diff --git a/extensions/elevenlabs/realtime-transcription-provider.ts b/extensions/elevenlabs/realtime-transcription-provider.ts
index 9f918396c2ab..07ee3d6b73f2 100644
--- a/extensions/elevenlabs/realtime-transcription-provider.ts
+++ b/extensions/elevenlabs/realtime-transcription-provider.ts
@@ -14,7 +14,7 @@ import {
   parseFiniteNumber as readFiniteNumber,
 } from "openclaw/plugin-sdk/string-coerce-runtime";
 import { resolveElevenLabsApiKeyWithProfileFallback } from "./config-api.js";
-import { normalizeElevenLabsBaseUrl } from "./shared.js";
+import { normalizeElevenLabsRealtimeBaseUrl } from "./shared.js";
 
 type ElevenLabsRealtimeTranscriptionProviderConfig = {
   apiKey?: string;
@@ -130,12 +130,6 @@ function normalizeProviderConfig(
   };
 }
 
-function normalizeElevenLabsRealtimeBaseUrl(value?: string): string {
-  const url = new URL(normalizeElevenLabsBaseUrl(value));
-  url.protocol = url.protocol === "http:" ? "ws:" : "wss:";
-  return url.toString().replace(/\/+$/, "");
-}
-
 function toElevenLabsRealtimeWsUrl(config: ElevenLabsRealtimeTranscriptionSessionConfig): string {
   const url = new URL(
     `${normalizeElevenLabsRealtimeBaseUrl(config.baseUrl)}/v1/speech-to-text/realtime`,
@@ -277,7 +271,7 @@ export function buildElevenLabsRealtimeTranscriptionProvider(): RealtimeTranscri
       return createElevenLabsRealtimeTranscriptionSession({
         ...req,
         apiKey,
-        baseUrl: normalizeElevenLabsBaseUrl(config.baseUrl),
+        baseUrl: normalizeElevenLabsRealtimeBaseUrl(config.baseUrl),
         modelId: config.modelId ?? ELEVENLABS_REALTIME_DEFAULT_MODEL,
         audioFormat: config.audioFormat ?? ELEVENLABS_REALTIME_DEFAULT_AUDIO_FORMAT,
         sampleRate: config.sampleRate ?? ELEVENLABS_REALTIME_DEFAULT_SAMPLE_RATE,
diff --git a/extensions/elevenlabs/shared.test.ts b/extensions/elevenlabs/shared.test.ts
new file mode 100644
index 000000000000..e60c03e105d3
--- /dev/null
+++ b/extensions/elevenlabs/shared.test.ts
@@ -0,0 +1,77 @@
+import { describe, expect, it } from "vitest";
+import {
+  DEFAULT_ELEVENLABS_BASE_URL,
+  normalizeElevenLabsBaseUrl,
+  normalizeElevenLabsRealtimeBaseUrl,
+} from "./shared.js";
+
+describe("normalizeElevenLabsBaseUrl", () => {
+  it("returns the default when the base URL is missing or blank", () => {
+    expect(normalizeElevenLabsBaseUrl(undefined)).toBe(DEFAULT_ELEVENLABS_BASE_URL);
+    expect(normalizeElevenLabsBaseUrl("   ")).toBe(DEFAULT_ELEVENLABS_BASE_URL);
+  });
+
+  it("trims and strips trailing slashes from a valid URL", () => {
+    expect(normalizeElevenLabsBaseUrl("  https://custom.example.com/  ")).toBe(
+      "https://custom.example.com",
+    );
+    expect(normalizeElevenLabsBaseUrl("http://localhost:8080")).toBe("http://localhost:8080");
+  });
+
+  it("rejects an explicit malformed override instead of silently retargeting", () => {
+    // An operator's explicit endpoint must not be swapped for the default; fail
+    // actionably here so the request cannot target an unintended host, and so a
+    // downstream `new URL(...)` never throws an opaque TypeError.
+    expect(() => normalizeElevenLabsBaseUrl("not a url")).toThrow(/Invalid ElevenLabs baseUrl/);
+    expect(() => normalizeElevenLabsBaseUrl("////")).toThrow(/Invalid ElevenLabs baseUrl/);
+  });
+
+  it("rejects a parseable but unsupported (non-HTTP(S)) scheme", () => {
+    // `new URL()` accepts ftp:/data:/custom schemes, but downstream fetch and
+    // WebSocket paths only support http(s) ElevenLabs endpoints.
+    expect(() => normalizeElevenLabsBaseUrl("ftp://files.example.com")).toThrow(
+      /unsupported scheme/,
+    );
+    expect(() => normalizeElevenLabsBaseUrl("data:text/plain,x")).toThrow(/unsupported scheme/);
+  });
+
+  it("does not leak URL credentials or sensitive query values in validation errors", () => {
+    // Rejection errors may reach logs/diagnostics; they must not echo userinfo
+    // or credential-bearing query parameters from the configured baseUrl.
+    const nonHttp = "ftp://user:sup3r-secret@files.example.com/x?api_key=leak-me";
+    expect(() => normalizeElevenLabsBaseUrl(nonHttp)).toThrow(/unsupported scheme/);
+    try {
+      normalizeElevenLabsBaseUrl(nonHttp);
+    } catch (error) {
+      const message = (error as Error).message;
+      expect(message).not.toContain("sup3r-secret");
+      expect(message).not.toContain("leak-me");
+      expect(message).not.toContain("api_key");
+    }
+    // A malformed value that embeds a token must not be echoed either.
+    const malformed = "http://:not a url token=abcd1234secret";
+    try {
+      normalizeElevenLabsBaseUrl(malformed);
+    } catch (error) {
+      expect((error as Error).message).not.toContain("abcd1234secret");
+    }
+  });
+
+  it("keeps every accepted result parseable as an http(s) URL", () => {
+    for (const input of ["https://ok.example.com/", "http://a.b:9000"]) {
+      const normalized = normalizeElevenLabsBaseUrl(input);
+      const url = new URL(normalized);
+      expect(["http:", "https:"]).toContain(url.protocol);
+    }
+  });
+
+  it("maps HTTP endpoints and preserves explicit WebSocket endpoints for realtime", () => {
+    expect(normalizeElevenLabsRealtimeBaseUrl("https://api.example.com/")).toBe(
+      "wss://api.example.com",
+    );
+    expect(normalizeElevenLabsRealtimeBaseUrl("wss://realtime.example.com/")).toBe(
+      "wss://realtime.example.com",
+    );
+    expect(normalizeElevenLabsRealtimeBaseUrl("ws://localhost:8080/")).toBe("ws://localhost:8080");
+  });
+});
diff --git a/extensions/elevenlabs/shared.ts b/extensions/elevenlabs/shared.ts
index 370e5844330b..839743b7a02e 100644
--- a/extensions/elevenlabs/shared.ts
+++ b/extensions/elevenlabs/shared.ts
@@ -5,7 +5,45 @@ export function isValidElevenLabsVoiceId(voiceId: string): boolean {
   return /^[a-zA-Z0-9]{10,40}$/.test(voiceId);
 }
 
