diff --git a/pom.xml b/pom.xml
index 1634a092..bd119487 100644
--- a/pom.xml
+++ b/pom.xml
@@ -324,6 +324,13 @@
             <artifactId>s3</artifactId>
         </dependency>
 
+        <!-- Java native HTTP client extensions -->
+        <dependency>
+            <groupId>com.github.mizosoft.methanol</groupId>
+            <artifactId>methanol</artifactId>
+            <version>1.7.0</version>
+        </dependency>
+
         <!-- Test-->
 
         <dependency>
diff --git a/src/ext/java/no/entur/uttu/ext/fintraffic/security/FintrafficSecurityConfiguration.java b/src/ext/java/no/entur/uttu/ext/fintraffic/security/FintrafficSecurityConfiguration.java
new file mode 100644
index 00000000..28180011
--- /dev/null
+++ b/src/ext/java/no/entur/uttu/ext/fintraffic/security/FintrafficSecurityConfiguration.java
@@ -0,0 +1,31 @@
+package no.entur.uttu.ext.fintraffic.security;
+
+import no.entur.uttu.security.spi.UserContextService;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Profile;
+
+@Configuration
+@Profile("fintraffic")
+public class FintrafficSecurityConfiguration {
+
+  @Bean
+  UserContextService userContextService(
+    @Value("${uttu.ext.fintraffic.security.tenant-id}") String tenantId,
+    @Value("${uttu.ext.fintraffic.security.client-id}") String clientId,
+    @Value("${uttu.ext.fintraffic.security.client-secret}") String clientSecret,
+    @Value("${uttu.ext.fintraffic.security.scope}") String scope,
+    @Value("${uttu.ext.fintraffic.security.admin-role-id}") String adminRoleId,
+    @Value("${uttu.ext.fintraffic.security.vaco-api}") String vacoApi
+  ) {
+    return new FintrafficUserContextService(
+      tenantId,
+      clientId,
+      clientSecret,
+      scope,
+      adminRoleId,
+      vacoApi
+    );
+  }
+}
diff --git a/src/ext/java/no/entur/uttu/ext/fintraffic/security/FintrafficUserContextService.java b/src/ext/java/no/entur/uttu/ext/fintraffic/security/FintrafficUserContextService.java
new file mode 100644
index 00000000..57f26540
--- /dev/null
+++ b/src/ext/java/no/entur/uttu/ext/fintraffic/security/FintrafficUserContextService.java
@@ -0,0 +1,313 @@
+package no.entur.uttu.ext.fintraffic.security;
+
+import com.fasterxml.jackson.core.type.TypeReference;
+import com.fasterxml.jackson.databind.DeserializationFeature;
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.github.mizosoft.methanol.FormBodyPublisher;
+import com.github.mizosoft.methanol.Methanol;
+import com.github.mizosoft.methanol.MutableRequest;
+import java.io.IOException;
+import java.net.http.HttpClient;
+import java.net.http.HttpResponse;
+import java.net.http.HttpResponse.BodyHandlers;
+import java.time.Duration;
+import java.time.LocalDate;
+import java.time.LocalDateTime;
+import java.time.format.DateTimeFormatter;
+import java.util.Optional;
+import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ConcurrentMap;
+import java.util.concurrent.atomic.AtomicReference;
+import java.util.stream.Collectors;
+import no.entur.uttu.ext.fintraffic.security.model.EntraTokenResponse;
+import no.entur.uttu.ext.fintraffic.security.model.Me;
+import no.entur.uttu.ext.fintraffic.security.model.VacoApiResponse;
+import no.entur.uttu.security.spi.UserContextService;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.security.core.context.SecurityContextHolder;
+import org.springframework.security.oauth2.jwt.Jwt;
+import org.springframework.security.oauth2.server.resource.authentication.JwtAuthenticationToken;
+
+/**
+ * Fintraffic uses a combination of <a href="https://learn.microsoft.com/en-us/entra/">Entra</a>, <a href="https://learn.microsoft.com/en-us/graph/overview">Microsoft Graph</a>
+ * and in-house TIS VACO service specific data to determine user's access to various resources.
+ */
+public class FintrafficUserContextService implements UserContextService {
+
+  private static final Logger logger = LoggerFactory.getLogger(
+    FintrafficUserContextService.class
+  );
+
+  /**
+   * Microsoft Graph authentication scope requires this as its hardcoded value.
