CVE-2021-39328 : Security Advisory and Response

WordPress plugin Simple Job Board <= 2.9.4 is vulnerable to Stored Cross-Site Scripting. Attackers with administrative access can inject arbitrary scripts.

Understanding CVE-2021-39328

Simple Job Board plugin versions up to and including 2.9.4 have a Stored Cross-Site Scripting vulnerability that allows attackers to execute arbitrary scripts.

What is CVE-2021-39328?

The Simple Job Board WordPress plugin has a security flaw that enables Stored Cross-Site Scripting due to inadequate escaping in a specific file, affecting versions 2.9.4 and below.

The Impact of CVE-2021-39328

This vulnerability allows attackers with administrative privileges to insert malicious scripts, particularly impacting multi-site setups where unfiltered_html is disabled for administrators.

Technical Details of CVE-2021-39328

Simple Job Board <= 2.9.4 has the following technical details:

Vulnerability Description

Insufficient escaping on the $job_board_privacy_policy_label variable in the ~/admin/settings/class-simple-job-board-settings-privacy.php file leads to Stored Cross-Site Scripting.

Affected Systems and Versions

Product: Simple Job Board
Vendor: Simple Job Board
Versions Affected: <= 2.9.4
Version Type: Custom

Exploitation Mechanism

Attack Complexity: Low
Attack Vector: Network
Privileges Required: High
User Interaction: None
Scope: Changed
CVSS Score: 5.5 (Medium)

Mitigation and Prevention

To address CVE-2021-39328, the following steps are recommended:

Immediate Steps to Take

Update the plugin to version 2.9.5 or newer to mitigate the vulnerability.

Long-Term Security Practices

Regularly monitor and update WordPress plugins to prevent security vulnerabilities.

Patching and Updates

Stay informed about security advisories and apply patches promptly to ensure system security.