diff --git a/src/renderer/src/i18n/locales/en.json b/src/renderer/src/i18n/locales/en.json
index ab43728ae84..e93cb0da7c1 100644
--- a/src/renderer/src/i18n/locales/en.json
+++ b/src/renderer/src/i18n/locales/en.json
@@ -788,7 +788,9 @@
               "undecryptableAppBoundMixed": "Orca cannot decrypt {{value0}} of this browser's cookies because they use app-bound encryption; {{value1}} more could not be decrypted for another reason. You can import cookies from a file using “From File…”.",
               "undecryptableKeyring": "{{value0}} cookies could not be decrypted because the system keyring was unavailable. Unlock your login keyring (or install a Secret Service provider such as gnome-keyring) and import again.",
               "undecryptableKeyringMixed": "{{value0}} cookies could not be decrypted because the system keyring was unavailable; {{value1}} more could not be decrypted for another reason. Unlock your login keyring (or install a Secret Service provider such as gnome-keyring) and import again.",
-              "undecryptableUnknown": "{{value0}} cookies could not be decrypted and were skipped. Close the source browser completely and try the import again."
+              "undecryptableUnknown": "{{value0}} cookies could not be decrypted and were skipped. Close the source browser completely and try the import again.",
+              "unrecognizedWarning": "The cookie import finished with a warning this version of Orca does not recognize. Update Orca to see the details, then check this profile before relying on its cookies.",
+              "undecryptableUnrecognizedReason": "{{value0}} cookies could not be decrypted and were skipped for a reason this version of Orca does not recognize. Update Orca to see the details, then try the import again."
             }
           }
         }
diff --git a/src/renderer/src/lib/browser-cookie-import-toast.test.ts b/src/renderer/src/lib/browser-cookie-import-toast.test.ts
index 23e04c53034..05858a32fd8 100644
--- a/src/renderer/src/lib/browser-cookie-import-toast.test.ts
+++ b/src/renderer/src/lib/browser-cookie-import-toast.test.ts
@@ -101,6 +101,46 @@ describe('emitBrowserCookieImportToast', () => {
     expect(warningToastMock).not.toHaveBeenCalled()
   })
 
+  // Why: the summary crosses the runtime RPC wire and is cast, not decoded, so a newer host can
+  // publish a reason/code this client build has never heard of (#14683 follow-up).
+  it('still warns when a newer host sends an undeclared undecryptable reason', () => {
+    emitBrowserCookieImportToast(
+      {
+        ...summary,
+        warning: {
+          code: 'cookies-undecryptable',
+          failedCookies: 3,
+          reason: 'hardware-token-required'
+        } as unknown as BrowserCookieImportSummary['warning']
+      },
+      'Imported 0 cookies.',
+      'Remote Linux'
+    )
+
+    const message = warningToastMock.mock.calls[0]?.[0]
+    expect(typeof message).toBe('string')
+    expect(message).not.toBe('')
+    expect(message).toContain('3')
+  })
+
+  it('still warns when a newer host sends an undeclared warning code', () => {
+    emitBrowserCookieImportToast(
+      {
+        ...summary,
+        warning: {
+          code: 'profile-locked',
+          failedCookies: 3
+        } as unknown as BrowserCookieImportSummary['warning']
+      },
+      'Imported 0 cookies.',
+      'Remote Linux'
+    )
+
+    const message = warningToastMock.mock.calls[0]?.[0]
+    expect(typeof message).toBe('string')
+    expect(message).not.toBe('')
+  })
+
   it('keeps both applicable warnings when restart fallback is unavailable', () => {
     emitBrowserCookieImportToast(
       {
diff --git a/src/renderer/src/lib/browser-cookie-import-toast.ts b/src/renderer/src/lib/browser-cookie-import-toast.ts
index a8fa4aa6bae..8918aa8a125 100644
--- a/src/renderer/src/lib/browser-cookie-import-toast.ts
+++ b/src/renderer/src/lib/browser-cookie-import-toast.ts
@@ -3,8 +3,39 @@ import type { BrowserCookieImportSummary } from '../../../shared/browser-workspa
 import { translate } from '@/i18n/i18n'
 
 type CookieImportWarning = NonNullable<BrowserCookieImportSummary['warning']>
+type CookieImportWarningCode = CookieImportWarning['code']
+type UndecryptableReason = Extract<CookieImportWarning, { code: 'cookies-undecryptable' }>['reason']
+
+// Why: the summary is cast, not decoded, on the way off the runtime RPC wire, so a newer host can
+// send a code/reason this build has never heard of. The Record keys are the union itself, so a new
+// member fails typecheck here instead of silently falling out of the switch (#14683 follow-up).
+const HANDLED_WARNING_CODES: Record<CookieImportWarningCode, true> = {
+  'restart-fallback-unavailable': true,
+  'cookies-undecryptable': true
+}
+
+const HANDLED_UNDECRYPTABLE_REASONS: Record<UndecryptableReason, true> = {
+  'app-bound-encryption': true,
+  'linux-keyring-unavailable': true,
+  unknown: true
+}
+
+function isHandledWarningCode(code: string): code is CookieImportWarningCode {
+  return Object.hasOwn(HANDLED_WARNING_CODES, code)
+}
+
+function isHandledUndecryptableReason(reason: string): reason is UndecryptableReason {
+  return Object.hasOwn(HANDLED_UNDECRYPTABLE_REASONS, reason)
+}
 
 function formatCookieImportWarning(warning: CookieImportWarning): string {
+  const code: string = warning.code
+  if (!isHandledWarningCode(code)) {
+    return translate(
+      'auto.lib.browser.cookie.import.toast.unrecognizedWarning',
+      'The cookie import finished with a warning this version of Orca does not recognize. Update Orca to see the details, then check this profile before relying on its cookies.'
+    )
+  }
   switch (warning.code) {
     case 'restart-fallback-unavailable':
       return warning.loadedCookies === 0
@@ -21,7 +52,15 @@ function formatCookieImportWarning(warning: CookieImportWarning): string {
               value1: warning.loadedCookies + warning.failedCookies
             }
           )
-    case 'cookies-undecryptable':
+    case 'cookies-undecryptable': {
+      const reason: string = warning.reason
+      if (!isHandledUndecryptableReason(reason)) {
+        return translate(
+          'auto.lib.browser.cookie.import.toast.undecryptableUnrecognizedReason',
+          '{{value0}} cookies could not be decrypted and were skipped for a reason this version of Orca does not recognize. Update Orca to see the details, then try the import again.',
+          { value0: warning.failedCookies }
+        )
+      }
       switch (warning.reason) {
         case 'app-bound-encryption':
           return warning.otherFailedCookies
@@ -54,6 +93,7 @@ function formatCookieImportWarning(warning: CookieImportWarning): string {
             { value0: warning.failedCookies }
           )
       }
+    }
   }
 }