-export function normalizeElevenLabsBaseUrl(baseUrl?: string): string {
+function normalizeElevenLabsBaseUrlWithProtocols(
+  baseUrl: string | undefined,
+  allowedProtocols: readonly string[],
+): string {
   const trimmed = baseUrl?.trim();
-  return trimmed?.replace(/\/+$/, "") || DEFAULT_ELEVENLABS_BASE_URL;
+  // Only an absent/blank value falls back to the default endpoint. An explicit
+  // custom endpoint is operator intent, so never silently retarget it.
+  if (!trimmed) {
+    return DEFAULT_ELEVENLABS_BASE_URL;
+  }
+  const normalized = trimmed.replace(/\/+$/, "");
+  let parsed: URL;
+  try {
+    parsed = new URL(normalized);
+  } catch {
+    // Do not interpolate the raw value: an explicit baseUrl may embed userinfo
+    // (https://user:token@host) or credential-bearing query params that would
+    // otherwise leak into logs/diagnostics via this error.
+    throw new Error("Invalid ElevenLabs baseUrl: value is not a valid URL");
+  }
+  if (!allowedProtocols.includes(parsed.protocol)) {
+    // Only the scheme is safe to surface; the rest of the URL may carry secrets.
+    throw new Error(
+      `Invalid ElevenLabs baseUrl: unsupported scheme "${parsed.protocol}" (expected ${allowedProtocols.join(" or ")})`,
+    );
+  }
+  return normalized;
+}
+
+export function normalizeElevenLabsBaseUrl(baseUrl?: string): string {
+  return normalizeElevenLabsBaseUrlWithProtocols(baseUrl, ["http:", "https:"]);
+}
+
+export function normalizeElevenLabsRealtimeBaseUrl(baseUrl?: string): string {
+  const url = new URL(
+    normalizeElevenLabsBaseUrlWithProtocols(baseUrl, ["http:", "https:", "ws:", "wss:"]),
+  );
+  if (url.protocol === "http:" || url.protocol === "https:") {
+    url.protocol = url.protocol === "http:" ? "ws:" : "wss:";
+  }
+  return url.toString().replace(/\/+$/, "");
 }