It's been a tough couple of years for Okta (OKTA 1.11%) investors. After enduring the worst downturn in more than a decade, the cybersecurity specialist suffered a high-profile security breach in mid-2023. Growth slowed to a crawl, and confidence waned.However, Okta's quarterly results have vaulted the company back into Wall Street's good graces, and at least one analyst believes there's much more to come.A rare double upgradeIn the wake of the company's impressive financial results, Bank of America upgrade ...