diff --git a/packages/core/src/execution-engine/__tests__/routing-node.test.ts b/packages/core/src/execution-engine/__tests__/routing-node.test.ts
index f43ac27be45..ba27460b41b 100644
--- a/packages/core/src/execution-engine/__tests__/routing-node.test.ts
+++ b/packages/core/src/execution-engine/__tests__/routing-node.test.ts
@@ -2531,11 +2531,16 @@ describe('RoutingNode', () => {
 			position: [0, 0],
 		};
 
-		const buildNodeType = (): INodeType => {
+		// `null` means the node declares no base URL; a default parameter cannot express that,
+		// since an explicit `undefined` triggers the default.
+		const buildNodeType = (
+			baseURL: string | null = 'https://api.example.com',
+			routedUrl = 'https://other-host.example.com/path',
+		): INodeType => {
 			const routingNodeType = nodeTypes.getByNameAndVersion(baseNode.type);
 			routingNodeType.description = {
 				credentials: [{ name: 'testCredential', required: true }],
-				requestDefaults: { baseURL: 'https://api.example.com' },
+				requestDefaults: { baseURL: baseURL ?? undefined },
 				properties: [
 					{
 						displayName: 'Endpoint',
@@ -2544,7 +2549,7 @@ describe('RoutingNode', () => {
 						default: '',
 						routing: {
 							request: {
-								url: 'https://attacker.com/exfiltrate',
+								url: routedUrl,
 							},
 						},
 					},
@@ -2553,9 +2558,12 @@ describe('RoutingNode', () => {
 			return routingNodeType;
 		};
 
-		const runWithCredential = async (data: Record<string, unknown>) => {
+		const runWithCredential = async (
+			data: Record<string, unknown>,
+			options: { baseURL?: string | null; routedUrl?: string } = {},
+		) => {
 			const credentialData = data as unknown as ICredentialDataDecryptedObject;
-			const nodeType = buildNodeType();
+			const nodeType = buildNodeType(options.baseURL, options.routedUrl);
 			const workflow = new Workflow({
 				nodes: [baseNode],
 				connections: {},
@@ -2628,32 +2636,69 @@ describe('RoutingNode', () => {
 			expect(requestOptions.allowedDomains).toBeUndefined();
 		});
 
-		test("throws when mode is 'none'", async () => {
-			await expect(
-				runWithCredential({
-					apiKey: 'testApiKey',
-					allowedHttpRequestDomains: 'none',
-				}),
-			).rejects.toThrow('This credential is configured to prevent use within an HTTP Request node');
+		test("adds the node's own host when mode is 'domains' and the list omits it", async () => {
+			const result = await runWithCredential({
+				apiKey: 'testApiKey',
+				allowedHttpRequestDomains: 'domains',
+				allowedDomains: 'other.example.com',
+			});
+
+			const requestOptions = (result?.[0]?.[0]?.json as { requestOptions: IHttpRequestOptions })
+				.requestOptions;
+			expect(requestOptions.allowedDomains).toBe('api.example.com, other.example.com');
 		});
 
-		test("throws when mode is 'domains' but the list is empty", async () => {
-			await expect(
-				runWithCredential({
+		test.each([
+			['the node declares no base URL', null],
+			['the base URL resolves to an empty string', ''],
+		])('does not widen the allowlist from the routed URL when %s', async (_label, baseURL) => {
+			// The routed URL can interpolate a node parameter, so its host is the user's choice.
+			const result = await runWithCredential(
+				{
 					apiKey: 'testApiKey',
 					allowedHttpRequestDomains: 'domains',
-					allowedDomains: '   ',
-				}),
-			).rejects.toThrow('No allowed domains specified');
+					allowedDomains: 'other.example.com',
+				},
+				{ baseURL, routedUrl: 'https://user-chosen.example.net/path' },
+			);
+
+			const requestOptions = (result?.[0]?.[0]?.json as { requestOptions: IHttpRequestOptions })
+				.requestOptions;
+			expect(requestOptions.allowedDomains).toBe('other.example.com');
 		});
 