+   */
+  private static final String MICROSOFT_GRAPH_SCOPE =
+    "https://graph.microsoft.com/.default";
+  /**
+   * Microsoft Graph API root URI.
+   *
+   * @see <a href="https://learn.microsoft.com/en-us/graph/api/overview?view=graph-rest-1.0">Microsoft Graph REST API v1.0 endpoint reference</a>
+   */
+  private static final String MICROSOFT_GRAPH_API_ROOT =
+    "https://graph.microsoft.com/v1.0";
+
+  /**
+   * Generic Microsoft Entra login URI, provided as template. Call <code>"...".format(tenantId)</code> to acquire
+   * working login URI.
+   *
+   * @see <a href="https://learn.microsoft.com/en-us/entra/">Microsoft Entra</a>
+   */
+  private static final String MICROSOFT_ENTRA_LOGIN_URI =
+    "https://login.microsoftonline.com/%s/oauth2/v2.0/token";
+
+  /**
+   * Entra tenant id for accessing any Entra or Graph protected resource within the represented tenant.
+   *
+   * @see #MICROSOFT_ENTRA_LOGIN_URI
+   */
+  private final String tenantId;
+
+  /**
+   * Entra client id for accessing Fintraffic TIS VACO API.
+   */
+  private final String clientId;
+
+  /**
+   * Entra client secret for accessing Fintraffic TIS VACO API.
+   */
+  private final String clientSecret;
+
+  /**
+   * Authentication scope for accessing Fintraffic TIS VACO API.
+   */
+  private final String scope;
+
+  /**
+   * Microsoft Entra application role's id for admin identifying users.
+   */
+  private final String adminRoleId;
+
+  /**
+   * Fintraffic TIS VACO service's API root URI.
+   */
+  private final String vacoApi;
+
+  /**
+   * Stores authentication scope to {@link EntraTokenResponse} for reusing authentication tokens.
+   */
+  private final ConcurrentMap<String, AtomicReference<EntraTokenResponse>> authenticationTokens =
+    new ConcurrentHashMap<>();
+
+  private final Methanol httpClient;
+
+  /**
+   * Internal {@link ObjectMapper} used for VACO API interactions, isolated from Spring's singleton on purpose to avoid
+   * accidental misconfigurations.
+   */
+  private final ObjectMapper objectMapper;
+
+  public FintrafficUserContextService(
+    String tenantId,
+    String clientId,
+    String clientSecret,
+    String scope,
+    String adminRoleId,
+    String vacoApi
+  ) {
+    this.tenantId = tenantId;
+    this.clientId = clientId;
+    this.clientSecret = clientSecret;
+    this.scope = scope;
+    this.adminRoleId = adminRoleId;
+    this.vacoApi = vacoApi;
+    this.objectMapper = initializeObjectMapper();
+    this.httpClient = initializeHttpClient();
+  }
+
+  private static ObjectMapper initializeObjectMapper() {
+    ObjectMapper om = new ObjectMapper();
+    om.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
+    return om;
+  }
+
+  private static Methanol initializeHttpClient() {
+    return Methanol
+      .newBuilder()
+      .connectTimeout(Duration.ofSeconds(5))
+      .requestTimeout(Duration.ofSeconds(5))
+      .headersTimeout(Duration.ofSeconds(5))
+      .readTimeout(Duration.ofSeconds(5))
+      .followRedirects(HttpClient.Redirect.NORMAL)
+      .userAgent("Entur Uttu/" + LocalDate.now().format(DateTimeFormatter.ISO_DATE))
+      .build();
+  }
+
+  /**
+   * {@inheritDoc}
+   *
+   * @return User's preferred name defined by the <code>preferred_username</code> claim provided by Entra.
+   */
+  @Override
+  public String getPreferredName() {
+    return getToken()
+      .map(t -> t.getClaimAsString("preferred_username"))
+      .orElse("unknown");
+  }
+
+  private static Optional<Jwt> getToken() {
+    if (
+      SecurityContextHolder
+        .getContext()
+        .getAuthentication() instanceof JwtAuthenticationToken token &&
+      (token.getPrincipal() instanceof Jwt jwt)
+    ) {
+      return Optional.of(jwt);
+    }
+    return Optional.empty();
+  }
+
+  @Override
+  public boolean isAdmin() {
+    return login(MICROSOFT_GRAPH_SCOPE)
+      .flatMap(this::msGraphAppRoleAssignments)
+      .map(tree -> {
+        JsonNode assignedAppRoles = tree.path("value");
+        if (assignedAppRoles.isArray()) {
+          for (JsonNode assignedAppRole : assignedAppRoles) {
+            if (
+              assignedAppRole.has("appRoleId") &&
+              assignedAppRole.get("appRoleId").asText().equals(adminRoleId)
+            ) {
+              return true;
+            }
+          }
+        }
+        return false;
+      })
+      .orElse(false);
+  }
+
+  /**
+   * Hand-rolled implementation of acquiring app role assignments from MS Graph to avoid unnecessarily high amount of
+   * dependencies.
