We can’t emphasize enough that you should not use the plugin Ultimate Member as the plugin has been riddled with security vulnerabilities including one that was widely exploited last year and was slow to be fixed, due to what appears to be a lack of interest by the developer in getting it secure. That lack of interest is particularly problematic due to the fact that the plugin has 100,000+ active installations according to wordpress.org. The latest vulnerability found in it is yet another reminder of that, as the developer attempted to fix a serious vulnerability, but used the wrong code, so there is still a vulnerability, though less easily exploited. The continuation of the vulnerability also involves a security failure in WordPress that was warned about back in February of 2011, but still hasn’t been resolved despite being continually being implicated in widely exploited vulnerabilities.
The situation is also is yet another reminder why actually checking out and testing out claimed fixed vulnerabilities is important, so you don’t incorrectly believe that an unfixed vulnerability that is more widely known about, since it has been noted to have been fixed, has been fixed. That is something we do, but clearly other data sources on WordPress plugin vulnerabilities competing with our service don’t do. [Read more]