CVE-2021-24275

Popup by Supsystic <= 1.10.4 - Reflected Cross-Site Scripting

2021-04-19 00:00
0xB9

Strategic Overview

Status
Patched in 1.10.5
Affected Plugin
Customer Engagement System – Popup Builder, Forms, CRM & Email Marketing Automation
Affected Version
<= 1.10.4
CVSS
6.1Medium
Weakness type
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE
CVE-2021-24275
View all Customer Engagement System – Popup Builder, Forms, CRM & Email Marketing Automation vulnerabilities

At a glance

CVE-2021-24275 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the Customer Engagement System WordPress plugin, affecting versions <= 1.10.4. It carries a CVSS score of 6.1 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 1.10.5; sites on affected versions should update now. Disclosed April 2021, reported by 0xB9.

Vulnerability Overview

The Popup by Supsystic WordPress plugin before 1.10.5 did not sanitise the tab parameter of its options page before outputting it in an attribute, leading to a reflected Cross-Site Scripting issue

Technical Analysis

The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no privileges on the target site.

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Reaching this weakness in Customer Engagement System <= 1.10.4 takes a caller who can reach the endpoint. Cross-site scripting happens when input from a request is written into a page without being escaped for the context it lands in, so the browser parses attacker-supplied text as markup or script.

Injected script runs with the privileges of whoever views the affected page, which is how these flaws turn into administrator session theft, silent account creation or persistent backdoors in page content. For Customer Engagement System the fix is 1.10.5: builds <= 1.10.4 are affected, anything from 1.10.5 onward is not.

Remediation

Update to version 1.10.5, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to Customer Engagement System: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Customer Engagement System 1.10.5 closes this, and updating the plugin is the step that ends it.

  • Firewall
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2021-24275https://www.wordfence.com/threat-intel/vulnerabilities/id/0c1ebc88-0987-46d6-9e80-6f3aa50d10afhttps://nvd.nist.gov/vuln/detail/CVE-2021-24275

Related records

Vulnerability data © Defiant, Inc., provided under the Wordfence Intelligence T&C