diff --git a/CHANGELOG.md b/CHANGELOG.md
index fa6315648c4..5ff29b89bc9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,6 +13,7 @@ Docs: https://docs.openclaw.ai
 
 - Security/Sandbox media: restrict sandbox media tmp-path allowances to OpenClaw-managed tmp roots instead of broad host `os.tmpdir()` trust, and add outbound/channel guardrails (tmp-path lint + media-root smoke tests) to prevent regressions in local media attachment reads.
 - Config/Plugins: treat stale removed `google-antigravity-auth` plugin references as compatibility warnings (not hard validation errors) across `plugins.entries`, `plugins.allow`, `plugins.deny`, and `plugins.slots.memory`, so startup no longer fails after antigravity removal. (#25538, #25862) Thanks @chilu18.
+- Security/Message actions: enforce local media root checks for `sendAttachment` and `setGroupIcon` when `sandboxRoot` is unset, preventing attachment hydration from reading arbitrary host files via local absolute paths. This ships in the next npm release. Thanks @GCXWLP for reporting.
 - Security/Workspace FS: normalize `@`-prefixed paths before workspace-boundary checks (including workspace-only read/write/edit and sandbox mount path guards), preventing absolute-path escape attempts from bypassing guard validation. This ships in the next npm release. Thanks @tdjackey for reporting.
 - Security/Native images: enforce `tools.fs.workspaceOnly` for native prompt image auto-load (including history refs), preventing out-of-workspace sandbox mounts from being implicitly ingested as vision input. This ships in the next npm release. Thanks @tdjackey for reporting.
 - Security/Exec approvals: bind `system.run` command display/approval text to full argv when shell-wrapper inline payloads carry positional argv values, and reject payload-only `rawCommand` mismatches for those wrapper-carrier forms, preventing hidden command execution under misleading approval text. This ships in the next npm release. Thanks @tdjackey for reporting.
diff --git a/src/infra/outbound/message-action-params.ts b/src/infra/outbound/message-action-params.ts
index cf230e77417..e9672841e1c 100644
--- a/src/infra/outbound/message-action-params.ts
+++ b/src/infra/outbound/message-action-params.ts
@@ -178,6 +178,8 @@ async function hydrateAttachmentPayload(params: {
   contentTypeParam?: string | null;
   mediaHint?: string | null;
   fileHint?: string | null;
+  sandboxRoot?: string;
+  mediaLocalRoots?: readonly string[];
 }) {
   const contentTypeParam = params.contentTypeParam ?? undefined;
   const rawBuffer = readStringParam(params.args, "buffer", { trim: false });
@@ -201,12 +203,17 @@ async function hydrateAttachmentPayload(params: {
       channel: params.channel,
       accountId: params.accountId,
     });
-    // mediaSource already validated by normalizeSandboxMediaList; allow bypass but force explicit readFile.
-    const media = await loadWebMedia(mediaSource, {
-      maxBytes,
-      sandboxValidated: true,
-      readFile: (filePath: string) => fs.readFile(filePath),
-    });
+    const sandboxRoot = params.sandboxRoot?.trim();
+    const media = sandboxRoot
+      ? await loadWebMedia(mediaSource, {
+          maxBytes,
+          sandboxValidated: true,
+          readFile: (filePath: string) => fs.readFile(filePath),
+        })
+      : await loadWebMedia(mediaSource, {
+          maxBytes,
+          localRoots: params.mediaLocalRoots,
+        });
     params.args.buffer = media.buffer.toString("base64");
     if (!contentTypeParam && media.contentType) {
       params.args.contentType = media.contentType;
@@ -280,6 +287,8 @@ async function hydrateAttachmentActionPayload(params: {
   dryRun?: boolean;
   /** If caption is missing, copy message -> caption. */
   allowMessageCaptionFallback?: boolean;
+  sandboxRoot?: string;
+  mediaLocalRoots?: readonly string[];
 }): Promise<void> {
   const mediaHint = readStringParam(params.args, "media", { trim: false });
   const fileHint =
@@ -305,6 +314,8 @@ async function hydrateAttachmentActionPayload(params: {
     contentTypeParam,
     mediaHint,
     fileHint,
+    sandboxRoot: params.sandboxRoot,
+    mediaLocalRoots: params.mediaLocalRoots,
   });
 }
 
@@ -315,6 +326,8 @@ export async function hydrateSetGroupIconParams(params: {
   args: Record<string, unknown>;
   action: ChannelMessageActionName;
   dryRun?: boolean;
+  sandboxRoot?: string;
+  mediaLocalRoots?: readonly string[];
 }): Promise<void> {
   if (params.action !== "setGroupIcon") {
     return;
@@ -329,6 +342,8 @@ export async function hydrateSendAttachmentParams(params: {
   args: Record<string, unknown>;
   action: ChannelMessageActionName;
   dryRun?: boolean;
+  sandboxRoot?: string;
+  mediaLocalRoots?: readonly string[];
 }): Promise<void> {
   if (params.action !== "sendAttachment") {
     return;
diff --git a/src/infra/outbound/message-action-runner.test.ts b/src/infra/outbound/message-action-runner.test.ts
index 26591ff23c9..054350a4043 100644
--- a/src/infra/outbound/message-action-runner.test.ts
+++ b/src/infra/outbound/message-action-runner.test.ts
@@ -424,6 +424,15 @@ describe("runMessageAction context isolation", () => {
 });
 