-		test("throws when mode is 'domains' but the list is missing", async () => {
-			await expect(
-				runWithCredential({
-					apiKey: 'testApiKey',
-					allowedHttpRequestDomains: 'domains',
-				}),
-			).rejects.toThrow('No allowed domains specified');
+		test("does not block a declarative node when mode is 'none'", async () => {
+			const result = await runWithCredential({
+				apiKey: 'testApiKey',
+				allowedHttpRequestDomains: 'none',
+			});
+
+			const requestOptions = (result?.[0]?.[0]?.json as { requestOptions: IHttpRequestOptions })
+				.requestOptions;
+			expect(requestOptions.allowedDomains).toBeUndefined();
+		});
+
+		test("falls back to the node's own host when the 'domains' list is empty", async () => {
+			const result = await runWithCredential({
+				apiKey: 'testApiKey',
+				allowedHttpRequestDomains: 'domains',
+				allowedDomains: '   ',
+			});
+
+			const requestOptions = (result?.[0]?.[0]?.json as { requestOptions: IHttpRequestOptions })
+				.requestOptions;
+			expect(requestOptions.allowedDomains).toBe('api.example.com');
+		});
+
+		test("falls back to the node's own host when the 'domains' list is missing", async () => {
+			const result = await runWithCredential({
+				apiKey: 'testApiKey',
+				allowedHttpRequestDomains: 'domains',
+			});
+
+			const requestOptions = (result?.[0]?.[0]?.json as { requestOptions: IHttpRequestOptions })
+				.requestOptions;
+			expect(requestOptions.allowedDomains).toBe('api.example.com');
 		});
 
 		test('does not set allowedDomains when restriction field is absent', async () => {
diff --git a/packages/core/src/execution-engine/routing-node.ts b/packages/core/src/execution-engine/routing-node.ts
index 1042a9673e9..3a976b6ff29 100644
--- a/packages/core/src/execution-engine/routing-node.ts
+++ b/packages/core/src/execution-engine/routing-node.ts
@@ -227,8 +227,16 @@ export class RoutingNode {
 				itemContext[itemIndex].requestData.options.timeout = 300_000;
 			}
 
+			// A declarative node's URL comes from its own routing, not from the user. Only
+			// `baseURL` is safe to widen the allowlist with: a per-operation `url` can
+			// interpolate a node parameter, and that host is the user's choice, not the node's.
 			const allowedDomains = credentials
-				? getCredentialAllowedDomains({ node, credentialData: credentials })
+				? getCredentialAllowedDomains({
+						node,
+						credentialData: credentials,
+						credentialOwnedSurface: true,
+						nodeEndpointUrl: itemContext[itemIndex].requestData.options.baseURL,
+					})
 				: undefined;
 			if (allowedDomains) {
 				itemContext[itemIndex].requestData.options.allowedDomains = allowedDomains;
diff --git a/packages/workflow/src/credential-domain-restrictions.ts b/packages/workflow/src/credential-domain-restrictions.ts
index f11a0299e18..8295bddba45 100644
--- a/packages/workflow/src/credential-domain-restrictions.ts
+++ b/packages/workflow/src/credential-domain-restrictions.ts
@@ -105,14 +105,7 @@ export function isDomainAllowed(options: { url: string; allowedDomains: string }
 		return true;
 	}
 
-	let url: URL;
-	try {
-		url = new URL(urlString);
-	} catch {
-		return false;
-	}
-
-	const hostname = url.hostname.toLowerCase().replace(/\.$/, '');
+	const hostname = toHostname(urlString);
 	if (!hostname) return false;
 
 	const allowedDomainsList = allowedDomains
@@ -148,6 +141,16 @@ function toDisplayHost(url: string): string {
 	}
 }
 
+/** Hostname of an absolute URL, normalised for matching. `undefined` when there is none. */
+function toHostname(url: string | undefined): string | undefined {
+	if (!url) return undefined;
+	try {
+		return new URL(url).hostname.toLowerCase().replace(/\.$/, '') || undefined;
+	} catch {
+		return undefined;
+	}
+}
+
 /** Throws `UserError` when `node` is omitted, so callers without an `INode` (axios helper) get a wrappable error. */
 export function assertUrlAllowed(options: {
 	url: string;
@@ -162,31 +165,61 @@ export function assertUrlAllowed(options: {
 	throw node ? new NodeOperationError(node, message) : new UserError(message);
 }
 
-/** Returns the allowlist for forwarding to per-hop redirect checks; `undefined` means allow-all. */
+/**
+ * Returns the allowlist for forwarding to per-hop redirect checks; `undefined` means allow-all.
+ *
+ * `'none'` blocks the caller outright, unless `credentialOwnedSurface` says the URL comes from
+ * a node definition rather than from the user — set that only for such callers, never for a
+ * URL that arrives as request input.
+ *
+ * On such a surface, pass `nodeEndpointUrl` and its host joins the `'domains'` allowlist, so a
+ * list the user wrote with the HTTP Request node in mind does not stop the credential working in
+ * the node it belongs to. A node that decides its endpoint later — in `preSend`, or in the
+ * credential's own `authenticate` — has no host to offer here and stays subject to the list.
+ */
 export function getCredentialAllowedDomains(options: {
 	node: INode;
 	credentialData: ICredentialDataDecryptedObject;
 	surface?: string;
+	credentialOwnedSurface?: boolean;
+	nodeEndpointUrl?: string;
 }): string | undefined {
-	const { node, credentialData, surface = DEFAULT_SURFACE } = options;
+	const {
+		node,
+		credentialData,
+		surface = DEFAULT_SURFACE,
+		credentialOwnedSurface,
+		nodeEndpointUrl,
+	} = options;
 	const mode = readMode(credentialData);
+	// Guarded on the flag: a surface where the user picks the URL must never widen its allowlist.
+	const endpointHost = credentialOwnedSurface ? toHostname(nodeEndpointUrl) : undefined;
+	// A comma is a legal host character and would split into extra allowlist entries.
+	const ownHost = endpointHost?.includes(',') ? undefined : endpointHost;
 
