gofiber/fiber · error

csrf: failed to store token in storage

Error message

csrf: failed to store token in storage: %w

What it means

Returned by createOrExtendTokenInStorage when storageManager.setRaw fails while writing or refreshing a CSRF token. The token issued to the client could not be persisted, so subsequent validation of that token will fail.

Solutions

1. Inspect the wrapped error to find the cause (capacity, network, permission).
2. Verify the Storage credentials have SET permission and the backend has capacity.
3. Confirm IdleTimeout and the backend's TTL support are compatible (the storage must honor expiration).
4. Decide fail policy: if token cannot be stored, the next request will fail CSRF — consider returning a clear error to the client rather than a silently-broken token.

Example fix

// before: surfacing the raw storage error to the client
if err := storageManager.setRaw(c, token, dummyValue, cfg.IdleTimeout); err != nil {
    return fmt.Errorf("csrf: failed to store token in storage: %w", err)
}

// after: log internally and return a clean 503 so the client retries
if err := storageManager.setRaw(c, token, dummyValue, cfg.IdleTimeout); err != nil {
    log.Error("csrf token store failed:", err)
    return c.Status(fiber.StatusServiceUnavailable).
        SendString("CSRF storage unavailable; please retry")
}

func validateCsrfWrite(ctx context.Context, s fiber.Storage) error {
    return s.SetWithContext(ctx, "__csrf_probe__", []byte("x"), time.Second)
}

if err := storageManager.setRaw(c, token, dummyValue, cfg.IdleTimeout); err != nil {
    log.Error("csrf token store failed:", err)
    return c.Status(fiber.StatusServiceUnavailable).
        SendString("CSRF storage unavailable; retry")
}

When it happens

Trigger: A new CSRF token is being created or an existing one refreshed (sliding IdleTimeout), and the Storage SetWithContext call errors. Happens on requests that mint/rotate tokens against a configured external Storage.

Common situations: Storage backend down or at capacity during token issuance; write timeout; quota exceeded; ACL missing SET permission; context cancellation; custom Storage impl returning an error on Set.

Related errors

• csrf: failed to delete token from storage
• csrf: failed to fetch token from storage
• csrf: failed to store key
• csrf: failed to delete key
• csrf: failed to get value from storage

AI-assisted analysis of gofiber/fiber@a105acad6c (2026-08-11). Data as JSON: /api/errors/61bc419d8118f4e0. Report an issue: GitHub.

Appendix: source

Thrown at middleware/csrf/csrf.go:286

func getRawFromStorage(c fiber.Ctx, token string, cfg *Config, sessionManager *sessionManager, storageManager *storageManager) ([]byte, error) {
	if cfg.Session != nil {
		return sessionManager.getRaw(c, token, dummyValue), nil
	}
	raw, err := storageManager.getRaw(c, token)
	if err != nil {
		return nil, fmt.Errorf("csrf: failed to fetch token from storage: %w", err)
	}
	return raw, nil
}

// createOrExtendTokenInStorage creates or extends the token in the storage
func createOrExtendTokenInStorage(c fiber.Ctx, token string, cfg *Config, sessionManager *sessionManager, storageManager *storageManager) error {
	if cfg.Session != nil {
		sessionManager.setRaw(c, token, dummyValue, cfg.IdleTimeout)
		return nil
	}
	if err := storageManager.setRaw(c, token, dummyValue, cfg.IdleTimeout); err != nil {
		return fmt.Errorf("csrf: failed to store token in storage: %w", err)
	}
	return nil
}

func deleteTokenFromStorage(c fiber.Ctx, token string, cfg *Config, sessionManager *sessionManager, storageManager *storageManager) error {
	if cfg.Session != nil {
		sessionManager.delRaw(c)
		return nil
	}
	if err := storageManager.delRaw(c, token); err != nil {
		return fmt.Errorf("csrf: failed to delete token from storage: %w", err)
	}
	return nil
}

// Update CSRF cookie
// if expireCookie is true, the cookie will expire immediately
func updateCSRFCookie(c fiber.Ctx, cfg *Config, token string) {

View on GitHub (pinned to a105acad6c)