diff --git a/services/nginx.nix b/services/nginx.nix
index c7c8847..cea9fad 100644
--- a/services/nginx.nix
+++ b/services/nginx.nix
@@ -32,6 +32,18 @@ let
     forceSSL = true;
   };
 
+  # Security headers, shared across every location. add_header does NOT
+  # merge with an ancestor context if a location defines its own add_header,
+  # so any location below that sets add_header must re-include this string.
+  securityHeaders = ''
+    add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;
+    add_header X-Frame-Options "SAMEORIGIN" always;
+    add_header X-Content-Type-Options "nosniff" always;
+    add_header Referrer-Policy "strict-origin-when-cross-origin" always;
+    add_header Permissions-Policy "camera=(), microphone=(), geolocation=()" always;
+    add_header Content-Security-Policy "default-src 'self' https: wss: data: blob: 'unsafe-inline' 'unsafe-eval'; frame-ancestors 'self';" always;
+  '';
+
   # Simple reverse proxy vhost
   proxy = port: ssl // {
     locations."/" = {
@@ -86,7 +98,7 @@ in
       appendHttpConfig = ''
         proxy_headers_hash_max_size 1024;
         access_log /var/log/nginx/access.log;
-      '';
+      '' + securityHeaders;
 
       virtualHosts = {
         # --- Unprotected (own auth, or by design) ---
@@ -104,7 +116,7 @@ in
         # auth.nordhammer.it, which trips the check. Strip it so qBit skips.
         # Cookie stripped too so cached SID cookies don't fight localhost-bypass.
         "torrent.nordhammer.it"  = lib.recursiveUpdate (protectedProxy 8080) {
-          locations."/".extraConfig = autheliaAuthConfig + ''
+          locations."/".extraConfig = autheliaAuthConfig + securityHeaders + ''
             proxy_set_header Referer "";
             proxy_set_header Cookie "";
             proxy_hide_header Set-Cookie;
@@ -118,7 +130,7 @@ in
         "shelfarr.nordhammer.it" = protectedProxy 5056;
         "sabnzbd.nordhammer.it"  = protectedProxy 8085;
         "code.nordhammer.it"     = lib.recursiveUpdate (protectedProxy 4444) {
-          locations."/".extraConfig = autheliaAuthConfig + ''
+          locations."/".extraConfig = autheliaAuthConfig + securityHeaders + ''
             # Prevent browser from restoring a cached page on tab reopen —
             # forces a fresh request so Authelia can redirect before JS
             # tries to open a WebSocket with an expired session.