diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1dd930619e3..f3dcb300dd2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -210,6 +210,7 @@ Docs: https://docs.openclaw.ai
 - Security/Windows: validate `SystemRoot`/`WINDIR` env values through the Windows install-root validator and add them to the dangerous-host-env policy when resolving `icacls.exe`/`whoami.exe` for `openclaw security audit`, so workspace `.env` overrides and bare command names cannot redirect Windows ACL helpers to attacker-controlled binaries. (#74458) Thanks @mmaps.
 - Security/Windows: pin Windows registry-probe `reg.exe` resolution to the canonical Windows install root in install-root probing, so `SystemRoot`/`WINDIR` env overrides cannot redirect registry queries during Windows host detection. (#74454) Thanks @mmaps.
 - QQBot: preserve the framework command authorization decision when converting framework command contexts into engine slash command contexts, so downstream slash handlers see `commandAuthorized` matching the channel's resolved `isAuthorizedSender` instead of a hardcoded `true`. (#77453) Thanks @drobison00.
+- Security/Windows: block `LOCALAPPDATA` from workspace `.env` and resolve Windows update-flow portable Git path prepends from the trusted process-local `LOCALAPPDATA` only, so workspace-supplied values cannot redirect `git` discovery during `openclaw update`. (#77470) Thanks @drobison00.
 
 ## 2026.5.3-1
 
diff --git a/src/infra/dotenv.test.ts b/src/infra/dotenv.test.ts
index 1beb8e9e19c..d9f73a84dfd 100644
--- a/src/infra/dotenv.test.ts
+++ b/src/infra/dotenv.test.ts
@@ -44,6 +44,8 @@ const BUNDLED_TRUST_ROOT_ENV_KEYS = BUNDLED_TRUST_ROOT_ENV_LINES.map(
 const WINDOWS_SHELL_TRUST_ROOT_ENV_KEYS = [
   "ComSpec",
   "COMSPEC",
+  "LocalAppData",
+  "LOCALAPPDATA",
   "ProgramFiles",
   "PROGRAMFILES",
   "ProgramW6432",
@@ -338,6 +340,8 @@ describe("loadDotEnv", () => {
           [
             "ComSpec=.\\evil-comspec",
             "COMSPEC=.\\evil-comspec-upper",
+            "LocalAppData=.\\evil-local-app-data",
+            "LOCALAPPDATA=.\\evil-local-app-data-upper",
             "ProgramFiles=.\\evil-pfiles",
             "PROGRAMFILES=.\\evil-pfiles-upper",
             "ProgramW6432=.\\evil-pw6432",
@@ -715,6 +719,7 @@ describe("workspace .env blocklist completeness", () => {
           "HOMEBREW_BREW_FILE",
           "HOMEBREW_PREFIX",
           "IRC_HOST",
+          "LOCALAPPDATA",
           "MATTERMOST_URL",
           "MATRIX_HOMESERVER",
           "MINIMAX_API_HOST",
diff --git a/src/infra/dotenv.ts b/src/infra/dotenv.ts
index d3ac84122b2..9bdb55277e1 100644
--- a/src/infra/dotenv.ts
+++ b/src/infra/dotenv.ts
@@ -29,6 +29,7 @@ const BLOCKED_WORKSPACE_DOTENV_KEYS = new Set([
   "HOMEBREW_BREW_FILE",
   "HOMEBREW_PREFIX",
   "IRC_HOST",
+  "LOCALAPPDATA",
   "MATTERMOST_URL",
   "MATRIX_HOMESERVER",
   "MINIMAX_API_HOST",
diff --git a/src/infra/update-global.test.ts b/src/infra/update-global.test.ts
index 73d44192b0f..fdd3b25f53d 100644
--- a/src/infra/update-global.test.ts
+++ b/src/infra/update-global.test.ts
@@ -150,6 +150,50 @@ describe("update global helpers", () => {
     });
   });
 
+  it("resolves portable Git paths from process-local app data only", async () => {
+    const platformSpy = vi.spyOn(process, "platform", "get").mockReturnValue("win32");
+    try {
+      await withTempDir({ prefix: "openclaw-update-portable-git-" }, async (base) => {
+        envSnapshot = captureEnv(["LOCALAPPDATA"]);
+        const injectedLocalAppData = path.join(base, "injected-local-app-data");
+        const trustedLocalAppData = path.join(base, "trusted-local-app-data");
+        const injectedGitDir = path.join(
+          injectedLocalAppData,
+          "OpenClaw",
+          "deps",
+          "portable-git",
+          "cmd",
+        );
+        const trustedGitDir = path.join(
+          trustedLocalAppData,
+          "OpenClaw",
+          "deps",
+          "portable-git",
+          "cmd",
+        );
+        await fs.mkdir(injectedGitDir, { recursive: true });
+        await fs.mkdir(trustedGitDir, { recursive: true });
+
+        delete process.env.LOCALAPPDATA;
+        const injectedOnlyEnv = await createGlobalInstallEnv({
+          LOCALAPPDATA: injectedLocalAppData,
+          PATH: "base-bin",
+        });
+        expect(injectedOnlyEnv?.PATH).not.toContain(injectedGitDir);
+
+        process.env.LOCALAPPDATA = trustedLocalAppData;
+        const trustedEnv = await createGlobalInstallEnv({
+          LOCALAPPDATA: injectedLocalAppData,
+          PATH: "base-bin",
+        });
+        expect(trustedEnv?.PATH).toContain(trustedGitDir);
+        expect(trustedEnv?.PATH).not.toContain(injectedGitDir);
+      });
+    } finally {
+      platformSpy.mockRestore();
+    }
+  });
+
   it("classifies main and raw install specs separately from registry selectors", () => {
     expect(isMainPackageTarget("main")).toBe(true);
     expect(isMainPackageTarget(" MAIN ")).toBe(true);
diff --git a/src/infra/update-global.ts b/src/infra/update-global.ts
index 88f910c2f55..a80017f062e 100644
--- a/src/infra/update-global.ts
+++ b/src/infra/update-global.ts
@@ -274,13 +274,11 @@ export function canResolveRegistryVersionForPackageTarget(value: string): boolea
   return !isMainPackageTarget(trimmed) && !isExplicitPackageInstallSpec(trimmed);
 }
 
-async function resolvePortableGitPathPrepend(
-  env: NodeJS.ProcessEnv | undefined,
-): Promise<string[]> {
+async function resolvePortableGitPathPrepend(): Promise<string[]> {
   if (process.platform !== "win32") {
     return [];
   }
-  const localAppData = env?.LOCALAPPDATA?.trim() || process.env.LOCALAPPDATA?.trim();
+  const localAppData = process.env.LOCALAPPDATA?.trim();
   if (!localAppData) {
     return [];
   }
@@ -341,7 +339,7 @@ export function resolveGlobalInstallSpec(params: {
 export async function createGlobalInstallEnv(
   env?: NodeJS.ProcessEnv,
 ): Promise<NodeJS.ProcessEnv | undefined> {
-  const pathPrepend = await resolvePortableGitPathPrepend(env);
+  const pathPrepend = await resolvePortableGitPathPrepend();
   const sourceEnv = env ?? process.env;
   const hasCorepackDownloadPromptSetting = Boolean(
     sourceEnv.COREPACK_ENABLE_DOWNLOAD_PROMPT?.trim(),