diff --git a/Source/WebCore/platform/GStreamer.cmake b/Source/WebCore/platform/GStreamer.cmake
index 55f7c973771b..9d41485da55c 100644
--- a/Source/WebCore/platform/GStreamer.cmake
+++ b/Source/WebCore/platform/GStreamer.cmake
@@ -175,6 +175,13 @@ if (ENABLE_ENCRYPTED_MEDIA AND ENABLE_THUNDER)
     # Globally add thunder libraries, required for the check_cxx_symbol_exists call.
     set(CMAKE_REQUIRED_LIBRARIES ${THUNDER_LIBRARIES})
 
+    check_cxx_symbol_exists(opencdm_system_supported_robustness ${THUNDER_INCLUDE_DIR}/open_cdm.h HAS_OCDM_SUPPORTED_ROBUSTNESS)
+    if (HAS_OCDM_SUPPORTED_ROBUSTNESS)
+      list(APPEND WebCore_PRIVATE_DEFINITIONS THUNDER_HAS_OCDM_SUPPORTED_ROBUSTNESS=1)
+    else ()
+      list(APPEND WebCore_PRIVATE_DEFINITIONS THUNDER_HAS_OCDM_SUPPORTED_ROBUSTNESS=0)
+    endif ()
+
     check_cxx_symbol_exists(opencdm_gstreamer_session_decrypt_buffer ${THUNDER_INCLUDE_DIR}/open_cdm_adapter.h HAS_OCDM_DECRYPT_BUFFER)
     if (HAS_OCDM_DECRYPT_BUFFER)
       list(APPEND WebCore_PRIVATE_DEFINITIONS THUNDER_HAS_OCDM_DECRYPT_BUFFER=1)
diff --git a/Source/WebCore/platform/graphics/gstreamer/eme/CDMThunder.cpp b/Source/WebCore/platform/graphics/gstreamer/eme/CDMThunder.cpp
index dbe0195d802f..55a6a220a8ed 100644
--- a/Source/WebCore/platform/graphics/gstreamer/eme/CDMThunder.cpp
+++ b/Source/WebCore/platform/graphics/gstreamer/eme/CDMThunder.cpp
@@ -171,7 +171,39 @@ bool CDMPrivateThunder::supportsConfiguration(const CDMKeySystemConfiguration& c
 
 Vector<AtomString> CDMPrivateThunder::supportedRobustnesses() const
 {
-    return { emptyAtom(), "SW_SECURE_DECODE"_s, "SW_SECURE_CRYPTO"_s };
+    static const Vector<AtomString> defaultRobustnesses = { emptyAtom(), "SW_SECURE_DECODE"_s, "SW_SECURE_CRYPTO"_s };
+
+#if THUNDER_HAS_OCDM_SUPPORTED_ROBUSTNESS
+    if (!m_thunderSystem) {
+        GST_WARNING("CDMPrivateThunder: No active OpenCDM system. Falling back to default WebKit robustness levels.");
+        return defaultRobustnesses;
+    }
+
+    Vector<AtomString> robustnesses = { emptyAtom() };
+    char** buffer = nullptr;
+    uint16_t count = 0;
+
+    OpenCDMError error = opencdm_system_supported_robustness(m_thunderSystem.get(), &buffer, &count);
+    if (buffer) {
+        if (error == ERROR_NONE && count > 0)
+            robustnesses.reserveCapacity(robustnesses.size() + count);
+
+        for (uint16_t i = 0; i < count; ++i) {
+            if (error == ERROR_NONE && buffer[i])
+                robustnesses.append(AtomString::fromLatin1(buffer[i]));
+ 
+            free(buffer[i]);
+        }
+        free(buffer);
+    }
+
+    if (error == ERROR_NONE && robustnesses.size() > 1)
+        return robustnesses;
+
+    GST_WARNING("Failed to get robustness levels from OCDM.Falling back to default WebKit robustness levels.");
+#endif
+
+    return defaultRobustnesses;
 }
 
 CDMRequirement CDMPrivateThunder::distinctiveIdentifiersRequirement(const CDMKeySystemConfiguration&, const CDMRestrictions&) const