diff --git a/src/api/SIGCM2.Api/Authorization/PermissionAuthorizationHandler.cs b/src/api/SIGCM2.Api/Authorization/PermissionAuthorizationHandler.cs
new file mode 100644
index 0000000..0efb172
--- /dev/null
+++ b/src/api/SIGCM2.Api/Authorization/PermissionAuthorizationHandler.cs
@@ -0,0 +1,71 @@
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Http;
+using SIGCM2.Application.Abstractions.Persistence;
+
+namespace SIGCM2.Api.Authorization;
+
+/// <summary>
+/// Authorization handler for <see cref="RequirePermissionAttribute"/>.
+/// Reads the "rol" claim from the authenticated user, queries <see cref="IRolPermisoRepository"/>
+/// for the role's assigned permissions, and succeeds if at least one matches (OR semantics).
+/// No caching — UDT-006 design decision D1: always authoritative from DB.
+/// </summary>
+public sealed class PermissionAuthorizationHandler
+    : AuthorizationHandler<RequirePermissionAttribute>
+{
+    private readonly IRolPermisoRepository _rolPermisoRepo;
+    private readonly ILogger<PermissionAuthorizationHandler> _logger;
+
+    public PermissionAuthorizationHandler(
+        IRolPermisoRepository rolPermisoRepo,
+        ILogger<PermissionAuthorizationHandler> logger)
+    {
+        _rolPermisoRepo = rolPermisoRepo;
+        _logger = logger;
+    }
+
+    protected override async Task HandleRequirementAsync(
+        AuthorizationHandlerContext context,
+        RequirePermissionAttribute requirement)
+    {
+        // 1. Must be authenticated — defense-in-depth (AuthorizeAttribute already requires it)
+        if (context.User?.Identity?.IsAuthenticated != true)
+        {
+            return; // implicit Fail — nothing Succeeded
+        }
+
+        // 2. Extract "rol" claim — JwtBearer is configured with RoleClaimType="rol"
+        var rolCodigo = context.User.FindFirst("rol")?.Value;
+        if (string.IsNullOrWhiteSpace(rolCodigo))
+        {
+            _logger.LogWarning(
+                "Authorization failed — token missing 'rol' claim for user {User}",
+                context.User.Identity?.Name);
+            context.Fail(new AuthorizationFailureReason(this, "missing_rol_claim"));
+            return;
+        }
+
+        // 3. Load permissions assigned to this role — no cache (UDT-006 D1)
+        var permisos = await _rolPermisoRepo.GetByRolCodigoAsync(rolCodigo);
+        var permisoCodes = permisos.Select(p => p.Codigo).ToHashSet(StringComparer.Ordinal);
+
+        // 4. OR semantics — any single match is enough
+        var matched = requirement.PermissionCodes
+            .FirstOrDefault(code => permisoCodes.Contains(code));
+
+        if (matched is not null)
+        {
+            context.Succeed(requirement);
+            return;
+        }
+
+        // 5. Stash required permission for ForbiddenProblemDetailsHandler (Batch 3)
+        if (context.Resource is HttpContext httpContext)
+        {
+            httpContext.Items["RequiredPermission"] = requirement.PermissionCodes[0];
+        }
+
+        context.Fail(new AuthorizationFailureReason(this,
+            $"missing_permission:{string.Join('|', requirement.PermissionCodes)}"));
+    }
+}
diff --git a/src/api/SIGCM2.Api/Authorization/RequirePermissionAttribute.cs b/src/api/SIGCM2.Api/Authorization/RequirePermissionAttribute.cs
new file mode 100644
index 0000000..b62a48c
--- /dev/null
+++ b/src/api/SIGCM2.Api/Authorization/RequirePermissionAttribute.cs
@@ -0,0 +1,35 @@
+using Microsoft.AspNetCore.Authorization;
+
+namespace SIGCM2.Api.Authorization;
+
+/// <summary>
+/// Authorization attribute that requires the authenticated user to have at least ONE
+/// of the declared permission codes assigned to their role (OR semantics).
+/// Implements IAuthorizationRequirementData (.NET 8+) so ASP.NET Core builds the policy
+/// on-the-fly from GetRequirements() — no AddPolicy() registration needed.