+   *
+   * @param serviceToken Token authorized to access {@link #MICROSOFT_GRAPH_SCOPE}
+   * @return Jackson {@link JsonNode} representing successful response from MS Graph or {@link Optional#empty()} if call failed.
+   * @see #login(String)
+   */
+  private Optional<JsonNode> msGraphAppRoleAssignments(EntraTokenResponse serviceToken) {
+    return getToken()
+      .flatMap(jwt -> {
+        MutableRequest request = MutableRequest
+          .GET(
+            MICROSOFT_GRAPH_API_ROOT +
+            "/users/" +
+            jwt.getClaimAsString("oid") +
+            "/appRoleAssignments"
+          )
+          .header("Authorization", "Bearer " + serviceToken.getAccessToken())
+          .header("Content-Type", "application/json");
+        try {
+          HttpResponse<String> response = httpClient.send(
+            request,
+            BodyHandlers.ofString()
+          );
+          JsonNode tree = objectMapper.readTree(response.body());
+          return Optional.of(tree);
+        } catch (IOException e) {
+          logger.warn("I/O error during API request", e);
+        } catch (InterruptedException e) {
+          logger.warn(
+            "Underlying thread interrupted during HTTP client action, interrupting current thread",
+            e
+          );
+          Thread.currentThread().interrupt();
+        }
+        return Optional.empty();
+      });
+  }
+
+  @Override
+  public boolean hasAccessToProvider(String providerCode) {
+    return login(scope)
+      .flatMap(this::me)
+      .map(me -> {
+        Set<String> things = me
+          .data()
+          .companies()
+          .stream()
+          .flatMap(vc -> vc.codespaces().stream())
+          .collect(Collectors.toSet());
+        return things.contains(providerCode);
+      })
+      .orElse(false);
+  }
+
+  private Optional<EntraTokenResponse> login(String tokenScope) {
+    AtomicReference<EntraTokenResponse> tokenContainer =
+      authenticationTokens.computeIfAbsent(tokenScope, t -> new AtomicReference<>(null));
+    EntraTokenResponse currentToken = tokenContainer.get();
+    if (
+      currentToken == null ||
+      currentToken.getValidUntil().isBefore(LocalDateTime.now().minusSeconds(10))
+    ) {
+      try {
+        FormBodyPublisher formBody = FormBodyPublisher
+          .newBuilder()
+          .query("client_id", clientId)
+          .query("grant_type", "client_credentials")
+          .query("scope", tokenScope)
+          .query("client_secret", clientSecret)
+          .build();
+        MutableRequest request = MutableRequest.POST(
+          MICROSOFT_ENTRA_LOGIN_URI.formatted(tenantId),
+          formBody
+        );
+        HttpResponse<String> response = httpClient.send(request, BodyHandlers.ofString());
+
+        EntraTokenResponse newToken = objectMapper.readValue(
+          response.body(),
+          EntraTokenResponse.class
+        );
+        tokenContainer.compareAndSet(currentToken, newToken);
+      } catch (IOException e) {
+        logger.warn("I/O error during API request", e);
+      } catch (InterruptedException e) {
+        logger.warn(
+          "Underlying thread interrupted during HTTP client action, interrupting current thread",
+          e
+        );
+        Thread.currentThread().interrupt();
+      }
+    }
+    return Optional.ofNullable(tokenContainer.get());
+  }
+
+  private Optional<VacoApiResponse<Me>> me(EntraTokenResponse token) {
+    MutableRequest request = MutableRequest
+      .GET(vacoApi + "/me")
+      .header("Authorization", "Bearer " + token.getAccessToken())
+      .header("Content-Type", "application/json");
+    try {
+      HttpResponse<String> response = httpClient.send(request, BodyHandlers.ofString());
