CVE-2021-24811

Shop Page WP <= 1.2.7 - Authenticated Cross-Site Scripting

2021-11-01 00:00

Strategic Overview

Status: Patched in 1.2.8
Affected Plugin: Shop Page WP
Affected Version: < 1.2.8
CVSS: 4.8Medium
Weakness type: CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE: CVE-2021-24811

At a glance

CVE-2021-24811 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the Shop Page WP WordPress plugin, affecting versions < 1.2.8. It carries a CVSS score of 4.8 (reachable over the network; low attack complexity). Exploitation requires an authenticated account. The issue is fixed in version 1.2.8; sites on affected versions should update now. Disclosed November 2021, reported by Kévin Mosbahi (Mika).

Vulnerability Overview

The Shop Page WP WordPress plugin for WordPress is vulnerable to Cross-Site Scripting in versions up to, and including, 1.2.7 due to insufficient input sanitization and output escaping. This allows high privilege users to perform Cross-Site Scripting attacks even when the unfiltered_html capability is disallowed

Technical Analysis

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

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

Reaching this weakness in Shop Page WP < 1.2.8 takes any authenticated account. 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 Shop Page WP the fix is 1.2.8: builds < 1.2.8 are affected, anything from 1.2.8 onward is not.

Remediation

Update to version 1.2.8, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to Shop Page WP: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Shop Page WP 1.2.8 closes this, and updating the plugin is the step that ends it.

Firewall
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2021-24811 https://www.wordfence.com/threat-intel/vulnerabilities/id/a9ed9a77-5a51-4664-a8a5-579824f8eae7 https://nvd.nist.gov/vuln/detail/CVE-2021-24811

CVSS Vector

4.8

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

Base

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

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