+/// </summary>
+/// <example>
+/// // Single permission
+/// [RequirePermission("administracion:usuarios:gestionar")]
+///
+/// // Multiple — OR semantics: any single match grants access
+/// [RequirePermission("ventas:contado:crear", "ventas:ctacte:crear")]
+/// </example>
+[AttributeUsage(AttributeTargets.Class | AttributeTargets.Method, AllowMultiple = false)]
+public sealed class RequirePermissionAttribute
+    : AuthorizeAttribute, IAuthorizationRequirement, IAuthorizationRequirementData
+{
+    /// <summary>Permission codes required (OR semantics — at least one must match).</summary>
+    public string[] PermissionCodes { get; }
+
+    public RequirePermissionAttribute(params string[] permissionCodes)
+    {
+        if (permissionCodes is null || permissionCodes.Length == 0)
+            throw new ArgumentException("At least one permission code is required.", nameof(permissionCodes));
+
+        PermissionCodes = permissionCodes;
+    }
+
+    /// <inheritdoc/>
+    public IEnumerable<IAuthorizationRequirement> GetRequirements() => new[] { this };
+}
diff --git a/src/api/SIGCM2.Api/Program.cs b/src/api/SIGCM2.Api/Program.cs
index dfe90f5..545deed 100644
--- a/src/api/SIGCM2.Api/Program.cs
+++ b/src/api/SIGCM2.Api/Program.cs
@@ -1,5 +1,7 @@
+using Microsoft.AspNetCore.Authorization;
 using Serilog;
 using Scalar.AspNetCore;
+using SIGCM2.Api.Authorization;
 using SIGCM2.Application;
 using SIGCM2.Infrastructure;
 using SIGCM2.Api.Filters;
@@ -21,6 +23,10 @@ builder.Host.UseSerilog((ctx, lc) => lc
 builder.Services.AddApplication();
 builder.Services.AddInfrastructure(builder.Configuration);
 
+// Authorization — handler lives in Api layer; DO NOT move to Infrastructure DI
+builder.Services.AddAuthorization();
+builder.Services.AddScoped<IAuthorizationHandler, PermissionAuthorizationHandler>();
+
 // Controllers with exception filter
 builder.Services.AddControllers(opts =>
 {
diff --git a/tests/SIGCM2.Api.Tests/Authorization/PermissionAuthorizationHandlerTests.cs b/tests/SIGCM2.Api.Tests/Authorization/PermissionAuthorizationHandlerTests.cs
new file mode 100644
index 0000000..408bcb7
--- /dev/null
+++ b/tests/SIGCM2.Api.Tests/Authorization/PermissionAuthorizationHandlerTests.cs
@@ -0,0 +1,246 @@
+using System.Security.Claims;
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Http;
+using Microsoft.Extensions.Logging.Abstractions;
+using NSubstitute;
+using SIGCM2.Api.Authorization;
+using SIGCM2.Application.Abstractions.Persistence;
+using SIGCM2.Domain.Entities;
+
+namespace SIGCM2.Api.Tests.Authorization;
+
+/// <summary>
+/// Unit tests for PermissionAuthorizationHandler — SUITE-B-01 (UDT-006).
+/// Tests isolated from DB: IRolPermisoRepository is mocked via NSubstitute.
