diff --git a/tests/ui-testing/ci-matrix/ci_matrix_regression.json b/tests/ui-testing/ci-matrix/ci_matrix_regression.json
index 634671f70d..0393e0f395 100644
--- a/tests/ui-testing/ci-matrix/ci_matrix_regression.json
+++ b/tests/ui-testing/ci-matrix/ci_matrix_regression.json
@@ -128,6 +128,7 @@
       "landing-regression.spec.js",
       "internal-route-guards.spec.js",
       "datetime-paste-invalid-values-14648.spec.js",
+      "iam-users-15546-edit-dialog-cancel.spec.js",
       "query-management-sql-tooltip.spec.js"
     ],
     "disabled": []
diff --git a/tests/ui-testing/pages/iamPages/iamFormValidationPage.js b/tests/ui-testing/pages/iamPages/iamFormValidationPage.js
index 15d37774eb..d1567ac062 100644
--- a/tests/ui-testing/pages/iamPages/iamFormValidationPage.js
+++ b/tests/ui-testing/pages/iamPages/iamFormValidationPage.js
@@ -355,6 +355,12 @@ export class IamFormValidationPage {
         return this.page.locator(this.editBasicUserFirstBtn).count();
     }
 
+    async clickFirstEditUserButton() {
+        await this.page.locator(this.editBasicUserFirstBtn).first().click();
+    }
+
+    getUrlWithUserActionPattern() { return /[?&]action=(update|add)\b|[?&]email=/; }
+
     async navigateToUsersTab() {
         await this.navigateToIam();
         const tab = this.page.locator(this.iamUsersTab);
diff --git a/tests/ui-testing/playwright-tests/RegressionSet/General/iam-users-15546-edit-dialog-cancel.spec.js b/tests/ui-testing/playwright-tests/RegressionSet/General/iam-users-15546-edit-dialog-cancel.spec.js
new file mode 100644
index 0000000000..0f59bda2b9
--- /dev/null
+++ b/tests/ui-testing/playwright-tests/RegressionSet/General/iam-users-15546-edit-dialog-cancel.spec.js
@@ -0,0 +1,48 @@
+const { test, expect, navigateToBase } = require('../../utils/enhanced-baseFixtures.js');
+const testLogger = require('../../utils/test-logger.js');
+const PageManager = require('../../../pages/page-manager.js');
+
+test.describe("IAM Users edit dialog cancel Regression", () => {
+  let pm;
+
+  test.beforeEach(async ({ page }, testInfo) => {
+    testLogger.testStart(testInfo.title, testInfo.file);
+    await navigateToBase(page);
+    pm = new PageManager(page);
+    await pm.iamFormValidation.navigateToUsersTab();
+  });
+
+  test("cancelled edit dialog stays closed and leaves no action in the URL @bug-15546 @P3 @regression @iamUsers", async ({ page }) => {
+    const iam = pm.iamFormValidation;
+
+    await iam.openUpdateRoleDialogForFirstUser();
+    await expect(page).toHaveURL(/action=update/);
+
+    await iam.getUpdateRoleCancelBtnLocator().click();
+    await expect(iam.getUpdateRoleDialogLocator()).toBeHidden();
+    await expect(page).not.toHaveURL(iam.getUrlWithUserActionPattern());
+
+    // Outlast the dialog's 100ms open timer so a late reopen is caught.
+    await page.waitForTimeout(2000);
+    await expect(iam.getUpdateRoleDialogLocator()).toBeHidden();
+    testLogger.info('Edit dialog stayed closed and URL is clean after Cancel');
+  });
+
+  test("edit dialog cancelled during a slow roles load does not reopen @bug-15546 @P3 @regression @iamUsers", async ({ page }) => {
+    const iam = pm.iamFormValidation;
+    await page.route(/\/api\/[^/]+\/users\/roles(\?.*)?$/, async (route) => {
+      await new Promise((r) => setTimeout(r, 3000));
+      await route.continue();
+    });
+
+    await page.reload();
+    await iam.clickFirstEditUserButton();
+    await expect(iam.getUpdateRoleDialogLocator()).toBeVisible();
+    await iam.getUpdateRoleCancelBtnLocator().click();
+    await expect(iam.getUpdateRoleDialogLocator()).toBeHidden();
+
+    await page.waitForTimeout(4500);
+    await expect(iam.getUpdateRoleDialogLocator()).toBeHidden();
+    await expect(page).not.toHaveURL(iam.getUrlWithUserActionPattern());
+  });
+});
diff --git a/web/src/components/iam/users/User.spec.ts b/web/src/components/iam/users/User.spec.ts
index 1159cdc78f..bc1e9afeb2 100644
--- a/web/src/components/iam/users/User.spec.ts
+++ b/web/src/components/iam/users/User.spec.ts
@@ -1051,6 +1051,62 @@ describe("User Component", () => {
     });
   });
 
