diff --git a/scm-ui-components/packages/ui-components/src/Breadcrumb.js b/scm-ui-components/packages/ui-components/src/Breadcrumb.js
index d2f3409af6..5b0f151c61 100644
--- a/scm-ui-components/packages/ui-components/src/Breadcrumb.js
+++ b/scm-ui-components/packages/ui-components/src/Breadcrumb.js
@@ -1,10 +1,9 @@
 //@flow
 import React from "react";
-import { Link } from "react-router-dom";
-import type { Branch, Repository } from "@scm-manager/ui-types";
+import {Link} from "react-router-dom";
+import type {Branch, Repository} from "@scm-manager/ui-types";
 import injectSheet from "react-jss";
-import { ExtensionPoint, binder } from "@scm-manager/ui-extensions";
-import {ButtonGroup} from "./buttons";
+import {binder, ExtensionPoint} from "@scm-manager/ui-extensions";
 import classNames from "classnames";
 
 type Props = {
@@ -64,33 +63,48 @@ class Breadcrumb extends React.Component<Props> {
   }
 
   render() {
-    const { classes, baseUrl, branch, defaultBranch, branches, revision, path, repository } = this.props;
+    const {
+      classes,
+      baseUrl,
+      branch,
+      defaultBranch,
+      branches,
+      revision,
+      path,
+      repository
+    } = this.props;
 
     return (
       <>
         <div className={classes.flexRow}>
-          <nav className={classNames(classes.flexStart, "breadcrumb sources-breadcrumb")} aria-label="breadcrumbs">
+          <nav
+            className={classNames(
+              classes.flexStart,
+              "breadcrumb sources-breadcrumb"
+            )}
+            aria-label="breadcrumbs"
+          >
             <ul>{this.renderPath()}</ul>
           </nav>
-          {
-            binder.hasExtension("repos.sources.actionbar") &&
+          {binder.hasExtension("repos.sources.actionbar") && (
             <div className={classes.buttonGroup}>
-              <ButtonGroup>
-                <ExtensionPoint
-                  name="repos.sources.actionbar"
-                  props={{
-                    baseUrl,
-                    branch: branch ? branch : defaultBranch,
-                    path,
-                    isBranchUrl: branches &&
-                      branches.filter(b => b.name.replace("/", "%2F") === revision).length > 0,
-                    repository
-                  }}
-                  renderAll={true}
-                />
-              </ButtonGroup>
+              <ExtensionPoint
+                name="repos.sources.actionbar"
+                props={{
+                  baseUrl,
+                  branch: branch ? branch : defaultBranch,
+                  path,
+                  isBranchUrl:
+                    branches &&
+                    branches.filter(
+                      b => b.name.replace("/", "%2F") === revision
+                    ).length > 0,
+                  repository
+                }}
+                renderAll={true}
+              />
             </div>
-          }
+          )}
         </div>
         <hr className={classes.noMargin} />
       </>
diff --git a/scm-ui-components/packages/ui-components/src/validation.js b/scm-ui-components/packages/ui-components/src/validation.js
index fcfffcee45..98a36c6f0e 100644
--- a/scm-ui-components/packages/ui-components/src/validation.js
+++ b/scm-ui-components/packages/ui-components/src/validation.js
@@ -5,7 +5,7 @@ export const isNameValid = (name: string) => {
   return nameRegex.test(name);
 };
 
-const mailRegex  =  /^[ -~]+@[A-Za-z0-9][\w\-.]*\.[A-Za-z0-9][A-Za-z0-9-]+$/;
+const mailRegex = /^[ -~]+@[A-Za-z0-9][\w\-.]*\.[A-Za-z0-9][A-Za-z0-9-]+$/;
 
