diff --git a/.github/workflows/functionaltests.yml b/.github/workflows/functionaltests.yml
index abb7534..63ec05b 100644
--- a/.github/workflows/functionaltests.yml
+++ b/.github/workflows/functionaltests.yml
@@ -30,32 +30,35 @@ jobs:
           extensions: mbstring, xml, json, zlib, iconv, intl, pdo_sqlite
           ini-values: opcache.fast_shutdown=0
 
-      - name: "[1/5] Create composer project - Cache composer dependencies"
-        uses: actions/cache@v1
-        with:
-          path: ~/.composer/cache
-          key: php-${{ matrix.php-version }}-flow-${{ matrix.flow-version }}-composer-${{ hashFiles('composer.json') }}
-          restore-keys: |
-            php-${{ matrix.php-version }}-flow-${{ matrix.flow-version }}-composer-
-            php-${{ matrix.php-version }}-flow-
-
-      - name: "[2/5] Create composer project - No install"
+      - name: "Create composer project - No install"
         run: composer create-project neos/flow-base-distribution ${{ env.FLOW_DIST_FOLDER }} --prefer-dist --no-progress --no-install "^${{ matrix.flow-version }}"
 
-      - name: "[3/5] Allow neos composer plugin"
+      - name: "Allow neos composer plugin"
         run: composer config --no-plugins allow-plugins.neos/composer-plugin true
         working-directory: ${{ env.FLOW_DIST_FOLDER }}
 
-      - name: "[4/5] Create composer project  - Require behat in compatible version"
+      - name: "Create composer project  - Require behat in compatible version"
         run: composer require --dev --no-update "neos/behat:@dev"
         working-directory: ${{ env.FLOW_DIST_FOLDER }}
 
-      - name: "[5/5] Create composer project - Install project"
+      - name: Get composer cache directory
+        id: composer-cache
+        run: echo "dir=$(composer config cache-files-dir)" >> $GITHUB_OUTPUT
+        working-directory: ${{ env.FLOW_DIST_FOLDER }}
+
+      - name: Cache dependencies
+        uses: actions/cache@v4
+        with:
+          path: ${{ steps.composer-cache.outputs.dir }}
+          key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.json') }}
+          restore-keys: ${{ runner.os }}-composer-
+
+      - name: "Create composer project - Install project"
         run: composer install
         working-directory: ${{ env.FLOW_DIST_FOLDER }}
 
       - name: Checkout code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
         with:
           path: ${{ env.FLOW_DIST_FOLDER }}/DistributionPackages/Netlogix.Sentry
 
diff --git a/.github/workflows/unittests.yml b/.github/workflows/unittests.yml
index 8fd5c0e..750b4b1 100644
--- a/.github/workflows/unittests.yml
+++ b/.github/workflows/unittests.yml
@@ -30,32 +30,35 @@ jobs:
           extensions: mbstring, xml, json, zlib, iconv, intl, pdo_sqlite
           ini-values: opcache.fast_shutdown=0
 
-      - name: "[1/5] Create composer project - Cache composer dependencies"
-        uses: actions/cache@v1
-        with:
-          path: ~/.composer/cache
-          key: php-${{ matrix.php-version }}-flow-${{ matrix.flow-version }}-composer-${{ hashFiles('composer.json') }}
-          restore-keys: |
-            php-${{ matrix.php-version }}-flow-${{ matrix.flow-version }}-composer-
-            php-${{ matrix.php-version }}-flow-
-
-      - name: "[2/5] Create composer project - No install"
+      - name: "Create composer project - No install"
         run: composer create-project neos/flow-base-distribution ${{ env.FLOW_DIST_FOLDER }} --prefer-dist --no-progress --no-install "^${{ matrix.flow-version }}"
 
-      - name: "[3/5] Allow neos composer plugin"
+      - name: "Allow neos composer plugin"
         run: composer config --no-plugins allow-plugins.neos/composer-plugin true
         working-directory: ${{ env.FLOW_DIST_FOLDER }}
 
-      - name: "[4/5] Create composer project  - Require behat in compatible version"
+      - name: "Create composer project  - Require behat in compatible version"
         run: composer require --dev --no-update "neos/behat:@dev"
         working-directory: ${{ env.FLOW_DIST_FOLDER }}
 
-      - name: "[5/5] Create composer project - Install project"
+      - name: Get composer cache directory
+        id: composer-cache
+        run: echo "dir=$(composer config cache-files-dir)" >> $GITHUB_OUTPUT
+        working-directory: ${{ env.FLOW_DIST_FOLDER }}
+
+      - name: Cache dependencies
+        uses: actions/cache@v4
+        with:
+          path: ${{ steps.composer-cache.outputs.dir }}
+          key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.json') }}
+          restore-keys: ${{ runner.os }}-composer-
+
+      - name: "Create composer project - Install project"
         run: composer install
         working-directory: ${{ env.FLOW_DIST_FOLDER }}
 
