diff --git a/src/main/java/cc/pulseapp/api/config/WebSecurityConfig.java b/src/main/java/cc/pulseapp/api/config/WebSecurityConfig.java
new file mode 100644
index 0000000..b2e21f8
--- /dev/null
+++ b/src/main/java/cc/pulseapp/api/config/WebSecurityConfig.java
@@ -0,0 +1,96 @@
+package cc.pulseapp.api.config;
+
+import cc.pulseapp.api.model.IGenericResponse;
+import cc.pulseapp.api.model.user.Session;
+import cc.pulseapp.api.repository.SessionRepository;
+import jakarta.servlet.http.HttpServletRequest;
+import lombok.NonNull;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.core.Ordered;
+import org.springframework.core.annotation.Order;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.HttpStatus;
+import org.springframework.security.authentication.BadCredentialsException;
+import org.springframework.security.config.annotation.web.builders.HttpSecurity;
+import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
+import org.springframework.security.config.annotation.web.configurers.AbstractHttpConfigurer;
+import org.springframework.security.config.http.SessionCreationPolicy;
+import org.springframework.security.web.SecurityFilterChain;
+import org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter;
+import org.springframework.security.web.authentication.preauth.AbstractPreAuthenticatedProcessingFilter;
+import org.springframework.security.web.util.matcher.AntPathRequestMatcher;
+
+/**
+ * @author Braydon
+ */
+@Configuration
+@EnableWebSecurity
+@Order(Ordered.HIGHEST_PRECEDENCE)
+public class WebSecurityConfig {
+    /**
+     * The session repository to use.
+     */
+    @NonNull private final SessionRepository sessionRepository;
+
+    @Autowired
+    public WebSecurityConfig(@NonNull SessionRepository sessionRepository) {
+        this.sessionRepository = sessionRepository;
+    }
+
+    @Bean @NonNull
+    public SecurityFilterChain filterChain(@NonNull HttpSecurity http) throws Exception {
+        SessionFilter filter = new SessionFilter();
+        filter.setAuthenticationManager(authentication -> {
+            Session authToken = (Session) authentication.getCredentials();
+            if (authToken == null) { // No API key found
+                throw new BadCredentialsException(Error.INVALID_ACCESS_TOKEN.name());
+            }
+            authentication.setAuthenticated(true); // Mark the session as authenticated
+            return authentication;
+        });
+        return http.csrf(AbstractHttpConfigurer::disable) // Disable CSRF
+                .sessionManagement(sessionManagement -> sessionManagement.sessionCreationPolicy(SessionCreationPolicy.STATELESS)) // No sessions
+                .formLogin(AbstractHttpConfigurer::disable) // Disable form logins
+                .securityMatcher("/**") // Require auth for all routes
+                .addFilterBefore(filter, UsernamePasswordAuthenticationFilter.class) // Add the auth token filter
+                .authorizeHttpRequests(registry -> registry // Except for the following routes
+                        .requestMatchers(AntPathRequestMatcher.antMatcher("/")).permitAll()
+                        .requestMatchers(AntPathRequestMatcher.antMatcher("/error")).permitAll()
+                        .requestMatchers(AntPathRequestMatcher.antMatcher("/v*/auth/register")).permitAll()
+                        .requestMatchers(AntPathRequestMatcher.antMatcher("/v*/auth/login")).permitAll()
+                        .anyRequest().authenticated())
+                .exceptionHandling(exceptionHandling -> exceptionHandling
+                        .authenticationEntryPoint((request, response, authException) -> { // Handle invalid access tokens
+                            response.sendError(HttpStatus.FORBIDDEN.value(), Error.INVALID_ACCESS_TOKEN.name());
+                        }))
+                .build();
+    }
+
+    private enum Error implements IGenericResponse {
+        INVALID_ACCESS_TOKEN
+    }
+
+    /**
+     * The filter for authenticating
+     * requests with an {@link Session}.
+     *
+     * @author Braydon
+     */
+    public final class SessionFilter extends AbstractPreAuthenticatedProcessingFilter {
+        @Override
+        protected String getPreAuthenticatedPrincipal(@NonNull HttpServletRequest request) {
+            return request.getHeader(HttpHeaders.AUTHORIZATION);
+        }
+
+        @Override
+        protected Session getPreAuthenticatedCredentials(@NonNull HttpServletRequest request) {
+            String accessToken = getPreAuthenticatedPrincipal(request); // Get the provided access token
+            if (accessToken == null || !accessToken.startsWith("Bearer ")) {
+                return null;
+            }
+            return sessionRepository.findByAccessToken(accessToken.substring(7));
+        }
+    }
+}
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