diff --git a/apps/cli/src/http/routes/web/cache.test.ts b/apps/cli/src/http/routes/web/cache.test.ts
new file mode 100644
index 00000000..48534811
--- /dev/null
+++ b/apps/cli/src/http/routes/web/cache.test.ts
@@ -0,0 +1,29 @@
+import { describe, it } from 'node:test'
+import assert from 'node:assert/strict'
+import { openDirectoryPath, showPathInFolder } from './cache'
+
+describe('CLI Web cache route helpers', () => {
+  it('opens directories with execFile arguments instead of shell commands', async () => {
+    const calls: Array<{ file: string; args: string[] }> = []
+    const dirPath = '/tmp/chat"lab; touch /tmp/pwned'
+
+    await openDirectoryPath(dirPath, 'darwin', (file, args, callback) => {
+      calls.push({ file, args })
+      callback(null)
+    })
+
+    assert.deepEqual(calls, [{ file: 'open', args: [dirPath] }])
+  })
+
+  it('reveals files with execFile arguments instead of shell commands', async () => {
+    const calls: Array<{ file: string; args: string[] }> = []
+    const filePath = '/tmp/chat"lab; touch /tmp/pwned/export.json'
+
+    await showPathInFolder(filePath, 'darwin', (file, args, callback) => {
+      calls.push({ file, args })
+      callback(null)
+    })
+
+    assert.deepEqual(calls, [{ file: 'open', args: ['-R', filePath] }])
+  })
+})
diff --git a/apps/cli/src/http/routes/web/cache.ts b/apps/cli/src/http/routes/web/cache.ts
index cffe81d2..e993f765 100644
--- a/apps/cli/src/http/routes/web/cache.ts
+++ b/apps/cli/src/http/routes/web/cache.ts
@@ -1,10 +1,53 @@
 import * as fs from 'fs'
 import * as fsp from 'fs/promises'
 import * as path from 'path'
+import { execFile } from 'child_process'
 import type { FastifyInstance } from 'fastify'
 import type { PathProvider } from '@openchatlab/core'
 import { loadConfig } from '@openchatlab/config'
 
+type ExecFileRunner = (file: string, args: string[], callback: (error: Error | null) => void) => unknown
+
+function runExecFile(file: string, args: string[], runner: ExecFileRunner = execFile): Promise<void> {
+  return new Promise((resolve, reject) => {
+    runner(file, args, (error) => {
+      if (error) {
+        reject(error)
+        return
+      }
+      resolve()
+    })
+  })
+}
+
+export async function openDirectoryPath(
+  dirPath: string,
+  platform: NodeJS.Platform = process.platform,
+  runner?: ExecFileRunner
+): Promise<void> {
+  if (platform === 'darwin') {
+    await runExecFile('open', [dirPath], runner)
+  } else if (platform === 'win32') {
+    await runExecFile('explorer.exe', [dirPath], runner)
+  } else {
+    await runExecFile('xdg-open', [dirPath], runner)
+  }
+}
+
+export async function showPathInFolder(
+  filePath: string,
+  platform: NodeJS.Platform = process.platform,
+  runner?: ExecFileRunner
+): Promise<void> {
+  if (platform === 'darwin') {
+    await runExecFile('open', ['-R', filePath], runner)
+  } else if (platform === 'win32') {
+    await runExecFile('explorer.exe', [`/select,${filePath}`], runner)
+  } else {
+    await runExecFile('xdg-open', [path.dirname(filePath)], runner)
+  }
+}
+
 async function getDirSize(dirPath: string): Promise<number> {
   let totalSize = 0
   try {
@@ -142,14 +185,10 @@ export function registerCacheRoutes(server: FastifyInstance, pathProvider: PathP
       await fsp.mkdir(dirPath, { recursive: true })
     }
 
-    const { exec } = await import('child_process')
-    const platform = process.platform
-    if (platform === 'darwin') {
-      exec(`open "${dirPath}"`)
-    } else if (platform === 'win32') {
-      exec(`explorer "${dirPath}"`)
-    } else {
-      exec(`xdg-open "${dirPath}"`)
+    try {
+      await openDirectoryPath(dirPath)
+    } catch (error) {
+      return { success: false, error: error instanceof Error ? error.message : String(error) }
     }
     return { success: true }
   })
@@ -216,16 +255,10 @@ export function registerCacheRoutes(server: FastifyInstance, pathProvider: PathP
       return { success: false, error: 'filePath is required' }
     }
 
-    const { exec } = await import('child_process')
-    const platform = process.platform
-    const dir = path.dirname(filePath)
-
-    if (platform === 'darwin') {
-      exec(`open -R "${filePath}"`)
-    } else if (platform === 'win32') {
-      exec(`explorer /select,"${filePath}"`)
-    } else {
-      exec(`xdg-open "${dir}"`)
+    try {
+      await showPathInFolder(filePath)
+    } catch (error) {
+      return { success: false, error: error instanceof Error ? error.message : String(error) }
     }
 
     return { success: true }
diff --git a/apps/cli/src/http/routes/web/index.ts b/apps/cli/src/http/routes/web/index.ts
index f566f8a2..e51328e4 100644
--- a/apps/cli/src/http/routes/web/index.ts
+++ b/apps/cli/src/http/routes/web/index.ts
@@ -53,6 +53,7 @@ function isNewerVersion(latest: string, current: string): boolean {
   if (l.minor !== c.minor) return l.minor > c.minor
   if (l.patch !== c.patch) return l.patch > c.patch
   // Same core version: stable > pre-release
+  // Design note: prerelease-to-prerelease updates are intentionally not surfaced.
   if (c.pre && !l.pre) return true
   return false
 }
diff --git a/apps/cli/src/update-checker.ts b/apps/cli/src/update-checker.ts
index c26651c0..07399fee 100644
--- a/apps/cli/src/update-checker.ts
+++ b/apps/cli/src/update-checker.ts
@@ -55,6 +55,8 @@ function isNewerVersion(latest: string, current: string): boolean {
   if (l.major !== c.major) return l.major > c.major
   if (l.minor !== c.minor) return l.minor > c.minor
   if (l.patch !== c.patch) return l.patch > c.patch
+  // Design note: prerelease users are not prompted for prerelease-to-prerelease updates.
+  // Only a stable release with the same core version should supersede a prerelease build.
   if (c.pre && !l.pre) return true
   return false
 }