For the second time this week a WordPress plugin has been found vulnerable, this time allowing an attacker to gain administrative privileges in plugin Convert Plus.

Convert Plus, which has 100,000 active installs, is a commercial lead generation tool containing a critical-rated "unauthenticated administrator creation" flaw, according to Wordfence. If exploited, the flaw allows an attacker to create and register new accounts with various privilege levels up to administrator.

Those using Convert Plus version 3.4.2 need to immediately update to version 3.4.3, Wordfence said.

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