 	if (mode === 'none') {
-		throw new NodeOperationError(
-			node,
-			`This credential is configured to prevent use within an ${surface} node`,
-		);
+		if (!credentialOwnedSurface) {
+			throw new NodeOperationError(
+				node,
+				`This credential is configured to prevent use within an ${surface} node`,
+			);
+		}
+		return undefined;
 	}
 
 	if (mode === 'domains') {
 		const allowedDomains = readAllowedDomainsField(credentialData);
 		if (!allowedDomains) {
+			if (ownHost) return ownHost;
 			throw new NodeOperationError(
 				node,
 				'No allowed domains specified. Configure allowed domains or change restriction setting.',
 			);
 		}
-		return allowedDomains;
+		if (!ownHost || isDomainAllowed({ url: `https://${ownHost}`, allowedDomains })) {
+			return allowedDomains;
+		}
+		return `${ownHost}, ${allowedDomains}`;
 	}
 
 	return undefined;
diff --git a/packages/workflow/test/credential-domain-restrictions.test.ts b/packages/workflow/test/credential-domain-restrictions.test.ts
index 9212533e034..4a4b4d577af 100644
--- a/packages/workflow/test/credential-domain-restrictions.test.ts
+++ b/packages/workflow/test/credential-domain-restrictions.test.ts
@@ -278,6 +278,227 @@ describe('getCredentialAllowedDomains', () => {
 			}),
 		).toThrow('No allowed domains specified');
 	});
+
+	describe('credentialOwnedSurface', () => {
+		const noneCredential = { allowedHttpRequestDomains: 'none' };
+
+		it("adds the node's own host to a 'domains' allowlist that omits it", () => {
+			expect(
+				getCredentialAllowedDomains({
+					node,
+					credentialData: {
+						allowedHttpRequestDomains: 'domains',
+						allowedDomains: 'other.example.com',
+					},
+					credentialOwnedSurface: true,
+					nodeEndpointUrl: 'https://api.example.com/v2',
+				}),
+			).toBe('api.example.com, other.example.com');
+		});
+
+		it("does not duplicate the node's own host when the allowlist already covers it", () => {
+			expect(
+				getCredentialAllowedDomains({
+					node,
+					credentialData: {
+						allowedHttpRequestDomains: 'domains',
+						allowedDomains: 'other.example.com, API.Example.com',
+					},
+					credentialOwnedSurface: true,
+					nodeEndpointUrl: 'https://api.example.com/v2',
+				}),
+			).toBe('other.example.com, API.Example.com');
+		});
+
+		it('strips the port from the node host it adds', () => {
+			expect(
+				getCredentialAllowedDomains({
+					node,
+					credentialData: {
+						allowedHttpRequestDomains: 'domains',
+						allowedDomains: 'other.example.com',
+					},
+					credentialOwnedSurface: true,
+					nodeEndpointUrl: 'https://api.example.com:8443/v2',
+				}),
+			).toBe('api.example.com, other.example.com');
+		});
+
+		it('does not add a host containing a comma, which would split the list', () => {
+			expect(
+				getCredentialAllowedDomains({
+					node,
+					credentialData: {
+						allowedHttpRequestDomains: 'domains',
+						allowedDomains: 'other.example.com',
+					},
+					credentialOwnedSurface: true,
+					nodeEndpointUrl: 'https://one,two.example.com/v2',
+				}),
+			).toBe('other.example.com');
+		});
+
+		it('treats a wildcard entry as already covering the node host', () => {
+			expect(
+				getCredentialAllowedDomains({
+					node,
+					credentialData: {
+						allowedHttpRequestDomains: 'domains',
+						allowedDomains: '*.example.com',
+					},
+					credentialOwnedSurface: true,
+					nodeEndpointUrl: 'https://api.example.com/v2',
+				}),
+			).toBe('*.example.com');
+		});
+
+		it("falls back to the node's own host when the 'domains' list is empty", () => {
+			expect(
+				getCredentialAllowedDomains({
+					node,
+					credentialData: { allowedHttpRequestDomains: 'domains', allowedDomains: '   ' },
+					credentialOwnedSurface: true,
+					nodeEndpointUrl: 'https://api.example.com/v2',
+				}),
+			).toBe('api.example.com');
+		});
+
+		it("still rejects an empty 'domains' list when there is no node host to fall back on", () => {
+			expect(() =>
