diff --git a/runtime/ftplugin/ps1.vim b/runtime/ftplugin/ps1.vim
index f1fe78df4c..9ff764a282 100644
--- a/runtime/ftplugin/ps1.vim
+++ b/runtime/ftplugin/ps1.vim
@@ -6,6 +6,7 @@
 "              2024 May 23 by Riley Bruins <ribru17@gmail.com> ('commentstring')
 "              2024 Sep 19 by Konfekt (simplify keywordprg #15696)
 "              2025 Jul 22 by phanium (use :hor term #17822)
+"              2026 Jul 10 by Vim Project (quote K argument, prevent command injection)
 
 " Only do this when not done yet for this buffer
 if exists("b:did_ftplugin") | finish | endif
@@ -52,9 +53,9 @@ endif
 
 if exists('s:pwsh_cmd')
   if exists(':terminal') == 2
-    command! -buffer -nargs=1 GetHelp silent exe 'hor term ' . s:pwsh_cmd . ' -NoLogo -NoProfile -NonInteractive -ExecutionPolicy RemoteSigned -Command Get-Help -Full "<args>"' . (executable('less') ? ' | less' : '')
+    command! -buffer -nargs=1 GetHelp call term_start([s:pwsh_cmd, '-NoLogo', '-NoProfile', '-NonInteractive', '-ExecutionPolicy', 'RemoteSigned', '-Command', "Get-Help -Full '" . substitute(<q-args>, "'", "''", 'g') . "'" . (executable('less') ? ' | less' : '')])
   else
-    command! -buffer -nargs=1 GetHelp echo system(s:pwsh_cmd . ' -NoLogo -NoProfile -NonInteractive -ExecutionPolicy RemoteSigned -Command Get-Help -Full <args>')
+    command! -buffer -nargs=1 GetHelp echo system([s:pwsh_cmd, '-NoLogo', '-NoProfile', '-NonInteractive', '-ExecutionPolicy', 'RemoteSigned', '-Command', "Get-Help -Full '" . substitute(<q-args>, "'", "''", 'g') . "'"])
   endif
   setlocal keywordprg=:GetHelp
   let b:undo_ftplugin ..= " | setl kp< | sil! delc -buffer GetHelp"
diff --git a/runtime/ftplugin/sh.vim b/runtime/ftplugin/sh.vim
index 18cd219cdc..45e6f44fcf 100644
--- a/runtime/ftplugin/sh.vim
+++ b/runtime/ftplugin/sh.vim
@@ -8,6 +8,7 @@
 "			2024 Dec 29 by Vim Project (improve setting shellcheck compiler)
 "			2025 Mar 09 by Vim Project (set b:match_skip)
 "			2025 Jul 22 by phanium (use :hor term #17822)
+"			2026 Jul 10 by Vim Project (pass K argument as a list, prevent shell injection)
 
 if exists("b:did_ftplugin")
   finish
@@ -54,9 +55,9 @@ let s:is_kornshell = get(b:, "is_kornshell", get(g:, "is_kornshell", 0))
 
 if s:is_bash
   if exists(':terminal') == 2
-    command! -buffer -nargs=1 ShKeywordPrg silent exe ':hor term bash -c "help "<args>" 2>/dev/null || man "<args>""'
+    command! -buffer -nargs=1 ShKeywordPrg call term_start(['bash', '-c', 'help "$1" 2>/dev/null || man "$1"', '--', <q-args>])
   else
-    command! -buffer -nargs=1 ShKeywordPrg echo system('bash -c "help <args>" 2>/dev/null || MANPAGER= man "<args>"')
+    command! -buffer -nargs=1 ShKeywordPrg echo system(['bash', '-c', 'help "$1" 2>/dev/null || MANPAGER= man "$1"', '--', <q-args>])
   endif
   setlocal keywordprg=:ShKeywordPrg
   let b:undo_ftplugin ..= " | setl kp< | sil! delc -buffer ShKeywordPrg"
diff --git a/runtime/ftplugin/zsh.vim b/runtime/ftplugin/zsh.vim
index 850bef055c..8163585939 100644
--- a/runtime/ftplugin/zsh.vim
+++ b/runtime/ftplugin/zsh.vim
@@ -2,7 +2,7 @@
 " Language:             Zsh shell script
 " Maintainer:           Christian Brabandt <cb@256bit.org>
 " Previous Maintainer:  Nikolai Weibull <now@bitwi.se>
-" Latest Revision:      2025 Jul 23
+" Latest Revision:      2026 Jul 23
 " License:              Vim (see :h license)
 " Repository:           https://github.com/chrisbra/vim-zsh
 
@@ -25,9 +25,9 @@ endif
 
 if executable('zsh') && &shell !~# '/\%(nologin\|false\)$'
   if exists(':terminal') == 2
-    command! -buffer -nargs=1 ZshKeywordPrg silent exe ':hor :term zsh -c "autoload -Uz run-help; run-help <args>"'
-  else
-    command! -buffer -nargs=1 ZshKeywordPrg echo system('MANPAGER= zsh -c "autoload -Uz run-help; run-help <args> 2>/dev/null"')
+    command! -buffer -nargs=1 ZshKeywordPrg call term_start(['zsh', '-c', 'autoload -Uz run-help; run-help "$1"', '--', <q-args>])
+  elseif has("patch-9.2.0250")
+    command! -buffer -nargs=1 ZshKeywordPrg echo system(['zsh', '-c', 'autoload -Uz run-help; MANPAGER= run-help "$1" 2>/dev/null', '--', <q-args>])
   endif
   setlocal keywordprg=:ZshKeywordPrg
   let b:undo_ftplugin .= '| setl keywordprg< | sil! delc -buffer ZshKeywordPrg'