As explained in a blog post, Bruandet, found a critical XSS flaw in the plugin that existed due to lack of capability checks in AJAX endpoint. In turn, it exposed the values autosave_contant_data and save_contentdata, enabling an attacker to conduct malicious activities. Specifically, exploiting save_contentdata could have let an adversary to pull published data offline, or entirely delete it. Whereas, exploiting autosave_contant_data could allow injecting malicious JavaScript codes to the site.
Alongside Bruandet, the team Wordfence has also reviewed this vulnerability after they noticed updates in the plugin. The flaw particularly caught their attention after the plugin was closed for review, as stated in their post. They have deemed the bug a critical severity flaw with a CVSS score of 9.0.
Consequently, the developers patched the vulnerability with the release of GDPR Cookie Consent v.1.8.3. Since the fix is out, users must ensure they update their plugin to the latest versions to prevent potential exploits.
GDPR Cookie Consent is a dedicated WordPress plugin that facilitates site admins in ensuring site compliance with GDPR.
Earlier this year, WordFence team also discovered vulnerabilities in other WordPress plugins that also threatened thousands of users. These vulnerable plugins include Code Snippets, WP Time Capsule, and InfiniteWP Client.
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