Password management service LastPass recently encountered significant user login issues after enforcing multifactor authentication (MFA) resets, beginning in early May. The company initially informed customers about planned security enhancements that necessitated a login reset and an adjustment to their multifactor authentication preference. In an attempt to boost account protection, LastPass increased the number of password iterations to a new default of 600,000 rounds. This substantial escalation in iteration count is designed to bolster the security of the master password, rendering it exceedingly challenging for cyber attackers to discover the correct master password. For understanding, the Password-Based Key Derivation Function (PBKDF2) is a ‘password-strengthening algorithm’ that makes it challenging for a computer to authenticate any one password as the correct master password during a compromising attack. The detailed procedure required to reset the pairing between LastPass and the authenticator app is described extensively in their support documents.

Post Implementation Issues

However, the implementation of these upgrades has had an unintended side effect. Numerous users have found themselves locked out of their accounts and unable to access their LastPass vaults, even after successfully resetting their MFA applications like LastPass Authenticator, Microsoft Authenticator, and Google Authenticator. The situation has become even more complicated as users are unable to seek help from support due to login requirements, leaving them trapped in a cycle of MFA resets. In response to the issues, LastPass has released multiple advisories regarding the security upgrades, explaining that these upgrades are designed to enhance password security. However, the enforcement of MFA resets has caused some users to lose access to their accounts entirely.

Steps to Reset the Authentication Method

LastPass outlined the entire resetting process on a support page with the following steps: Log in to LastPass and activate the Continue button. LastPass then sends a six-digit security code to the linked email address. Enter the received code as part of the process, then select Verify to proceed. Open the authenticator application on the mobile device. Scan the QR code displayed in the browser using the application to pair it, deleting the old information if necessary. Click Verify. Log in to LastPass and authenticate with the multifactor authentication app. A crucial detail omitted from the above steps is the verification of the device and location. A second email sent to users requests this verification. Failure to follow the link in that email and verify the device and location seems to hinder a successful login.

User Concerns and Feedback

Users of the platform have voiced their concerns on social media and the LastPass Support Discussions forum. They have reported being unable to access their vaults or open official support tickets since these actions require user sign-in, leaving them locked in reset loops. LastPass has attempted to assure users that the changes are being made for their security and to increase password iterations for better encryption of their LastPass vault.

Background of the Security Upgrades

The enforced security measures come after LastPass disclosed a security breach in December 2022. Threat actors had stolen a large volume of partially encrypted customer information and password vault data. This attack followed an earlier breach from August 2022, in which attackers had accessed the company’s encrypted Amazon S3 buckets using stolen data. Following these incidents, LastPass sent an email and in-product communications to customers, advising them to reset their MFA secrets with their preferred Authenticator App as a precautionary measure. However, despite the communications, despite the communications, a subset of customers has not taken the suggested action, resulting in the current situation. In early June, LastPass commenced an in-product prompt to encourage these customers to act, anticipating a more considered response than the emails had achieved. Nevertheless, many users are still struggling with the transition, sparking concern and conversation among the LastPass community.

The Silver Lining

Despite the issues encountered, it’s important to recognize that these security upgrades aim to prevent similar security breaches in the future. The increase in password iterations and enforcement of multifactor authentication are positive steps toward fortifying the protection of LastPass users’ data. The enhanced security will make it harder for attackers to decrypt stolen data, thus offering users improved peace of mind. The changes reflect LastPass’s commitment to staying ahead of evolving cybersecurity threats and delivering a secure service to its customers.

Looking Forward

LastPass is working tirelessly to resolve the login issues encountered by users as a result of the increased security measures. They are actively addressing the situation and encouraging their user base to understand the necessity of these changes despite the inconvenience caused. Moving forward, users are advised to remain vigilant and proactive about their account security, given the escalation in cybersecurity threats. The need for the recent security upgrades by LastPass underlines the importance of maintaining robust password hygiene and ensuring the protection of personal data. To avoid similar situations, LastPass customers should regularly update their accounts as per the company’s recommendations, ensuring they have the latest security enhancements. They should also follow the instructions in the emails sent by LastPass regarding the verification of their device and location, which is an important step in the new security protocol.


The experiences faced by LastPass users serve as a reminder of the fine balance required between improving security and maintaining user experience. As LastPass continues to resolve these issues, the incident highlights the constant, evolving struggle against cyber threats and the importance of proactive security measures for both companies and individuals alike.

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