Installing the Fix for an Exploited WordPress Flaw Can Expose Some Sites One Last Time
WordPress sites can be attacked during the installation of a security fix for an exploited flaw.
A race condition vulnerability has been discovered in WordPress that allows attackers to exploit sites even while they are installing a security update. The issue arises because the update process unpacks files using the old, unpatched code, creating a window of opportunity for attackers to execute arbitrary code on the server. The researcher recommends blocking web access to the site during the update process to mitigate this risk.
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The lesson from this incident
Full lessonA race condition in WordPress's update mechanism means that sites can be exploited during the very moment they are installing a security fix, because the server temporarily unpacks and runs old, vulnerable code before the patched version is fully in place. This matters because it undermines the fundamental assumption that applying a patch immediately reduces risk — in this case, the patching process itself creates a brief but real attack window. Attackers who are actively monitoring targeted sites for update activity could time their exploit precisely to coincide with this window. The incident highlights that the patching process itself must be treated as a security-sensitive operation, not just a routine maintenance task.
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