One million WordPress sites at risk of attack

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Cybersecurity (opens in new tab) researchers have helped patch several vulnerabilities in an extremely popular WordPress plugin (opens in new tab), which could have been exploited by any visitor to undertake a number of actions against affected WordPress (opens in new tab) websites, such as exporting sensitive information.

The vulnerabilities, discovered by WordPress security (opens in new tab) experts Wordfence (opens in new tab), existed in the OptinMonster plugin that boasts of a user base of over a million websites.

OptinMonster helps create sales campaigns on WordPress websites (opens in new tab) without much effort.  through the use of dialogs. Wordfence explains that the vast majority of the plugin’s functionality as well as the OptinMonster app site rely on the use of API endpoints.

Open sesame

“Unfortunately, the majority of the REST-API endpoints were insecurely implemented, making it possible for unauthenticated attackers to access many of the various endpoints on sites running a vulnerable version of the plugin,” wrote (opens in new tab) Wordfence’s threat analyst Chloe Chamberland. 

In her run down of the vulnerabilities, Chamberland notes that one of the vulnerable endpoints could have been exploited to leak sensitive data like the site’s full path on the server, along with the API key the website uses to make requests on the OptinMonster site.

“With access to the API key, an attacker could make changes to any campaign associated with a site’s connected OptinMonster account and add malicious JavaScript (opens in new tab) that would execute anytime a campaign was displayed on the exploited site,” says Chamberland.

She notes that rather worryingly the vulnerability could have been exploited by any visitor to the website. 

Although there aren’t reports of the vulnerabilities being exploited in the wild, the plugin developer has invalidated all API keys, forcing users to generate new ones. They’ve also patched all vulnerabilities and made changes to how changes are made to the campaigns. 

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With almost two decades of writing and reporting on Linux, Mayank Sharma would like everyone to think he’s TechRadar Pro’s expert on the topic. Of course, he’s just as interested in other computing topics, particularly cybersecurity, cloud, containers, and coding.