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A maximum severity vulnerability that allows hackers to hijack GitLab accounts with no user interaction required is now under active exploitation, federal government officials warned as data showed that thousands of users had yet to install a patch released in January.

A change GitLab implemented in May 2023 made it possible for users to initiate password changes through links sent to secondary email addresses. The move was designed to permit resets when users didn’t have access to the email address used to establish the account. In January, GitLab disclosed that the feature allowed attackers to send reset emails to accounts they controlled and from there click on the embedded link and take over the account.

While exploits require no user interaction, hijackings work only against accounts that aren’t configured to use multifactor authentication. Even with MFA, accounts remained vulnerable to password resets, but the attackers ultimately are unable to access the account, allowing the rightful owner to change the reset password. The vulnerability, tracked as CVE-2023-7028, carries a severity rating of 10 out of 10.