 export const isMailValid = (mail: string) => {
   return mailRegex.test(mail);
@@ -14,3 +14,9 @@ export const isMailValid = (mail: string) => {
 export const isNumberValid = (number: string) => {
   return !isNaN(number);
 };
+
+const pathRegex = /^((?!\/{2,}).)*$/;
+
+export const isPathValid = (path: string) => {
+  return pathRegex.test(path);
+};
diff --git a/scm-ui-components/packages/ui-components/src/validation.test.js b/scm-ui-components/packages/ui-components/src/validation.test.js
index d50996ff2b..4af5d755d0 100644
--- a/scm-ui-components/packages/ui-components/src/validation.test.js
+++ b/scm-ui-components/packages/ui-components/src/validation.test.js
@@ -2,102 +2,117 @@
 import * as validator from "./validation";
 
 describe("test name validation", () => {
-  it("should return false", () => {
-    // invalid names taken from ValidationUtilTest.java
-    const invalidNames = [
-      "@test",
-      " test 123",
-      " test 123 ",
-      "test 123 ",
-      "test/123",
-      "test%123",
-      "test:123",
-      "t ",
-      " t",
-      " t ",
-      "",
+  // invalid names taken from ValidationUtilTest.java
+  const invalidNames = [
+    "@test",
+    " test 123",
+    " test 123 ",
+    "test 123 ",
+    "test/123",
+    "test%123",
+    "test:123",
+    "t ",
+    " t",
+    " t ",
+    "",
 
-      " invalid_name",
-      "another%one",
-      "!!!",
-      "!_!"
-    ];
-    for (let name of invalidNames) {
+    " invalid_name",
+    "another%one",
+    "!!!",
+    "!_!"
+  ];
+  for (let name of invalidNames) {
+    it(`should return false for '${name}'`, () => {
       expect(validator.isNameValid(name)).toBe(false);
-    }
-  });
+    });
+  }
 
-  it("should return true", () => {
-    // valid names taken from ValidationUtilTest.java
-    const validNames = [
-      "test",
-      "test.git",
-      "Test123.git",
-      "Test123-git",
-      "Test_user-123.git",
-      "test@scm-manager.de",
-      "test123",
-      "tt",
-      "t",
-      "valid_name",
-      "another1",
-      "stillValid",
-      "this.one_as-well",
-      "and@this"
-    ];
-    for (let name of validNames) {
+  // valid names taken from ValidationUtilTest.java
+  const validNames = [
+    "test",
+    "test.git",
+    "Test123.git",
+    "Test123-git",
+    "Test_user-123.git",
+    "test@scm-manager.de",
+    "test123",
+    "tt",
+    "t",
+    "valid_name",
+    "another1",
+    "stillValid",
+    "this.one_as-well",
+    "and@this"
+  ];
+  for (let name of validNames) {
+    it(`should return true for '${name}'`, () => {
       expect(validator.isNameValid(name)).toBe(true);
-    }
-  });
+    });
+  }
 });
 
 describe("test mail validation", () => {
-  it("should return false", () => {
-    // invalid taken from ValidationUtilTest.java
-    const invalid = [
-      "ostfalia.de",
-      "@ostfalia.de",
-      "s.sdorra@",
-      "s.sdorra@ostfalia",
-      "s.sdorra@ ostfalia.de",
-      "s.sdorra@[ostfalia.de"
-    ];
-    for (let mail of invalid) {
+  // invalid taken from ValidationUtilTest.java
+  const invalid = [
+    "ostfalia.de",
+    "@ostfalia.de",
+    "s.sdorra@",
+    "s.sdorra@ostfalia",
+    "s.sdorra@ ostfalia.de",
+    "s.sdorra@[ostfalia.de"
+  ];
+  for (let mail of invalid) {
+    it(`should return false for '${mail}'`, () => {
       expect(validator.isMailValid(mail)).toBe(false);
-    }
-  });
+    });
+  }
 
