CVE-2021-23150

AMP for WP – Accelerated Mobile Pages <= 1.0.77.31 - Authenticated (Admin+) Stored Cross-Site Scripting

2021-12-11 00:00
Tien Nguyen Ahn

Strategic Overview

Status
Patched in 1.0.77.32
Affected Plugin
AMP for WP – Accelerated Mobile Pages
Affected Version
<= 1.0.77.31
CVSS
5.5Medium
Weakness type
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE
CVE-2021-23150
View all AMP for WP – Accelerated Mobile Pages vulnerabilities

At a glance

CVE-2021-23150 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the AMP for WP WordPress plugin, affecting versions <= 1.0.77.31. It carries a CVSS score of 5.5 (reachable over the network; low attack complexity). Exploitation requires an authenticated account at Admin level or above. The issue is fixed in version 1.0.77.32; sites on affected versions should update now. Disclosed December 2021, reported by Tien Nguyen Ahn.

Vulnerability Overview

Authenticated (admin or higher user role) Stored Cross-Site Scripting (XSS) vulnerability discovered in AMP for WP – Accelerated Mobile Pages WordPress plugin (versions <= 1.0.77.31).

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 interaction from a victim user.

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

Reaching this weakness in AMP for WP <= 1.0.77.31 takes an account at Admin level or above. 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 AMP for WP the fix is 1.0.77.32: builds <= 1.0.77.31 are affected, anything from 1.0.77.32 onward is not.

Remediation

Update to version 1.0.77.32, or a newer patched version

How does WordSec protect against this?

An attacker needs Admin access first, so the firewall sees the attempt as traffic from a logged-in account: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: AMP for WP 1.0.77.32 closes this, and updating the plugin is the step that ends it.

  • Firewall
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2021-23150https://www.wordfence.com/threat-intel/vulnerabilities/id/095bee95-d3a7-4203-96eb-90f1f0eab84fhttps://nvd.nist.gov/vuln/detail/CVE-2021-23150

Related records

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