+				getCredentialAllowedDomains({
+					node,
+					credentialData: { allowedHttpRequestDomains: 'domains', allowedDomains: '' },
+					credentialOwnedSurface: true,
+				}),
+			).toThrow('No allowed domains specified');
+		});
+
+		it.each([
+			['explicitly false', false],
+			['undefined', undefined],
+		])(
+			'never widens the allowlist when credentialOwnedSurface is %s',
+			(_label, credentialOwnedSurface) => {
+				expect(
+					getCredentialAllowedDomains({
+						node,
+						credentialData: {
+							allowedHttpRequestDomains: 'domains',
+							allowedDomains: 'other.example.com',
+						},
+						credentialOwnedSurface,
+						nodeEndpointUrl: 'https://api.example.com/v2',
+					}),
+				).toBe('other.example.com');
+			},
+		);
+
+		it.each([
+			['an unresolved expression', '={{$credentials.baseUrl}}'],
+			['a relative path', '/api/v2'],
+			['a scheme with no host', 'https://'],
+			['an empty string', ''],
+			['undefined', undefined],
+		])('widens nothing when the node endpoint is %s', (_label, nodeEndpointUrl) => {
+			expect(
+				getCredentialAllowedDomains({
+					node,
+					credentialData: {
+						allowedHttpRequestDomains: 'domains',
+						allowedDomains: 'other.example.com',
+					},
+					credentialOwnedSurface: true,
+					nodeEndpointUrl,
+				}),
+			).toBe('other.example.com');
+		});
+
+		it("ignores nodeEndpointUrl for 'none'", () => {
+			expect(
+				getCredentialAllowedDomains({
+					node,
+					credentialData: { allowedHttpRequestDomains: 'none' },
+					credentialOwnedSurface: true,
+					nodeEndpointUrl: 'https://api.example.com/v2',
+				}),
+			).toBeUndefined();
+		});
+
+		it("ignores nodeEndpointUrl for 'all'", () => {
+			expect(
+				getCredentialAllowedDomains({
+					node,
+					credentialData: { allowedHttpRequestDomains: 'all' },
+					credentialOwnedSurface: true,
+					nodeEndpointUrl: 'https://api.example.com/v2',
+				}),
+			).toBeUndefined();
+		});
+
+		it("leaves 'none' unrestricted for a credential-owned surface", () => {
+			expect(
+				getCredentialAllowedDomains({
+					node,
+					credentialData: noneCredential,
+					credentialOwnedSurface: true,
+				}),
+			).toBeUndefined();
+		});
+
+		it.each([
+			['explicitly false', false],
+			['undefined', undefined],
+		])(
+			"still blocks 'none' when credentialOwnedSurface is %s",
+			(_label, credentialOwnedSurface) => {
+				expect(() =>
+					getCredentialAllowedDomains({
+						node,
+						credentialData: noneCredential,
+						credentialOwnedSurface,
+					}),
+				).toThrow('This credential is configured to prevent use within an HTTP Request node');
+			},
+		);
+
+		it("still blocks 'none' when the flag is omitted entirely", () => {
+			expect(() => getCredentialAllowedDomains({ node, credentialData: noneCredential })).toThrow(
+				'This credential is configured to prevent use within an HTTP Request node',
+			);
+		});
+
+		it("still enforces the 'domains' allowlist on a credential-owned surface", () => {
+			expect(
+				getCredentialAllowedDomains({
+					node,
+					credentialData: {
+						allowedHttpRequestDomains: 'domains',
+						allowedDomains: 'api.example.com',
+					},
+					credentialOwnedSurface: true,
+				}),
+			).toBe('api.example.com');
+		});
+
+		it("still rejects an empty 'domains' allowlist on a credential-owned surface", () => {
+			expect(() =>
+				getCredentialAllowedDomains({
+					node,
+					credentialData: { allowedHttpRequestDomains: 'domains', allowedDomains: '  ' },
+					credentialOwnedSurface: true,
+				}),
+			).toThrow('No allowed domains specified');
+		});
+
+		it.each([
+			["'all'", { allowedHttpRequestDomains: 'all' }],
+			['an absent mode', {}],
+		])('returns undefined for %s on a credential-owned surface', (_label, credentialData) => {
+			expect(
+				getCredentialAllowedDomains({ node, credentialData, credentialOwnedSurface: true }),
+			).toBeUndefined();
+		});
+	});
 });
 
 describe('assertUrlAllowed', () => {