSTS
 
 
 class ReportedIssueRequest(BaseModel):
@@ -8,6 +10,15 @@ class ReportedIssueRequest(BaseModel):
     description: str
     url: HttpUrl
 
+    @field_validator("url")
+    @classmethod
+    def name_must_contain_space(
+        cls: type["ReportedIssueRequest"], url: HttpUrl
+    ) -> HttpUrl:
+        if url.host not in VALID_ISSUE_HOSTS:
+            raise ValueError(f"Issue url must belong to one of {VALID_ISSUE_HOSTS}")
+        return url
+
 
 class ReportedIssueResponse(BaseModel):
     id: int
diff --git a/backend/test_observer/controllers/test_cases/models.py b/backend/test_observer/controllers/test_cases/models.py
index 78c3fb89..6b70eeae 100644
--- a/backend/test_observer/controllers/test_cases/models.py
+++ b/backend/test_observer/controllers/test_cases/models.py
@@ -1,6 +1,8 @@
 from datetime import datetime
 
-from pydantic import BaseModel, HttpUrl, model_validator
+from pydantic import BaseModel, HttpUrl, field_validator, model_validator
+
+from test_observer.common.constants import VALID_ISSUE_HOSTS
 
 
 class ReportedIssueRequest(BaseModel):
@@ -13,8 +15,18 @@ class ReportedIssueRequest(BaseModel):
     def check_a_or_b(self):
         if not self.case_name and not self.template_id:
             raise ValueError("Either case_name or template_id is required")
+
         return self
 
+    @field_validator("url")
+    @classmethod
+    def name_must_contain_space(
+        cls: type["ReportedIssueRequest"], url: HttpUrl
+    ) -> HttpUrl:
+        if url.host not in VALID_ISSUE_HOSTS:
+            raise ValueError(f"Issue url must belong to one of {VALID_ISSUE_HOSTS}")
+        return url
+
 
 class ReportedIssueResponse(BaseModel):
     id: int
diff --git a/backend/tests/controllers/environments/test_environment_issues.py b/backend/tests/controllers/environments/test_environment_issues.py
index b794da4f..321364c3 100644
--- a/backend/tests/controllers/environments/test_environment_issues.py
+++ b/backend/tests/controllers/environments/test_environment_issues.py
@@ -6,7 +6,7 @@
 endpoint = "/v1/environments/reported-issues"
 valid_post_data = {
     "environment_name": "template 1",
-    "url": "http://issue.link/",
+    "url": "https://github.com/",
     "description": "some description",
 }
 
@@ -30,6 +30,17 @@ def test_post_validates_url(test_client: TestClient):
     assert_fails_validation(response, "url", "url_parsing")
 
 
+def test_url_cannot_be_canonical_chat(test_client: TestClient):
+    response = test_client.post(
+        endpoint,
+        json={
+            **valid_post_data,
+            "url": "https://chat.canonical.com/canonical/pl/n7oahef13jdpde7p6nf7s5yisw",
+        },
+    )
+    assert response.status_code == 422
+
+
 def test_valid_post(test_client: TestClient):
     response = test_client.post(endpoint, json=valid_post_data)
     assert response.status_code == 200
diff --git a/backend/tests/controllers/test_cases/test_reported_issues.py b/backend/tests/controllers/test_cases/test_reported_issues.py
index 693be2ab..e82d12ac 100644
--- a/backend/tests/controllers/test_cases/test_reported_issues.py
+++ b/backend/tests/controllers/test_cases/test_reported_issues.py
@@ -11,7 +11,7 @@
 valid_post_data = {
     "template_id": "template 1",
     "case_name": "case",
-    "url": "http://issue.link/",
+    "url": "https://github.com/",
     "description": "some description",
 }
 
@@ -81,6 +81,16 @@ def test_post_validates_url(post: Post):
     assert_fails_validation(response, "url", "url_parsing")
 
 
+def test_url_cannot_be_canonical_chat(post: Post):
+    response = post(
+        {
+            **valid_post_data,
+            "url": "https://chat.canonical.com/canonical/pl/n7oahef13jdpde7p6nf7s5yisw",
+        }
+    )
+    assert response.status_code == 422
+
+
 def test_valid_template_id_post(post: Post):
     data = {k: v for k, v in valid_post_data.items() if k != "case_name"}
     response = post(data)