CVE-2021-24830

Advanced Access Manager <= 6.7.9 - Admin+ Stored Cross-Site Scripting

2021-10-19 00:00

Strategic Overview

Status: Patched in 6.8.0
Affected Plugin: Advanced Access Manager – Access Governance for WordPress
Affected Version: < 6.8.0
CVSS: 4.8Medium
Weakness type: CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE: CVE-2021-24830

View all Advanced Access Manager – Access Governance for WordPress vulnerabilities

At a glance

CVE-2021-24830 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the Advanced Access Manager WordPress plugin, affecting versions < 6.8.0. It carries a CVSS score of 4.8 (reachable over the network; low attack complexity). The issue is fixed in version 6.8.0; sites on affected versions should update now. Disclosed October 2021, reported by Huy Nguyen.

Vulnerability Overview

The Advanced Access Manager WordPress plugin before 6.8.0 does not escape some of its settings when outputting them, allowing 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 Advanced Access Manager < 6.8.0 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 Advanced Access Manager the fix is 6.8.0: builds < 6.8.0 are affected, anything from 6.8.0 onward is not.

Remediation

Update to version 6.8.0, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to Advanced Access Manager: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Advanced Access Manager 6.8.0 closes this, and updating the plugin is the step that ends it.

Firewall
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2021-24830 https://www.wordfence.com/threat-intel/vulnerabilities/id/6f7e0aa7-8834-4ff1-9ced-5d740936c721 https://nvd.nist.gov/vuln/detail/CVE-2021-24830

Related records

Same weakness class

Other vulnerabilities in Advanced Access Manager – Access Governance for WordPress

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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