diff --git a/application/src/main/resources/thingsboard.yml b/application/src/main/resources/thingsboard.yml
index 79bf8a9706..81b56aff28 100644
--- a/application/src/main/resources/thingsboard.yml
+++ b/application/src/main/resources/thingsboard.yml
@@ -215,12 +215,15 @@ security:
     #   - Widgets loading external resources (images, fonts, scripts)
     #   - Dashboard embedding via iframes (if frame-ancestors is restrictive)
     # Use 'report-only: true' first to test the impact before enforcing.
-    # Example value: "default-src 'self'; script-src 'self' 'unsafe-inline' 'unsafe-eval'; style-src 'self' 'unsafe-inline'; frame-ancestors 'self'"
+    # The default value covers core ThingsBoard functionality including OpenStreetMap, ArcGIS maps,
+    # solution template previews, WebSocket telemetry, and chart Web Workers.
+    # NOTE: Google Maps requires adding Google domains to script-src, which is not included by default.
+    # To add Google Maps support, append to script-src: https://maps.googleapis.com https://maps.gstatic.com
     content-security-policy:
       # Enable/disable Content-Security-Policy header. Mitigates XSS and data injection attacks
       enabled: "${SECURITY_HEADERS_CONTENT_SECURITY_POLICY_ENABLED:false}"
-      # Full CSP directive string
-      value: "${SECURITY_HEADERS_CONTENT_SECURITY_POLICY_VALUE:}"
+      # Full CSP directive string. The default value is a working policy for most ThingsBoard deployments
+      value: "${SECURITY_HEADERS_CONTENT_SECURITY_POLICY_VALUE:default-src 'self'; script-src 'self' 'unsafe-inline' 'unsafe-eval'; style-src 'self' 'unsafe-inline'; img-src 'self' data: blob: https://img.thingsboard.io https://tile.openstreetmap.org https://*.tile.openstreetmap.org https://*.arcgis.com; font-src 'self' data:; connect-src 'self' ws: wss: https://*.arcgis.com https://*.arcgisonline.com; worker-src 'self' blob:; frame-ancestors 'self'}"
       # If true, uses Content-Security-Policy-Report-Only header instead — the browser
       # reports violations but does not enforce them. Use for testing before enforcing.
       report-only: "${SECURITY_HEADERS_CONTENT_SECURITY_POLICY_REPORT_ONLY:false}"
diff --git a/common/util/src/test/java/org/thingsboard/common/util/SsrfProtectionValidatorTest.java b/common/util/src/test/java/org/thingsboard/common/util/SsrfProtectionValidatorTest.java
index d2d1be80c9..77f915c09c 100644
--- a/common/util/src/test/java/org/thingsboard/common/util/SsrfProtectionValidatorTest.java
+++ b/common/util/src/test/java/org/thingsboard/common/util/SsrfProtectionValidatorTest.java
@@ -29,7 +29,7 @@ import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.api.Assertions.assertThatNoException;
 import static org.assertj.core.api.Assertions.assertThatThrownBy;
 
-@ResourceLock("SsrfProtectionValidatorTest") // some tests mutate static additional-blocked-hosts
+@ResourceLock("SsrfProtectionValidator") // to avoid race conditions when modifying SsrfProtectionValidator's static configuration
 public class SsrfProtectionValidatorTest {
 
     @ParameterizedTest
diff --git a/rule-engine/rule-engine-components/src/test/java/org/thingsboard/rule/engine/rest/SsrfSafeAddressResolverGroupTest.java b/rule-engine/rule-engine-components/src/test/java/org/thingsboard/rule/engine/rest/SsrfSafeAddressResolverGroupTest.java
index 99506d3d12..fc3b825d36 100644
--- a/rule-engine/rule-engine-components/src/test/java/org/thingsboard/rule/engine/rest/SsrfSafeAddressResolverGroupTest.java
+++ b/rule-engine/rule-engine-components/src/test/java/org/thingsboard/rule/engine/rest/SsrfSafeAddressResolverGroupTest.java
@@ -37,7 +37,7 @@ import java.util.concurrent.TimeUnit;
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.api.Assertions.assertThatThrownBy;
 
-@ResourceLock("SsrfSafeAddressResolverGroupTest")
+@ResourceLock("SsrfProtectionValidator") // to avoid race conditions when modifying SsrfProtectionValidator's static configuration
 class SsrfSafeAddressResolverGroupTest {
 
     private static NioEventLoopGroup eventLoopGroup;
diff --git a/rule-engine/rule-engine-components/src/test/java/org/thingsboard/rule/engine/rest/TbHttpClientTest.java b/rule-engine/rule-engine-components/src/test/java/org/thingsboard/rule/engine/rest/TbHttpClientTest.java
index 6363e1032a..a33d25b038 100644
--- a/rule-engine/rule-engine-components/src/test/java/org/thingsboard/rule/engine/rest/TbHttpClientTest.java
+++ b/rule-engine/rule-engine-components/src/test/java/org/thingsboard/rule/engine/rest/TbHttpClientTest.java
@@ -22,6 +22,7 @@ import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.Assertions;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.parallel.ResourceLock;
 import org.mockito.ArgumentCaptor;
 import org.mockito.Mockito;
 import org.mockserver.integration.ClientAndServer;
@@ -54,6 +55,7 @@ import static org.mockserver.integration.ClientAndServer.startClientAndServer;
 import static org.mockserver.model.HttpRequest.request;
 import static org.mockserver.model.HttpResponse.response;
 
+@ResourceLock("SsrfProtectionValidator") // to avoid race conditions when modifying SsrfProtectionValidator's static configuration
 public class TbHttpClientTest {
 
     EventLoopGroup eventLoop;