+/// </summary>
+public sealed class PermissionAuthorizationHandlerTests
+{
+    private readonly IRolPermisoRepository _rolPermisoRepo = Substitute.For<IRolPermisoRepository>();
+    private readonly PermissionAuthorizationHandler _handler;
+
+    public PermissionAuthorizationHandlerTests()
+    {
+        _handler = new PermissionAuthorizationHandler(
+            _rolPermisoRepo,
+            NullLogger<PermissionAuthorizationHandler>.Instance);
+    }
+
+    // ── Helpers ──────────────────────────────────────────────────────────────
+
+    private static ClaimsPrincipal AuthenticatedUserWithRol(string rolValue)
+    {
+        var identity = new ClaimsIdentity(
+            new[] { new Claim("rol", rolValue) },
+            authenticationType: "TestAuth");
+        return new ClaimsPrincipal(identity);
+    }
+
+    private static ClaimsPrincipal AuthenticatedUserWithoutRolClaim()
+    {
+        var identity = new ClaimsIdentity(
+            new[] { new Claim(ClaimTypes.Name, "someuser") },
+            authenticationType: "TestAuth");
+        return new ClaimsPrincipal(identity);
+    }
+
+    private static ClaimsPrincipal AnonymousUser()
+    {
+        return new ClaimsPrincipal(new ClaimsIdentity()); // not authenticated
+    }
+
+    private static Permiso MakePermiso(int id, string codigo) =>
+        Permiso.ForRead(id, codigo, codigo, null, codigo.Split(':')[0], true, DateTime.UtcNow);
+
+    private static AuthorizationHandlerContext MakeContext(
+        ClaimsPrincipal user,
+        RequirePermissionAttribute requirement,
+        HttpContext? httpContext = null)
+    {
+        var ctx = httpContext ?? new DefaultHttpContext();
+        return new AuthorizationHandlerContext(
+            requirements: new[] { requirement },
+            user: user,
+            resource: ctx);
+    }
+
+    // ── B-01-01: Usuario con permiso requerido → Succeed ─────────────────────
+
+    [Fact]
+    public async Task HandleAsync_Succeeds_WhenUserHasRequiredPermission()
+    {
+        // Arrange
+        var user = AuthenticatedUserWithRol("admin");
+        var requirement = new RequirePermissionAttribute("administracion:usuarios:gestionar");
+
+        _rolPermisoRepo.GetByRolCodigoAsync("admin", Arg.Any<CancellationToken>())
+            .Returns(new List<Permiso> { MakePermiso(1, "administracion:usuarios:gestionar") }
+                .AsReadOnly() as IReadOnlyList<Permiso>);
+
+        var context = MakeContext(user, requirement);
+
+        // Act
+        await _handler.HandleAsync(context);
+
+        // Assert
+        Assert.True(context.HasSucceeded);
+    }
+
+    // ── B-01-02: Usuario sin el permiso requerido → Fail ──────────────────────
+
+    [Fact]
+    public async Task HandleAsync_Fails_WhenUserLacksPermission()
+    {
+        // Arrange
+        var user = AuthenticatedUserWithRol("cajero");
+        var requirement = new RequirePermissionAttribute("administracion:usuarios:gestionar");
+
+        _rolPermisoRepo.GetByRolCodigoAsync("cajero", Arg.Any<CancellationToken>())
+            .Returns(new List<Permiso> { MakePermiso(10, "ventas:contado:crear") }
+                .AsReadOnly() as IReadOnlyList<Permiso>);
+
+        var context = MakeContext(user, requirement);
+
+        // Act
+        await _handler.HandleAsync(context);
+
+        // Assert
+        Assert.False(context.HasSucceeded);
+    }
+
+    // ── B-01-03: Multi-permiso OR — tiene uno de los dos → Succeed ────────────
+
+    [Fact]
+    public async Task HandleAsync_Succeeds_WhenAnyOfMultiplePermissions_OR()
+    {
+        // Arrange
+        var user = AuthenticatedUserWithRol("cajero");
+        var requirement = new RequirePermissionAttribute(
+            "ventas:contado:crear",
+            "administracion:usuarios:gestionar");
+
+        _rolPermisoRepo.GetByRolCodigoAsync("cajero", Arg.Any<CancellationToken>())
+            .Returns(new List<Permiso>
+            {
+                MakePermiso(10, "ventas:contado:crear"),
+                MakePermiso(11, "ventas:contado:cobrar"),
+            }.AsReadOnly() as IReadOnlyList<Permiso>);
+
+        var context = MakeContext(user, requirement);
