A security flaw in popular WordPress software puts 100,000 sites at risk of information theft.
Security researchers have discovered a serious weakness in Gravity SMTP, a tool that helps WordPress websites send emails. The flaw, given the identifier CVE-2026-4020, allows people without permission to access sensitive information from affected websites. With roughly 100,000 WordPress sites running this plugin, the vulnerability represents a significant security concern across the web.
Think of this like a hotel keycard system where someone discovered they could copy a master key without needing special access. Attackers can exploit this weakness to peek behind the curtain at information they shouldn't see—data that website owners considered private and protected.
The vulnerability carries a medium-level severity rating, scored 5.3 on a standard security measurement scale. This means while it's not the most critical threat possible, it's still serious enough to warrant immediate attention. What makes this particular flaw especially problematic is that attackers don't need to be registered users or have any legitimate access to a website to exploit it. They can attack from the outside, like someone trying doors in a hallway until they find one that's unlocked.
Website administrators who use Gravity SMTP should understand that their email configuration, settings, and potentially sensitive data could be viewed by unauthorized visitors. This could include email addresses, server information, and other technical details that normally remain hidden.
If you operate a WordPress website, this matters directly. Your site could be vulnerable even if you've been diligent about other security practices. Email plugins handle sensitive infrastructure—they're the backbone of how your site communicates. When they're compromised, attackers gain valuable intelligence about your website's setup, which they could use to plan larger attacks.
For everyday internet users, this vulnerability could indirectly affect you. Websites you trust with your information—newsletters you subscribe to, services you use—may be running this vulnerable software. If their site gets hacked through this weakness, your information could be exposed.
The risk: Attackers can gather information about websites without permission, potentially leading to more serious security breaches down the line.
If you manage a WordPress site with Gravity SMTP installed, take these steps immediately:
If you're a regular website visitor with no technical responsibilities, keep an eye on security news from sites you use frequently. Many reputable WordPress hosts will automatically patch this for their users, but it never hurts to stay informed.
Staying secure online requires staying informed about threats and acting quickly when they emerge.
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