       - name: Checkout code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
         with:
           path: ${{ env.FLOW_DIST_FOLDER }}/DistributionPackages/Netlogix.Sentry
 
diff --git a/Classes/ContentSecurityPolicy/ContentSecurityPolicyMiddleware.php b/Classes/ContentSecurityPolicy/ContentSecurityPolicyMiddleware.php
new file mode 100644
index 0000000..0a9a934
--- /dev/null
+++ b/Classes/ContentSecurityPolicy/ContentSecurityPolicyMiddleware.php
@@ -0,0 +1,133 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Netlogix\Sentry\ContentSecurityPolicy;
+
+use GuzzleHttp\Psr7\Uri;
+use Neos\Flow\Annotations as Flow;
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\ServerRequestInterface;
+use Psr\Http\Message\UriInterface;
+use Psr\Http\Server\MiddlewareInterface;
+use Psr\Http\Server\RequestHandlerInterface;
+
+class ContentSecurityPolicyMiddleware implements MiddlewareInterface
+{
+    #[Flow\InjectConfiguration(path: 'csp.enable')]
+    protected bool $enabled = true;
+
+    #[Flow\InjectConfiguration(path: 'csp.headers.reportOnly')]
+    protected bool $reportOnly = true;
+
+    #[Flow\InjectConfiguration(path: 'csp.headers.blacklistedPaths')]
+    protected array $blacklistedPaths = [];
+
+    #[Flow\InjectConfiguration(path: 'csp.headers.parts')]
+    protected array $parts = [];
+
+    #[Flow\Inject]
+    protected Registry $registry;
+
+    public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface
+    {
+        $response = $handler->handle($request);
+
+        if (!$this->enabled) {
+            return $response;
+        }
+        if ($this->parts === [] || $this->isUriInBlocklist($request->getUri())) {
+            return $response;
+        }
+
+        $response = $this->addReportingEndpoints($request, $response);
+        $response = $this->addContentSecurityPolicy($request, $response);
+
+        return $response;
+    }
+
+    protected function addContentSecurityPolicy(
+        ServerRequestInterface $request,
+        ResponseInterface $response
+    ): ResponseInterface {
+        if ($this->reportOnly) {
+            $headerName = 'Content-Security-Policy-Report-Only';
+        } else {
+            $headerName = 'Content-Security-Policy';
+        }
+
+        $parts = $this->parts;
+        if ($this->registry->getSafeInlineScriptHashes() !== []) {
+            $safeInlineScripts = join(
+                ' ',
+                array_map(fn (string $hash) => sprintf("'%s'", $hash), $this->registry->getSafeInlineScriptHashes())
+            );
+            $existingScriptSrc = array_find_key($parts, fn (string $part) => str_starts_with($part, 'script-src'));
+
+            if ($existingScriptSrc !== null) {
+                $parts[$existingScriptSrc] = $parts[$existingScriptSrc] . ' ' . $safeInlineScripts;
+            } else {
+                $parts[] = 'script-src ' . $safeInlineScripts;
+            }
+        }
+
+        $defaultParts = [
+            'report-uri ' . $this->reportingEndpoint($request),
+            'report-to csp-endpoint'
+        ];
+
+        $parts = array_merge($parts, $defaultParts);
+
+        return $response
+            ->withHeader($headerName, trim(join('; ', $parts), "; \n\r\t\v\0"));
+    }
+
+    protected function addReportingEndpoints(
+        ServerRequestInterface $request,
+        ResponseInterface $response
+    ): ResponseInterface {
+        $reportingEndpoints = [
+            'csp-endpoint' => $this->reportingEndpoint($request),
+        ];
+
+        $headerValues = array_reduce(array_keys($reportingEndpoints),
+            function (array $carry, string $key) use ($reportingEndpoints) {
+                $carry[$key] = sprintf('%s="%s"', $key, $reportingEndpoints[$key]);
+
+                return $carry;
+            }, []);
+
+        return $response
+            ->withHeader('Reporting-Endpoints', join(', ', $headerValues));
+    }
+
+    protected function reportingEndpoint(ServerRequestInterface $request): string
+    {
+        $uri = $request->getUri();
+
+        return Uri::composeComponents(
+            $uri->getScheme(),
+            $uri->getHost(),
+            'api/csp-report',
+            '',
+            ''
+        );
+    }
+
+    public function isUriInBlocklist(UriInterface $uri): bool
+    {
+        $path = $uri->getPath();
+        foreach ($this->blacklistedPaths as $rawPattern => $active) {
+            if (!$active) {
+                continue;
+            }
+            $pattern = '/' . str_replace('/', '\/', $rawPattern) . '/';
+
+            if (preg_match($pattern, $path) === 1) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+}
diff --git a/Classes/ContentSecurityPolicy/Registry.php b/Classes/ContentSecurityPolicy/Registry.php
new file mode 100644
index 0000000..292530c
--- /dev/null
