Okta vulnerability enabled passwordless login for long usernames

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Critical Security Flaw Discovered in Okta’s Authentication System

In a recent security advisory, Okta disclosed a significant vulnerability in its authentication system that permitted unauthorized access to user accounts without the necessity of entering the correct password. This issue arose when an account had a username exceeding 52 characters. The flaw was linked to the system’s ability to bypass password authentication if it identified a “stored cache key” from a previous successful login. This means that the account owner had to have previously logged in using that particular browser. Importantly, organizations employing multi-factor authentication were not impacted by this vulnerability, as noted in the company’s notification to its clients.

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However, a username with 52 characters can be easier to guess than a complex password. In many cases, such usernames could be something as straightforward as a person’s email address, which often includes their full name along with their organization’s domain. Okta acknowledged that this vulnerability was introduced during a standard update released on July 23, 2024, and it only became aware of the issue on October 30, after which it was promptly fixed. Customers who may be affected by this vulnerability are advised to review their access logs from the past few months for any suspicious activity.

Okta is a leading provider of identity and access management solutions, enabling businesses to seamlessly integrate authentication services into their applications. For organizations managing multiple applications, Okta offers a consolidated login experience, allowing users to authenticate themselves only once instead of verifying their identity for each application separately. While the company has not disclosed whether any users have been compromised due to this specific issue, it has previously committed to improving its communication with clients following the breach of some accounts by the threat group Lapsus$.

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