CVE-2021-24135

WP Customer Reviews <= 3.4.2 - Multiple Stored Cross-Site Scripting

2020-08-20 00:00

Strategic Overview

Status: Patched in 3.4.3
Affected Plugin: WP Customer Reviews
Affected Version: <= 3.4.2
CVSS: 6.1Medium
Weakness type: CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE: CVE-2021-24135

View all WP Customer Reviews vulnerabilities

At a glance

CVE-2021-24135 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the WP Customer Reviews WordPress plugin, affecting versions <= 3.4.2. 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 3.4.3; sites on affected versions should update now. Disclosed August 2020, reported by Nguyen Anh Tien.

Vulnerability Overview

Unvalidated input and lack of output encoding in the WP Customer Reviews WordPress plugin, versions before 3.4.3, lead to multiple Stored Cross-Site Scripting vulnerabilities allowing remote attackers to inject arbitrary JavaScript code or HTML.

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 WP Customer Reviews <= 3.4.2 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 WP Customer Reviews the fix is 3.4.3: builds <= 3.4.2 are affected, anything from 3.4.3 onward is not.

Remediation

Update to version 3.4.3, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to WP Customer Reviews: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: WP Customer Reviews 3.4.3 closes this, and updating the plugin is the step that ends it.

Firewall
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2021-24135 https://www.wordfence.com/threat-intel/vulnerabilities/id/51e1a30e-774e-4478-be34-486ed4142a7d https://nvd.nist.gov/vuln/detail/CVE-2021-24135

Related records

Same weakness class

Other vulnerabilities in WP Customer Reviews

CVSS Vector

6.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionRequired
ScopeChanged
ConfidentialityLow
IntegrityLow
AvailabilityNone

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