CVSS base score
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
What the vulnerability does
The Blocksy Companion plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'tagName' Block Attribute (blocksy/dynamic-data) in all versions up to, and including, 2.1.51 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with author-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
Explanation of Vulnerability in Simple Terms
Blocksy Companion versions up to 2.1.51 contain a cross-site scripting vulnerability that allows authenticated users to inject malicious scripts. The vulnerability has changed scope, meaning injected code can affect other users and site functionality beyond the vulnerable component. An attacker with low-level site access can execute this attack without user interaction.
What an attacker can do
Inject malicious JavaScript that runs in other users' browsers and affects site functionality.
Potential impact on your site
Authenticated users can inject scripts affecting other visitors and site operations; data theft or malware distribution possible.
Conditions required to exploit
Attacker must have a low-privilege account on the site (e.g., subscriber or contributor role).
Key dates
External resources
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