Bit File Manager CVE-2024-7627: Unauthenticated RCE in a 20,000-Site WordPress Plugin

File manager plugins are among the most powerful tools you can install on a WordPress site — and, for exactly that reason, among the most dangerous when something goes wrong. In August 2024, security researchers disclosed a critical flaw in Bit File Manager, a popular free plugin used on more than 20,000 WordPress sites, that could allow an unauthenticated attacker to run arbitrary code on the server. Tracked as CVE-2024-7627, the vulnerability earned a CVSS score of 8.1 (High) and was fixed in version 6.5.6. If you use this plugin, this is one to take seriously.

CVE details at a glance

• CVE ID: CVE-2024-7627
• Plugin: Bit File Manager (formerly File Manager by Bit Apps)
• Vulnerability type: Unauthenticated Remote Code Execution (RCE) via a race condition
• CVSS score: 8.1 (High)
• Affected versions: 6.0 through 6.5.5
• Patched version: 6.5.6
• Active installations: 20,000+
• Disclosed: Reported July 2024, patch released August 21, 2024

How the vulnerability works

Bit File Manager includes a built-in code editor with a "check syntax" feature that lets users validate PHP code before saving it. Under the hood, that feature is handled by a function called checkSyntax. Two separate weaknesses combine to make it exploitable.

The first problem is a broken permission check. Access to the syntax-checking feature was gated by an if statement that relied on a faulty variable type comparison. Because of that flawed check, the feature could be reached by unauthenticated visitors in configurations where the administrator had granted the plugin’s "Guest User" read permissions — a setting some site owners enable to let visitors browse files.

The second problem is where the real danger lies. To check the syntax of submitted code, the plugin writes the code to a temporary file in a publicly accessible directory and only validates it afterward. For a brief window, that temporary file — which can contain attacker-supplied PHP — exists on disk in a location the attacker can reach through a web browser. This is a classic race condition: if the attacker can request that temporary file at exactly the right moment, before the plugin cleans it up, the server executes their PHP code.

Winning a race condition sounds difficult, but attackers automate it. By hammering the endpoint with rapid, repeated requests, an attacker only needs to get lucky once. The published proof-of-concept demonstrates exactly this technique, which is why the flaw was rated as a genuine remote code execution risk rather than a theoretical one.

Real-world impact

Remote code execution is the most severe class of web vulnerability because it hands the attacker the keys to the server, not just the website. Once arbitrary PHP runs on your host, an attacker can typically:

• Install a persistent backdoor or web shell to retain access even after the plugin is updated
• Create rogue administrator accounts and lock out legitimate owners
• Read your wp-config.php file and steal database credentials, then exfiltrate customer data
• Inject spam, malware, or SEO redirects that get your site blacklisted by Google
• Use your server as a launch point for attacks on other sites in the same hosting account

Because the exploit requires no login, no social engineering, and no user interaction, sites running a vulnerable version with guest read access were exposed to fully automated, internet-wide scanning. The one mitigating factor is configuration dependence: the attack path relies on the administrator having enabled Guest User read permissions. Sites that never granted guest access were not exploitable through this specific path — but relying on a configuration detail is no substitute for patching.

How to check if you’re affected

Work through these checks in order:

1. In your WordPress dashboard, go to Plugins → Installed Plugins and look for "Bit File Manager" (it may also appear as "File Manager" by Bit Apps).
2. Check the version number listed under the plugin name. If it is anywhere from 6.0 to 6.5.5, you are running a vulnerable release.
3. Review the plugin’s settings for any "Guest User" or public/anonymous access permissions. If guest read access is enabled, treat the site as actively at risk and prioritize the fix.
4. If you manage many sites, a vulnerability scanner such as Wordfence or Patchstack will flag CVE-2024-7627 automatically.

How to fix it

The fix is straightforward: update Bit File Manager to version 6.5.6 or later, which corrects both the permission check and the insecure temporary-file handling.

1. Go to Plugins → Installed Plugins, find Bit File Manager, and click Update Now. If your site uses automatic plugin updates, confirm the update actually applied by rechecking the version.
2. After updating, open the plugin’s permission settings and disable Guest User read access unless you have a specific, deliberate reason to keep it. Anonymous file access is rarely necessary and dramatically widens your attack surface.
3. Because this was an RCE flaw, assume compromise is possible if you ran a vulnerable version with guest access exposed. Scan for unfamiliar files in your uploads and plugin directories, review your administrator accounts for anything you don’t recognize, and check for unexpected scheduled tasks.
4. Consider whether you need a file manager plugin at all. If you only occasionally edit files, SFTP or your host’s file manager is safer than leaving a powerful, web-facing file tool installed year-round.

If you cannot update immediately, a web application firewall (WAF) can block exploitation attempts in the meantime — but a firewall rule is a stopgap, not a cure. Patching remains the only complete fix.

The takeaway

CVE-2024-7627 is a textbook example of why powerful convenience plugins deserve extra scrutiny. A file manager that can read, write, and execute code on your server is a high-value target, and a single flawed permission check turned a helpful tool into an unauthenticated RCE. The lessons generalize well beyond this one plugin: keep every plugin updated, disable anonymous or guest access unless you truly need it, remove tools you’re not actively using, and run a scanner so you learn about vulnerabilities before attackers exploit them. Good security hygiene isn’t about reacting to each new CVE — it’s about building habits that make the next one a non-event.