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 theme for WordPress is vulnerable to Stored Cross-Site Scripting via the className parameter in the About Me block in all versions up to, and including, 2.0.39 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor 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 versions up to 2.0.39 contain an input validation flaw that allows authenticated users with low privileges to read sensitive data or modify site content across different security contexts. The vulnerability requires a valid user account but no special permissions. The scope is changed, meaning the impact extends beyond the vulnerable component itself.
What an attacker can do
Read sensitive data or modify site content with a low-privilege user account.
Potential impact on your site
Authenticated users can access or alter data they should not be able to reach, potentially exposing private information or corrupting site content.
Conditions required to exploit
Attacker must have a valid low-privilege user account; no user interaction required.
Key dates
External resources
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