-  it("should return true", () => {
-    // valid taken from ValidationUtilTest.java
-    const valid = [
-      "s.sdorra@ostfalia.de",
-      "sdorra@ostfalia.de",
-      "s.sdorra@hbk-bs.de",
-      "s.sdorra@gmail.com",
-      "s.sdorra@t.co",
-      "s.sdorra@ucla.college",
-      "s.sdorra@example.xn--p1ai",
-      "s.sdorra@scm.solutions",
-      "s'sdorra@scm.solutions",
-      "\"S Sdorra\"@scm.solutions"
-    ];
-    for (let mail of valid) {
+  // valid taken from ValidationUtilTest.java
+  const valid = [
+    "s.sdorra@ostfalia.de",
+    "sdorra@ostfalia.de",
+    "s.sdorra@hbk-bs.de",
+    "s.sdorra@gmail.com",
+    "s.sdorra@t.co",
+    "s.sdorra@ucla.college",
+    "s.sdorra@example.xn--p1ai",
+    "s.sdorra@scm.solutions",
+    "s'sdorra@scm.solutions",
+    "\"S Sdorra\"@scm.solutions"
+  ];
+  for (let mail of valid) {
+    it(`should return true for '${mail}'`, () => {
       expect(validator.isMailValid(mail)).toBe(true);
-    }
-  });
+    });
+  }
 });
 
 describe("test number validation", () => {
-  it("should return false", () => {
-    const invalid = ["1a", "35gu", "dj6", "45,5", "test"];
-    for (let number of invalid) {
-      expect(validator.isNumberValid(number)).toBe(false);
-    }
-  });
-  it("should return true", () => {
-    const valid = ["1", "35", "2", "235", "34.4"];
-    for (let number of valid) {
+  const invalid = ["1a", "35gu", "dj6", "45,5", "test"];
+  for (let number of invalid) {
+    it(`should return false for '${number}'`, () => {
+        expect(validator.isNumberValid(number)).toBe(false);
+    });
+  }
+  const valid = ["1", "35", "2", "235", "34.4"];
+  for (let number of valid) {
+    it(`should return true for '${number}'`, () => {
       expect(validator.isNumberValid(number)).toBe(true);
-    }
-  });
+    });
+  }
+});
+
+describe("test path validation", () => {
+  const invalid = ["//", "some//path", "end//"];
+  for (let path of invalid) {
+    it(`should return false for '${path}'`, () => {
+      expect(validator.isPathValid(path)).toBe(false);
+    });
+  }
+  const valid = ["", "/", "dir", "some/path", "end/"];
+  for (let path of valid) {
+    it(`should return true for '${path}'`, () => {
+      expect(validator.isPathValid(path)).toBe(true);
+    });
+  }
 });
diff --git a/scm-ui/src/repos/sources/containers/Content.js b/scm-ui/src/repos/sources/containers/Content.js
index b9032ae681..4d297c05bc 100644
--- a/scm-ui/src/repos/sources/containers/Content.js
+++ b/scm-ui/src/repos/sources/containers/Content.js
@@ -106,17 +106,15 @@ class Content extends React.Component<Props, State> {
           </div>
           <div className="buttons is-grouped">
             <div className={classes.marginInHeader}>{selector}</div>
-            <ButtonGroup>
-              <ExtensionPoint
-                name="repos.sources.content.actionbar"
-                props={{
-                  file,
-                  revision,
-                  handleExtensionError: this.handleExtensionError
-                }}
-                renderAll={true}
-              />
-            </ButtonGroup>
+            <ExtensionPoint
+              name="repos.sources.content.actionbar"
+              props={{
+                file,
+                revision,
+                handleExtensionError: this.handleExtensionError
+              }}
+              renderAll={true}
+            />
           </div>
         </article>
       </span>
diff --git a/scm-ui/src/users/components/userValidation.js b/scm-ui/src/users/components/userValidation.js
index c9460fdd50..e53dce229c 100644
--- a/scm-ui/src/users/components/userValidation.js
+++ b/scm-ui/src/users/components/userValidation.js
@@ -2,9 +2,9 @@
 
 import { validation } from "@scm-manager/ui-components";
 
-const { isNameValid, isMailValid } = validation;
+const { isNameValid, isMailValid, isPathValid } = validation;
 
-export { isNameValid, isMailValid };
+export { isNameValid, isMailValid, isPathValid };
 
 export const isDisplayNameValid = (displayName: string) => {
   if (displayName) {