diff --git a/router/middleware/perm/perm.go b/router/middleware/perm/perm.go
index 560753ad8..fe7cea501 100644
--- a/router/middleware/perm/perm.go
+++ b/router/middleware/perm/perm.go
@@ -417,6 +417,7 @@ func MustWrite() gin.HandlerFunc {
 // MustRead ensures the user has admin, write or read access to the repo.
 func MustRead() gin.HandlerFunc {
 	return func(c *gin.Context) {
+		cl := claims.Retrieve(c)
 		o := org.Retrieve(c)
 		r := repo.Retrieve(c)
 		u := user.Retrieve(c)
@@ -437,8 +438,23 @@ func MustRead() gin.HandlerFunc {
 			return
 		}
 
+		// return if request is from worker with build token access
+		if strings.EqualFold(cl.TokenType, constants.WorkerBuildTokenType) {
+			b := build.Retrieve(c)
+			if cl.BuildID == b.GetID() {
+				return
+			}
+
+			retErr := fmt.Errorf("subject %s does not have 'read' permissions for repo %s", cl.Subject, r.GetFullName())
+
+			util.HandleError(c, http.StatusUnauthorized, retErr)
+
+			return
+		}
+
 		logger.Debugf("verifying user %s has 'read' permissions for repo %s", u.GetName(), r.GetFullName())
 
+		// return if user is platform admin
 		if u.GetAdmin() {
 			return
 		}
diff --git a/router/middleware/perm/perm_test.go b/router/middleware/perm/perm_test.go
index a47dcef40..98b00aefd 100644
--- a/router/middleware/perm/perm_test.go
+++ b/router/middleware/perm/perm_test.go
@@ -1719,6 +1719,88 @@ func TestPerm_MustRead_PlatAdmin(t *testing.T) {
 	}
 }
 
+func TestPerm_MustRead_WorkerBuildToken(t *testing.T) {
+	// setup types
+	secret := "superSecret"
+
+	tm := &token.Manager{
+		PrivateKey:               "123abc",
+		SignMethod:               jwt.SigningMethodHS256,
+		UserAccessTokenDuration:  time.Minute * 5,
+		UserRefreshTokenDuration: time.Minute * 30,
+	}
+
+	r := new(library.Repo)
+	r.SetID(1)
+	r.SetUserID(1)
+	r.SetHash("baz")
+	r.SetOrg("foo")
+	r.SetName("bar")
+	r.SetFullName("foo/bar")
+	r.SetVisibility("private")
+
+	b := new(library.Build)
+	b.SetID(1)
+	b.SetRepoID(1)
+	b.SetNumber(1)
+
+	mto := &token.MintTokenOpts{
+		Hostname:      "worker",
+		TokenDuration: time.Minute * 35,
+		TokenType:     constants.WorkerBuildTokenType,
+		BuildID:       1,
+		Repo:          "foo/bar",
+	}
+
+	tok, _ := tm.MintToken(mto)
+
+	// setup context
+	gin.SetMode(gin.TestMode)
+
+	resp := httptest.NewRecorder()
+	context, engine := gin.CreateTestContext(resp)
+
+	// setup database
+	db, _ := sqlite.NewTest()
+
+	defer func() {
+		db.Sqlite.Exec("delete from builds")
+		db.Sqlite.Exec("delete from repos;")
+		_sql, _ := db.Sqlite.DB()
+		_sql.Close()
+	}()
+
+	_ = db.CreateBuild(b)
+	_ = db.CreateRepo(r)
+
+	context.Request, _ = http.NewRequest(http.MethodGet, "/test/foo/bar/builds/1", nil)
+	context.Request.Header.Add("Authorization", fmt.Sprintf("Bearer %s", tok))
+
+	// setup vela mock server
+	engine.Use(func(c *gin.Context) { c.Set("secret", secret) })
+	engine.Use(func(c *gin.Context) { c.Set("token-manager", tm) })
+	engine.Use(func(c *gin.Context) { database.ToContext(c, db) })
+	engine.Use(claims.Establish())
+	engine.Use(user.Establish())
+	engine.Use(org.Establish())
+	engine.Use(repo.Establish())
+	engine.Use(build.Establish())
+	engine.Use(MustRead())
+	engine.GET("/test/:org/:repo/builds/:build", func(c *gin.Context) {
+		c.Status(http.StatusOK)
+	})
+
+	s1 := httptest.NewServer(engine)
+	defer s1.Close()
+
+	// run test
+	engine.ServeHTTP(context.Writer, context.Request)
+
+	if resp.Code != http.StatusOK {
+		t.Errorf("MustRead returned %v, want %v", resp.Code, http.StatusOK)
+	}
+}
+
 func TestPerm_MustRead_RepoAdmin(t *testing.T) {
 	// setup types
 	secret := "superSecret"