 describe("runMessageAction sendAttachment hydration", () => {
+  const cfg = {
+    channels: {
+      bluebubbles: {
+        enabled: true,
+        serverUrl: "http://localhost:1234",
+        password: "test-password",
+      },
+    },
+  } as OpenClawConfig;
   const attachmentPlugin: ChannelPlugin = {
     id: "bluebubbles",
     meta: {
@@ -433,15 +442,15 @@ describe("runMessageAction sendAttachment hydration", () => {
       docsPath: "/channels/bluebubbles",
       blurb: "BlueBubbles test plugin.",
     },
-    capabilities: { chatTypes: ["direct"], media: true },
+    capabilities: { chatTypes: ["direct", "group"], media: true },
     config: {
       listAccountIds: () => ["default"],
       resolveAccount: () => ({ enabled: true }),
       isConfigured: () => true,
     },
     actions: {
-      listActions: () => ["sendAttachment"],
-      supportsAction: ({ action }) => action === "sendAttachment",
+      listActions: () => ["sendAttachment", "setGroupIcon"],
+      supportsAction: ({ action }) => action === "sendAttachment" || action === "setGroupIcon",
       handleAction: async ({ params }) =>
         jsonResult({
           ok: true,
@@ -476,17 +485,12 @@ describe("runMessageAction sendAttachment hydration", () => {
     vi.clearAllMocks();
   });
 
-  it("hydrates buffer and filename from media for sendAttachment", async () => {
-    const cfg = {
-      channels: {
-        bluebubbles: {
-          enabled: true,
-          serverUrl: "http://localhost:1234",
-          password: "test-password",
-        },
-      },
-    } as OpenClawConfig;
+  async function restoreRealMediaLoader() {
+    const actual = await vi.importActual<typeof import("../../web/media.js")>("../../web/media.js");
+    vi.mocked(loadWebMedia).mockImplementation(actual.loadWebMedia);
+  }
 
+  it("hydrates buffer and filename from media for sendAttachment", async () => {
     const result = await runMessageAction({
       cfg,
       action: "sendAttachment",
@@ -511,15 +515,6 @@ describe("runMessageAction sendAttachment hydration", () => {
   });
 
   it("rewrites sandboxed media paths for sendAttachment", async () => {
-    const cfg = {
-      channels: {
-        bluebubbles: {
-          enabled: true,
-          serverUrl: "http://localhost:1234",
-          password: "test-password",
-        },
-      },
-    } as OpenClawConfig;
     await withSandbox(async (sandboxDir) => {
       await runMessageAction({
         cfg,
@@ -537,6 +532,55 @@ describe("runMessageAction sendAttachment hydration", () => {
       expect(call?.[0]).toBe(path.join(sandboxDir, "data", "pic.png"));
     });
   });
+
+  it("rejects local absolute path for sendAttachment when sandboxRoot is missing", async () => {
+    await restoreRealMediaLoader();
+
+    const tempDir = await fs.mkdtemp(path.join(os.tmpdir(), "msg-attachment-"));
+    try {
+      const outsidePath = path.join(tempDir, "secret.txt");
+      await fs.writeFile(outsidePath, "secret", "utf8");
+
+      await expect(
+        runMessageAction({
+          cfg,
+          action: "sendAttachment",
+          params: {
+            channel: "bluebubbles",
+            target: "+15551234567",
+            media: outsidePath,
+            message: "caption",
+          },
+        }),
+      ).rejects.toThrow(/allowed directory|path-not-allowed/i);
+    } finally {
+      await fs.rm(tempDir, { recursive: true, force: true });
+    }
+  });
+
+  it("rejects local absolute path for setGroupIcon when sandboxRoot is missing", async () => {
+    await restoreRealMediaLoader();
+
+    const tempDir = await fs.mkdtemp(path.join(os.tmpdir(), "msg-group-icon-"));
+    try {
+      const outsidePath = path.join(tempDir, "secret.txt");
+      await fs.writeFile(outsidePath, "secret", "utf8");
+
+      await expect(
+        runMessageAction({
+          cfg,
+          action: "setGroupIcon",
+          params: {
+            channel: "bluebubbles",
+            target: "group:123",
+            media: outsidePath,
+          },
+        }),
+      ).rejects.toThrow(/allowed directory|path-not-allowed/i);
+    } finally {
+      await fs.rm(tempDir, { recursive: true, force: true });
+    }
+  });
 });
 
 describe("runMessageAction sandboxed media validation", () => {
diff --git a/src/infra/outbound/message-action-runner.ts b/src/infra/outbound/message-action-runner.ts
index 4095a4993d9..5031a2cdead 100644
--- a/src/infra/outbound/message-action-runner.ts
+++ b/src/infra/outbound/message-action-runner.ts
@@ -13,6 +13,7 @@ import type {
   ChannelThreadingToolContext,
 } from "../../channels/plugins/types.js";
 import type { OpenClawConfig } from "../../config/config.js";
+import { getAgentScopedMediaLocalRoots } from "../../media/local-roots.js";
 import {
   isDeliverableMessageChannel,
   normalizeMessageChannel,
@@ -757,6 +758,7 @@ export async function runMessageAction(
     params.accountId = accountId;
   }
   const dryRun = Boolean(input.dryRun ?? readBooleanParam(params, "dryRun"));
+  const mediaLocalRoots = getAgentScopedMediaLocalRoots(cfg, resolvedAgentId);
 
   await normalizeSandboxMediaParams({
     args: params,
@@ -770,6 +772,8 @@ export async function runMessageAction(
     args: params,
     action,
     dryRun,
+    sandboxRoot: input.sandboxRoot,
+    mediaLocalRoots,
   });
 
   await hydrateSetGroupIconParams({
@@ -779,6 +783,8 @@ export async function runMessageAction(
     args: params,
     action,
     dryRun,
+    sandboxRoot: input.sandboxRoot,
+    mediaLocalRoots,
   });
 
   const resolvedTarget = await resolveActionTarget({