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The OptinMonster plugin is affected by a high-severity flaw that enables unauthorized API entry and delicate data disclosure on roughly one million WordPress websites.
Tracked as CVE-2021-39341, the flaw was found by researcher Chloe Chamberland on September 28, 2021, with a patch turning into obtainable on October 7, 2021.
All customers of the OptinMonster plugin are suggested to improve to model 2.6.5 or later, as all earlier variations are affected.
API hassle
OptinMonster is without doubt one of the hottest WordPress plugins used to create lovely opt-in types that assist web site homeowners convert guests to subscribers/clients.
It’s primarily a lead generator and monetization software, and due to its ease of use and abundance of options, it is deployed on roughly one million websites.
As Chamberland explains in her vulnerability disclosure report, OptinMonster’s energy depends upon API endpoints that permit seamless integration and a streamlined design course of.
Nevertheless, the implementation of those endpoints isn’t at all times safe, and probably the most essential instance issues the ‘/wp-json/omapp/v1/help’ endpoint.
This endpoint can disclose knowledge akin to the positioning’s full path on the server, API keys used for requests on the positioning, and extra.
An attacker holding the API key may make adjustments on the OptinMonster accounts and even plant malicious JavaScript snippets on the positioning.
The positioning would execute this code each time an OptinMonster component was activated by a customer with out anybody’s data.
To make issues worse, the attacker wouldn’t even need to authenticate on the focused web site to entry the API endpoint, as an HTTP request would bypass safety checks below sure, simple to satisfy circumstances.
A request to the weak API endpointSource: Wordfence
Whereas the case of the ‘/wp-json/omapp/v1/help’ endpoint is the more serious, it is not the one insecure REST-API endpoint weak to exploitation.
After the researcher’s report reached the OptinMonster group, the builders of the favored WordPress plugin realized that all the API wanted revisiting.
As such, you need to set up any OptinMonster updates that land in your WordPress dashboard over the next weeks, as these will doubtless tackle extra API flaws.
Within the meantime, all API keys that might have been stolen had been invalidated instantly, and web site homeowners had been pressured to generate new keys.
This case highlights that even extensively deployed and very in style WordPress plugins can carry a number of undiscovered flaws for intensive intervals.
In case you are a web site proprietor, attempt to use the minimal variety of plugins to cowl the mandatory performance and value and apply plugin updates as quickly as doable.
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