+
+        // Act
+        await _handler.HandleAsync(context);
+
+        // Assert
+        Assert.True(context.HasSucceeded);
+    }
+
+    // ── B-01-04: Multi-permiso OR — no tiene ninguno → Fail ───────────────────
+
+    [Fact]
+    public async Task HandleAsync_Fails_WhenNoneOfMultiplePermissions()
+    {
+        // Arrange
+        var user = AuthenticatedUserWithRol("cajero");
+        var requirement = new RequirePermissionAttribute(
+            "administracion:usuarios:gestionar",
+            "administracion:roles:gestionar");
+
+        _rolPermisoRepo.GetByRolCodigoAsync("cajero", Arg.Any<CancellationToken>())
+            .Returns(new List<Permiso> { MakePermiso(10, "ventas:contado:crear") }
+                .AsReadOnly() as IReadOnlyList<Permiso>);
+
+        var context = MakeContext(user, requirement);
+
+        // Act
+        await _handler.HandleAsync(context);
+
+        // Assert
+        Assert.False(context.HasSucceeded);
+    }
+
+    // ── B-01-05: Claim "rol" ausente → Fail; repo nunca llamado ───────────────
+
+    [Fact]
+    public async Task HandleAsync_Fails_WhenRolClaimMissing()
+    {
+        // Arrange
+        var user = AuthenticatedUserWithoutRolClaim();
+        var requirement = new RequirePermissionAttribute("administracion:usuarios:gestionar");
+        var context = MakeContext(user, requirement);
+
+        // Act
+        await _handler.HandleAsync(context);
+
+        // Assert
+        Assert.False(context.HasSucceeded);
+        // Repo must NOT be called when claim is absent
+        await _rolPermisoRepo.DidNotReceive()
+            .GetByRolCodigoAsync(Arg.Any<string>(), Arg.Any<CancellationToken>());
+    }
+
+    // ── B-01-06: Repo devuelve lista vacía → Fail ─────────────────────────────
+
+    [Fact]
+    public async Task HandleAsync_Fails_WhenRoleHasNoPermissions()
+    {
+        // Arrange
+        var user = AuthenticatedUserWithRol("reportes");
+        var requirement = new RequirePermissionAttribute("administracion:usuarios:gestionar");
+
+        _rolPermisoRepo.GetByRolCodigoAsync("reportes", Arg.Any<CancellationToken>())
+            .Returns(new List<Permiso>().AsReadOnly() as IReadOnlyList<Permiso>);
+
+        var context = MakeContext(user, requirement);
+
+        // Act
+        await _handler.HandleAsync(context);
+
+        // Assert
+        Assert.False(context.HasSucceeded);
+    }
+
+    // ── B-01-07: Rol no existe en RolPermiso (mismo caso que lista vacía) ──────
+
+    [Fact]
+    public async Task HandleAsync_Fails_WhenRoleDoesNotExistInRolPermisoTable()
+    {
+        // Arrange
+        var user = AuthenticatedUserWithRol("rol_fantasma");
+        var requirement = new RequirePermissionAttribute("administracion:usuarios:gestionar");
+
+        _rolPermisoRepo.GetByRolCodigoAsync("rol_fantasma", Arg.Any<CancellationToken>())
+            .Returns(new List<Permiso>().AsReadOnly() as IReadOnlyList<Permiso>);
+
+        var context = MakeContext(user, requirement);
+
+        // Act
+        await _handler.HandleAsync(context);
+
+        // Assert
+        Assert.False(context.HasSucceeded);
+    }
+
+    // ── B-01-08: Fail stashea RequiredPermission en HttpContext.Items ──────────
+
+    [Fact]
+    public async Task HandleAsync_StashesRequiredPermission_InHttpContextItems_OnFail()
+    {
+        // Arrange
+        var user = AuthenticatedUserWithRol("cajero");
+        var requirement = new RequirePermissionAttribute("administracion:usuarios:gestionar");
+
+        _rolPermisoRepo.GetByRolCodigoAsync("cajero", Arg.Any<CancellationToken>())
+            .Returns(new List<Permiso> { MakePermiso(10, "ventas:contado:crear") }
+                .AsReadOnly() as IReadOnlyList<Permiso>);
+
+        var httpContext = new DefaultHttpContext();
+        var context = MakeContext(user, requirement, httpContext);
+
+        // Act
+        await _handler.HandleAsync(context);
+
+        // Assert — context.Resource is the HttpContext where items are stashed
+        Assert.False(context.HasSucceeded);
+        Assert.Equal("administracion:usuarios:gestionar", httpContext.Items["RequiredPermission"]);
+    }
+}