diff --git a/test/segments/vcs-git.spec b/test/segments/vcs-git.spec
index 17a277fb..ab2962c8 100755
--- a/test/segments/vcs-git.spec
+++ b/test/segments/vcs-git.spec
@@ -490,4 +490,17 @@ function testDetectingUntrackedFilesInCleanSubdirectoryWorks() {
    assertEquals "%K{002} %F{000} master ? %k%F{002}%f " "$(build_left_prompt)"
 }
 
+function testBranchNameScriptingVulnerability() {
+  local -a POWERLEVEL9K_LEFT_PROMPT_ELEMENTS
+  POWERLEVEL9K_LEFT_PROMPT_ELEMENTS=(vcs)
+  echo "#!/bin/sh\n\necho 'hacked'\n" > evil_script.sh
+  chmod +x evil_script.sh
+
+  git checkout -b '$(./evil_script.sh)' 2>/dev/null
+  git add . 2>/dev/null
+  git commit -m "Initial commit" >/dev/null
+
+  assertEquals '%K{002} %F{000} $(./evil_script.sh) %k%F{002}%f ' "$(build_left_prompt)"
+}
+
 source shunit2/shunit2
diff --git a/test/segments/vcs-hg.spec b/test/segments/vcs-hg.spec
index 2903f544..c4289cef 100755
--- a/test/segments/vcs-hg.spec
+++ b/test/segments/vcs-hg.spec
@@ -204,4 +204,17 @@ function testBookmarkIconWorks() {
   assertEquals "%K{002} %F{000} default Binitial %k%F{002}%f " "$(build_left_prompt)"
 }
 
-source shunit2/shunit2
\ No newline at end of file
+function testBranchNameScriptingVulnerability() {
+  local -a POWERLEVEL9K_LEFT_PROMPT_ELEMENTS
+  POWERLEVEL9K_LEFT_PROMPT_ELEMENTS=(vcs)
+  echo "#!/bin/sh\n\necho 'hacked'\n" > evil_script.sh
+  chmod +x evil_script.sh
+
+  hg branch '$(./evil_script.sh)' >/dev/null
+  hg add . >/dev/null
+  hg commit -m "Initial commit" >/dev/null
+
+  assertEquals '%K{002} %F{000} $(./evil_script.sh) %k%F{002}%f ' "$(build_left_prompt)"
+}
+
+source shunit2/shunit2