+      return Optional.of(
+        objectMapper.readValue(
+          response.body(),
+          new TypeReference<VacoApiResponse<Me>>() {}
+        )
+      );
+    } catch (IOException e) {
+      logger.warn("I/O error during API request", e);
+    } catch (InterruptedException e) {
+      logger.warn(
+        "Underlying thread interrupted during HTTP client action, interrupting current thread",
+        e
+      );
+      Thread.currentThread().interrupt();
+    }
+    return Optional.empty();
+  }
+}
diff --git a/src/ext/java/no/entur/uttu/ext/fintraffic/security/HttpClientException.java b/src/ext/java/no/entur/uttu/ext/fintraffic/security/HttpClientException.java
new file mode 100644
index 00000000..fea34f44
--- /dev/null
+++ b/src/ext/java/no/entur/uttu/ext/fintraffic/security/HttpClientException.java
@@ -0,0 +1,8 @@
+package no.entur.uttu.ext.fintraffic.security;
+
+public class HttpClientException extends RuntimeException {
+
+  public HttpClientException(String message, Throwable cause) {
+    super(message, cause);
+  }
+}
diff --git a/src/ext/java/no/entur/uttu/ext/fintraffic/security/model/EntraTokenResponse.java b/src/ext/java/no/entur/uttu/ext/fintraffic/security/model/EntraTokenResponse.java
new file mode 100644
index 00000000..6126ce5f
--- /dev/null
+++ b/src/ext/java/no/entur/uttu/ext/fintraffic/security/model/EntraTokenResponse.java
@@ -0,0 +1,37 @@
+package no.entur.uttu.ext.fintraffic.security.model;
+
+import com.fasterxml.jackson.annotation.JsonCreator;
+import com.fasterxml.jackson.annotation.JsonProperty;
+import java.time.LocalDateTime;
+
+public class EntraTokenResponse {
+
+  private final String tokenType;
+
+  private final LocalDateTime validUntil;
+
+  private final String accessToken;
+
+  @JsonCreator
+  public EntraTokenResponse(
+    @JsonProperty("token_type") String tokenType,
+    @JsonProperty("expires_in") long expiresIn,
+    @JsonProperty("access_token") String accessToken
+  ) {
+    this.tokenType = tokenType;
+    this.validUntil = LocalDateTime.now().plusSeconds(expiresIn);
+    this.accessToken = accessToken;
+  }
+
+  public String getTokenType() {
+    return tokenType;
+  }
+
+  public LocalDateTime getValidUntil() {
+    return validUntil;
+  }
+
+  public String getAccessToken() {
+    return accessToken;
+  }
+}
diff --git a/src/ext/java/no/entur/uttu/ext/fintraffic/security/model/Me.java b/src/ext/java/no/entur/uttu/ext/fintraffic/security/model/Me.java
new file mode 100644
index 00000000..b7a495e3
--- /dev/null
+++ b/src/ext/java/no/entur/uttu/ext/fintraffic/security/model/Me.java
@@ -0,0 +1,5 @@
+package no.entur.uttu.ext.fintraffic.security.model;
+
+import java.util.List;
+
+public record Me(List<VacoCompany> companies) {}
diff --git a/src/ext/java/no/entur/uttu/ext/fintraffic/security/model/VacoApiResponse.java b/src/ext/java/no/entur/uttu/ext/fintraffic/security/model/VacoApiResponse.java
new file mode 100644
index 00000000..0d356470
--- /dev/null
+++ b/src/ext/java/no/entur/uttu/ext/fintraffic/security/model/VacoApiResponse.java
@@ -0,0 +1,3 @@
+package no.entur.uttu.ext.fintraffic.security.model;
+
+public record VacoApiResponse<D>(D data) {}
diff --git a/src/ext/java/no/entur/uttu/ext/fintraffic/security/model/VacoCompany.java b/src/ext/java/no/entur/uttu/ext/fintraffic/security/model/VacoCompany.java
new file mode 100644
index 00000000..a7c8b1a4
--- /dev/null
+++ b/src/ext/java/no/entur/uttu/ext/fintraffic/security/model/VacoCompany.java
@@ -0,0 +1,10 @@
+package no.entur.uttu.ext.fintraffic.security.model;
+
+import java.util.List;
+
+public record VacoCompany(
+  String businessId,
+  String name,
+  String language,
+  List<String> codespaces
+) {}