+  describe("AddUser dialog dismissal (#15546)", () => {
+    it("clears action/email from the URL when the dialog is cancelled", async () => {
+      const replaceSpy = vi.spyOn(router, "replace").mockImplementation(() => Promise.resolve());
+      wrapper.vm.showAddUserDialog = true;
+      await flushPromises();
+
+      wrapper.findComponent(AddUserStub).vm.$emit("update:open", false);
+      await flushPromises();
+
+      expect(wrapper.vm.showAddUserDialog).toBe(false);
+      expect(replaceSpy).toHaveBeenCalledWith({
+        name: "users",
+        query: { org_identifier: store.state.selectedOrganization.identifier },
+      });
+      replaceSpy.mockRestore();
+    });
+
+    it("drops a pending open timer when the form is hidden", async () => {
+      const replaceSpy = vi.spyOn(router, "replace").mockImplementation(() => Promise.resolve());
+      wrapper.vm.addUser({ row: { email: "test@example.com" } }, true);
+      wrapper.vm.hideForm();
+      await new Promise((r) => setTimeout(r, 150));
+
+      expect(wrapper.vm.showAddUserDialog).toBe(false);
+      replaceSpy.mockRestore();
+    });
+
+    it("does not reopen the edit dialog when it was cancelled while the page was still loading", async () => {
+      sharedUsersState.users = [];
+      queryClient.clear();
+      let resolveRoles: (v: any) => void = () => {};
+      mockUsersService.getRoles.mockReturnValue(new Promise((r) => (resolveRoles = r)) as any);
+      await router.push({
+        name: "users",
+        query: {
+          action: "update",
+          email: "test@example.com",
+          org_identifier: store.state.selectedOrganization.identifier,
+        },
+      });
+      const late = mountUser();
+      await flushPromises();
+
+      late.findComponent(AddUserStub).vm.$emit("update:open", false);
+      await flushPromises();
+      expect(router.currentRoute.value.query.action).toBeUndefined();
+
+      resolveRoles({ data: [{ label: "admin", value: "admin" }] });
+      await flushPromises();
+      await new Promise((r) => setTimeout(r, 150));
+
+      expect((late.vm as any).showAddUserDialog).toBe(false);
+      late.unmount();
+    });
+  });
+
   describe("hideForm", () => {
     it("should hide add user dialog and navigate", () => {
       const replaceSpy = vi.spyOn(router, "replace").mockImplementation(() => Promise.resolve());
diff --git a/web/src/components/iam/users/User.vue b/web/src/components/iam/users/User.vue
index e1fd207579..d5487ff897 100644
--- a/web/src/components/iam/users/User.vue
+++ b/web/src/components/iam/users/User.vue
@@ -283,7 +283,8 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
     />
 
     <AddUser
-      v-model:open="showAddUserDialog"
+      :open="showAddUserDialog"
+      @update:open="onAddUserOpenChange"
       v-model="selectedUser"
       :isUpdated="isUpdated"
       :userRole="currentUserRole"
@@ -1117,6 +1118,8 @@ export default defineComponent({
       showUpdateUserDialog.value = true;
     };
 
+    let openAddUserTimer: ReturnType<typeof setTimeout> | undefined;
+
     const addUser = (props: any, is_updated: boolean) => {
       isUpdated.value = is_updated;
       selectedUser.value.organization = store.state.selectedOrganization.identifier;
@@ -1133,7 +1136,8 @@ export default defineComponent({
       } else {
         selectedUser.value = {};
       }
-      setTimeout(() => {
+      clearTimeout(openAddUserTimer);
+      openAddUserTimer = setTimeout(() => {
         showAddUserDialog.value = true;
       }, 100);
     };
@@ -1227,6 +1231,7 @@ export default defineComponent({
     };
 
     const hideForm = () => {
+      clearTimeout(openAddUserTimer);
       showAddUserDialog.value = false;
       router.replace({
         name: "users",
@@ -1236,6 +1241,11 @@ export default defineComponent({
       });
     };
 
+    const onAddUserOpenChange = (open: boolean) => {
+      if (open) showAddUserDialog.value = true;
+      else hideForm();
+    };
+
     const addMember = async (res: any, data: any, operationType: string) => {
       showAddUserDialog.value = false;
       if (res.code == 200) {
@@ -1576,6 +1586,7 @@ export default defineComponent({
       addRoutePush,
       addMember,
       hideForm,
+      onAddUserOpenChange,
       isUpdated,
       showAddUserDialog,
       selectedUser,