diff --git a/.changeset/fix-content-authors-wiring.md b/.changeset/fix-content-authors-wiring.md
new file mode 100644
index 0000000000..159766b1e0
--- /dev/null
+++ b/.changeset/fix-content-authors-wiring.md
@@ -0,0 +1,5 @@
+---
+"emdash": patch
+---
+
+Fixes the admin author filter returning HTTP 500 (`NOT_CONFIGURED` / "EmDash is not initialized") for every collection. The `handleContentAuthors` handler was never exposed on the per-request `locals.emdash` object in middleware, so `GET /_emdash/api/content/{collection}/authors` always tripped its not-initialized guard while sibling content routes worked normally.
diff --git a/packages/core/src/astro/middleware.ts b/packages/core/src/astro/middleware.ts
index 06bb3b36b3..b76ee4d09c 100644
--- a/packages/core/src/astro/middleware.ts
+++ b/packages/core/src/astro/middleware.ts
@@ -591,6 +591,7 @@ export const onRequest = defineMiddleware(async (context, next) => {
 					// Content handlers
 					handleContentList: runtime.handleContentList.bind(runtime),
 					handleContentGet: runtime.handleContentGet.bind(runtime),
+					handleContentAuthors: runtime.handleContentAuthors.bind(runtime),
 					handleContentCreate: runtime.handleContentCreate.bind(runtime),
 					handleContentUpdate: runtime.handleContentUpdate.bind(runtime),
 					handleContentDelete: runtime.handleContentDelete.bind(runtime),
diff --git a/packages/core/tests/unit/astro/middleware-prerender.test.ts b/packages/core/tests/unit/astro/middleware-prerender.test.ts
index d58ed8cd44..b16470b07c 100644
--- a/packages/core/tests/unit/astro/middleware-prerender.test.ts
+++ b/packages/core/tests/unit/astro/middleware-prerender.test.ts
@@ -38,6 +38,7 @@ const {
 			configuredPlugins: [],
 			handleContentList: ok,
 			handleContentGet: ok,
+			handleContentAuthors: ok,
 			handleContentCreate: ok,
 			handleContentUpdate: ok,
 			handleContentDelete: ok,
@@ -232,6 +233,10 @@ describe("astro middleware prerendered routes", () => {
 		const emdash = locals.emdash as Record<string, unknown>;
 		expect(typeof emdash.handlePluginApiRoute).toBe("function");
 		expect(typeof emdash.handlePublicPluginApiRoute).toBe("function");
+		// Regression for #1462: the author filter route reads
+		// `locals.emdash.handleContentAuthors`; it must be wired onto the
+		// runtime helpers object or every `/authors` request 500s.
+		expect(typeof emdash.handleContentAuthors).toBe("function");
 	});
 
 	it("does not access context.session when prerendering public pages", async () => {