+++ b/Classes/ContentSecurityPolicy/Registry.php
@@ -0,0 +1,42 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Netlogix\Sentry\ContentSecurityPolicy;
+
+use Neos\Eel\ProtectedContextAwareInterface;
+use Neos\Flow\Annotations as Flow;
+
+/**
+ * @Flow\Scope("singleton")
+ */
+#[Flow\Scope('singleton')]
+class Registry implements ProtectedContextAwareInterface
+{
+    protected static array $safeInlineScriptHashes = [];
+
+    /**
+     * Registers a safe inline script from the provided source.
+     *
+     * @param string $script The script content that needs to be registered as a safe inline script.
+     * @param string $algorithm The algorithm to use for hashing the script content (default: sha256)
+     * @return string The trimmed script content is returned
+     */
+    public function registerSafeInlineScriptFromSource(string $script, string $algorithm = 'sha256'): string
+    {
+        $hash = base64_encode(hash($algorithm, $script, true));
+        self::$safeInlineScriptHashes[] = sprintf('%s-%s', $algorithm, $hash);
+
+        return $script;
+    }
+
+    public function getSafeInlineScriptHashes(): array
+    {
+        return self::$safeInlineScriptHashes;
+    }
+
+    public function allowsCallOfMethod($methodName): bool
+    {
+        return true;
+    }
+}
diff --git a/Classes/Controller/ContentSecurityPolicyController.php b/Classes/Controller/ContentSecurityPolicyController.php
new file mode 100644
index 0000000..9b86e72
--- /dev/null
+++ b/Classes/Controller/ContentSecurityPolicyController.php
@@ -0,0 +1,75 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Netlogix\Sentry\Controller;
+
+use Neos\Flow\Log\ThrowableStorageInterface;
+use Neos\Flow\Mvc\Controller\ActionController;
+use Neos\Flow\Annotations as Flow;
+use Psr\Http\Client\ClientExceptionInterface;
+use Psr\Http\Client\ClientInterface;
+use Psr\Http\Message\RequestFactoryInterface;
+use Psr\Http\Message\StreamFactoryInterface;
+use Sentry\SentrySdk;
+
+class ContentSecurityPolicyController extends ActionController
+{
+    protected $supportedMediaTypes = ['application/csp-report'];
+
+    #[Flow\InjectConfiguration(path: 'csp.enable')]
+    protected bool $enabled = true;
+
+    #[Flow\InjectConfiguration(path: 'csp.reports.includedHeaders')]
+    protected array $includedHeaders = [];
+
+    #[Flow\Inject]
+    protected ThrowableStorageInterface $throwableStorage;
+
+    public function indexAction(): string
+    {
+        if (!$this->enabled) {
+            return '';
+        }
+
+        $reportingEndpoint = $this->getSentryReportingEndpoint();
+        if ($reportingEndpoint === null) {
+            return '';
+        }
+
+        // TODO: Only report a limited amount to avoid filling up sentry
+
+        $body = $this->request->getHttpRequest()->getBody();
+        $body->rewind();
+        $postBody = $body->getContents();
+
+        $client = $this->objectManager->get(ClientInterface::class);
+        $requestFactory = $this->objectManager->get(RequestFactoryInterface::class);
+        $streamFactory = $this->objectManager->get(StreamFactoryInterface::class);
+        $request = $requestFactory->createRequest('POST', $reportingEndpoint)
+            ->withBody($streamFactory->createStream($postBody));
+
+        foreach (array_keys(array_filter($this->includedHeaders)) as $header) {
+            $headerValue = $this->request->getHttpRequest()->getHeaderLine($header);
+            if ($headerValue === '') {
+                continue;
+            }
+
+            $request = $request
+                ->withHeader($header, $headerValue);
+        }
+
+        try {
+            $client->sendRequest($request);
+        } catch (ClientExceptionInterface $e) {
+            $this->throwableStorage->logThrowable($e);
+        }
+
+        return '';
+    }
+
+    protected function getSentryReportingEndpoint(): ?string
+    {
+        return SentrySdk::getCurrentHub()->getClient()?->getCspReportUrl();
+    }
+}
diff --git a/Classes/Package.php b/Classes/Package.php
index 23f21c3..2c82a38 100644
--- a/Classes/Package.php
+++ b/Classes/Package.php
@@ -28,7 +28,7 @@ static function (ConfigurationManager $configurationManager) {
                     ConfigurationManager::CONFIGURATION_TYPE_SETTINGS,
                     'Netlogix.Sentry.inAppExclude'
                 );
-                
+
                 init([
                     'dsn' => $dsn,
                     'integrations' => [
diff --git a/Configuration/Policy.yaml b/Configuration/Policy.yaml
index 713f85f..520b36a 100644
--- a/Configuration/Policy.yaml
+++ b/Configuration/Policy.yaml
@@ -5,6 +5,9 @@ privilegeTargets:
     'Netlogix.Sentry:Backend.EncryptedPayload':
       matcher: 'method(Netlogix\Sentry\Controller\EncryptedPayloadController->.*())'
 
