Acronis Warns: cPanel Backup Plugin Flaw Now Exploited in the Wild

Emily Davis · 2026-09-16

### A Wake-Up Call for Web Hosts If you're running a web server with cPanel or WHM, you need to pay close attention. Acronis just dropped a warning about a serious security hole in its Backup plugin. And here's the kicker: attackers are already using it in real attacks. This isn't some theoretical vulnerability that might get exploited someday. It's happening right now. So if you're managing servers, especially in a shared hosting environment, this one deserves your immediate attention. ### What Exactly Is CVE-2026-87886? The flaw is tracked as CVE-2026-87886 and has a CVSS score of 7.8. That's high severity, folks. In plain English, it's a local privilege escalation bug caused by insecure file permissions. What does that mean? An attacker who already has some access to your server can exploit this flaw to gain higher-level permissions. Think of it like this: someone sneaks into the lobby of your building, and because a door wasn't locked properly, they can now walk right into the executive offices. > "Privilege escalation is often the difference between a minor breach and a full-blown disaster." – Unknown ### Who's Affected? The vulnerability affects the Acronis Backup plugin for cPanel & WHM on Linux. If you're using this plugin on your servers, you're in the crosshairs. It doesn't matter if you're a small hosting provider or a large enterprise—if you've got this plugin installed, you need to act. ### Why This Matters More Than You Think cPanel and WHM are incredibly popular control panels. They power millions of websites worldwide. When a plugin used by so many hosting environments has a privilege escalation flaw, the ripple effects can be massive. Attackers love these kinds of bugs because they can quietly move from a low-privilege account to root access. Once they have root, they can: - Steal sensitive data, including customer information and backups - Install backdoors for persistent access - Launch further attacks from your server - Disable security measures and cover their tracks And because it's a local privilege escalation, it often flies under the radar of traditional security tools. ### What Should You Do Right Now? First, don't panic. But do take action. Here's a quick checklist: - **Check if you're running the affected plugin.** Log into your WHM and look at your installed plugins. If Acronis Backup is there, you're potentially vulnerable. - **Update immediately.** Acronis has likely released a patch. Apply it as soon as possible. If there's no patch yet, consider disabling the plugin until one is available. - **Review your file permissions.** Since the flaw is due to insecure file permissions, audit your server's permissions. Make sure critical files aren't world-writable or accessible by unauthorized users. - **Monitor for suspicious activity.** Look for unusual login attempts, new user accounts, or unexpected changes to system files. - **Consider a security audit.** If you're not sure whether you've been compromised, bring in a professional. It's better to be safe than sorry. ### The Bigger Picture: Why Antidetect Browsers Matter You might be wondering what this has to do with antidetect browsers. Well, in the world of cybersecurity, attackers often use antidetect browsers to manage multiple compromised accounts without being detected. They can mask their fingerprints and avoid triggering security alerts. So while you're patching your servers, it's also worth understanding how these tools work. The best antidetect browser solutions are used by both security professionals and malicious actors. Knowing the landscape helps you defend against it. ### Final Thoughts Security is a moving target. Just when you think you're safe, a new vulnerability pops up. The Acronis cPanel plugin flaw is a reminder that we can't get complacent. Patch early, patch often, and always keep an eye on your server's health. Stay safe out there.