diff --git a/apps/theming/lib/ThemingDefaults.php b/apps/theming/lib/ThemingDefaults.php
index 445ab33e2563a..549820641dab1 100644
--- a/apps/theming/lib/ThemingDefaults.php
+++ b/apps/theming/lib/ThemingDefaults.php
@@ -68,27 +68,45 @@ public function __construct(
 		$this->docBaseUrl = parent::getDocBaseUrl();
 	}
 
-	public function getName() {
+	public function getName(): string {
+		if (parent::themeExist('getName')) {
+			return $this->name;
+		}
 		return strip_tags($this->appConfig->getAppValueString(ConfigLexicon::INSTANCE_NAME, $this->name));
 	}
 
-	public function getHTMLName() {
+	public function getHTMLName(): string {
+		if (parent::themeExist('getHTMLName')) {
+			return parent::getHTMLName();
+		}
 		return $this->appConfig->getAppValueString(ConfigLexicon::INSTANCE_NAME, $this->name);
 	}
 
-	public function getTitle() {
+	public function getTitle() : string {
+		if (parent::themeExist('getTitle')) {
+			return strip_tags($this->title);
+		}
 		return strip_tags($this->appConfig->getAppValueString(ConfigLexicon::INSTANCE_NAME, $this->title));
 	}
 
-	public function getEntity() {
+	public function getEntity() : string {
+		if (parent::themeExist('getEntity')) {
+			return $this->entity;
+		}
 		return strip_tags($this->appConfig->getAppValueString(ConfigLexicon::INSTANCE_NAME, $this->entity));
 	}
 
-	public function getProductName() {
+	public function getProductName() : string {
+		if (parent::themeExist("getProductName")) {
+			return strip_tags($this->productName);
+		}
 		return strip_tags($this->appConfig->getAppValueString(ConfigLexicon::PRODUCT_NAME, $this->productName));
 	}
 
-	public function getBaseUrl() {
+	public function getBaseUrl() : string {
+		if (parent::themeExist('getBaseUrl')) {
+			return $this->url;
+		}
 		return $this->appConfig->getAppValueString(ConfigLexicon::BASE_URL, $this->url);
 	}
 
@@ -97,19 +115,31 @@ public function getBaseUrl() {
 	 * @psalm-suppress InvalidReturnStatement
 	 * @psalm-suppress InvalidReturnType
 	 */
-	public function getSlogan(?string $lang = null): string {
+	public function getSlogan(?string $lang = null) : string {
+		if (parent::themeExist('getSlogan')) {
+			return \OCP\Util::sanitizeHTML(parent::getSlogan($lang));
+		}
 		return \OCP\Util::sanitizeHTML($this->appConfig->getAppValueString(ConfigLexicon::INSTANCE_SLOGAN, parent::getSlogan($lang)));
 	}
 
-	public function getImprintUrl(): string {
+	public function getImprintUrl() : string {
+		if (parent::themeExist('getImprintUrl')) {
+			return parent::getImprintUrl();
+		}
 		return $this->appConfig->getAppValueString(ConfigLexicon::INSTANCE_IMPRINT_URL, '');
 	}
 
-	public function getPrivacyUrl(): string {
+	public function getPrivacyUrl() : string {
+		if (parent::themeExist('getPrivacyUrl')) {
+			return parent::getPrivacyUrl();
+		}
 		return $this->appConfig->getAppValueString(ConfigLexicon::INSTANCE_PRIVACY_URL, '');
 	}
 
-	public function getDocBaseUrl(): string {
+	public function getDocBaseUrl() {
+		if (parent::themeExist('getDocBaseUrl')) {
+			return $this->docBaseUrl;
+		}
 		return $this->appConfig->getAppValueString(ConfigLexicon::DOC_BASE_URL, $this->docBaseUrl);
 	}
 
diff --git a/lib/private/legacy/OC_Defaults.php b/lib/private/legacy/OC_Defaults.php
index 0d460ff966d9c..160342dfa202a 100644
--- a/lib/private/legacy/OC_Defaults.php
+++ b/lib/private/legacy/OC_Defaults.php
@@ -65,7 +65,7 @@ public function __construct() {
 	/**
 	 * @param string $method
 	 */
-	private function themeExist($method) {
+	protected function themeExist($method) {
 		if (isset($this->theme) && method_exists($this->theme, $method)) {
 			return true;
 		}
@@ -332,4 +332,18 @@ public function getProductName() {
 		}
 		return $this->defaultProductName;
 	}
+
+	public function getImprintUrl() : string {
+		if ($this->themeExist('getImprintUrl')) {
+			return $this->theme->getImprintUrl();
+		}
+		return '';
+	}
+
+	public function getPrivacyUrl() : string {
+		if ($this->themeExist('getPrivacyUrl')) {
+			return $this->theme->getPrivacyUrl();
+		}
+		return '';
+	}
 }