+    'Netlogix.Sentry:Public.ContentSecurityPolicy':
+      matcher: 'method(Netlogix\Sentry\Controller\ContentSecurityPolicyController->.*())'
+
 roles:
 
   'Neos.Flow:Anonymous':
@@ -12,6 +15,9 @@ roles:
       -
         privilegeTarget: 'Netlogix.Sentry:Backend.EncryptedPayload'
         permission: DENY
+      -
+        privilegeTarget: 'Netlogix.Sentry:Public.ContentSecurityPolicy'
+        permission: GRANT
 
   'Neos.Neos:Administrator':
     privileges:
diff --git a/Configuration/Routes.yaml b/Configuration/Routes.yaml
index ecd4b6a..d208218 100644
--- a/Configuration/Routes.yaml
+++ b/Configuration/Routes.yaml
@@ -5,5 +5,15 @@
     '@controller': 'EncryptedPayload'
     '@action':     'decrypt'
     '@format':     'html'
-  appendExceedingArguments: TRUE
+  appendExceedingArguments: true
   httpMethods: ['GET']
+
+- name: 'Content Security Policy'
+  uriPattern: 'api/csp-report'
+  defaults:
+    '@package':    'Netlogix.Sentry'
+    '@controller': 'ContentSecurityPolicy'
+    '@action':     'index'
+    '@format':     'json'
+  appendExceedingArguments: true
+  httpMethods: ['POST']
diff --git a/Configuration/Settings.Csp.yaml b/Configuration/Settings.Csp.yaml
new file mode 100644
index 0000000..c6cb4f1
--- /dev/null
+++ b/Configuration/Settings.Csp.yaml
@@ -0,0 +1,28 @@
+Netlogix:
+  Sentry:
+    csp:
+      # Enable Content-Security-Policy features (csp header & proxying to sentry)
+      enable: false
+
+      headers:
+        # Whether to use the Content-Security-Policy-Report-Only instead of the Content-Security-Policy header
+        reportOnly: true
+
+        # Regular expressions for paths where no csp headers should be set
+        blacklistedPaths:
+          '/neos.*': true
+
+        # List of csp header values to include. No need to specify report-uri or report-to as that is handled automatically
+        parts: []
+        #  parts:
+        #    - "default-src *"
+        #    - "script-src 'self' 'unsafe-eval' 'unsafe-inline'"
+        #    - "style-src 'self' 'unsafe-inline'"
+        #    - "img-src * data:"
+
+      reports:
+        # List of headers to include when proxying the client request to sentry
+        includedHeaders:
+          'Referer': true
+          'User-Agent': true
+          'Content-Type': true
diff --git a/Configuration/Settings.Eel.yaml b/Configuration/Settings.Eel.yaml
new file mode 100644
index 0000000..eb5055a
--- /dev/null
+++ b/Configuration/Settings.Eel.yaml
@@ -0,0 +1,5 @@
+Neos:
+  # Fusion might not be installed, but adding the Registry to the defaultContext won't hurt
+  Fusion:
+    defaultContext:
+      'Netlogix.CspRegistry': 'Netlogix\Sentry\ContentSecurityPolicy\Registry'
diff --git a/Configuration/Settings.Middleware.yaml b/Configuration/Settings.Middleware.yaml
new file mode 100644
index 0000000..22a7600
--- /dev/null
+++ b/Configuration/Settings.Middleware.yaml
@@ -0,0 +1,7 @@
+Neos:
+  Flow:
+    http:
+      middlewares:
+        'nlxSentryContentSecurityPolicy':
+          position: 'before dispatch'
+          middleware: 'Netlogix\Sentry\ContentSecurityPolicy\ContentSecurityPolicyMiddleware'
diff --git a/composer.json b/composer.json
index 9524425..426397f 100644
--- a/composer.json
+++ b/composer.json
@@ -7,6 +7,8 @@
         "php": "^8.0",
         "neos/flow": "^7.3.6 || ^8.0.4 || ~9.0.0",
         "sentry/sdk": "^3.1",
+        "psr/http-client": "^1.0",
+        "psr/http-factory": "^1.0",
         "ext-openssl": "*",
         "ext-json": "*"
     },