WordPress Sites Can Be Hacked While Installing a Security Patch

Robert Moore · 2026-11-06

You'd think installing a security update would lock things down. But for some WordPress sites, the act of patching actually opens a brief window where attackers can slip in. That's the unsettling finding from Umut Bayram, a researcher at Picus Security who discovered an actively exploited flaw. Here's the kicker: the update that installs the fix still unpacks its files using the site's old, unpatched code. So if an attacker strikes at just the right moment — while the update is being applied — they can run code on your server. It's like changing the locks while the door is still wide open. ### Why the Patch Itself Is Risky Most of us treat updates as a pure win: click install, and you're safer. But this flaw flips that logic. The update process itself becomes a vulnerability because it relies on the very code it's trying to replace. Attackers who know about the flaw can time their attack to coincide with the update, catching your site in a moment of weakness. Bayram's advice? Block web access to the site during the update. That way, even if the old code is still running, no one from the outside can reach it. It's a simple but effective workaround — like closing the blinds while you rearrange the furniture. ### What This Means for Antidetect Browser Users If you're using an antidetect browser to manage multiple WordPress sites, this is a wake-up call. Many of us rely on these tools to juggle dozens of sites without getting flagged. But when a security patch drops, the last thing you want is to be locked out or exposed. - **Time your updates carefully.** Avoid applying patches during peak traffic hours when attackers might be more active. - **Use a maintenance mode.** Most security plugins offer a way to temporarily block access — use it. - **Keep backups.** If something goes wrong, you'll want a clean restore point. > "The update that installs the fix still unpacks its files using the site's old, unpatched code, so an attacker who strikes at the right moment can run code on the server." — Umut Bayram, Picus Security ### The Bigger Picture This isn't just about WordPress. It's a reminder that security is never binary — there's no "safe" state you reach and stay in forever. Every update, every plugin install, every configuration change is a potential window. The best antidetect browser in the world won't save you if you ignore the fundamentals. So next time you hit that update button, take a breath. Close the door first. Then patch. Your sites — and your peace of mind — will thank you.