CVE-2024-45429

Advanced Custom Fields <= 6.3.5 - Authenticated Stored Cross-Site Scripting

2024-09-04 00:00

Strategic Overview

Status: Patched in 6.3.6
Affected Plugin: Advanced Custom Fields Pro
Affected Version: <= 6.3.5
CVSS: 5.5Medium
Weakness type: CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE: CVE-2024-45429

View all Advanced Custom Fields Pro vulnerabilities

At a glance

CVE-2024-45429 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the Advanced Custom Fields Pro WordPress plugin, affecting versions <= 6.3.5. It carries a CVSS score of 5.5 (reachable over the network; low attack complexity). Exploitation requires an authenticated account. The issue is fixed in version 6.3.6; sites on affected versions should update now. Disclosed September 2024, reported by Ryo Sotoyama.

Vulnerability Overview

The Advanced Custom Fields plugin for WordPress is vulnerable to Stored Cross-Site Scripting via field groups in all versions up to, and including, 6.3.5 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with the 'capability' setting privilege, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

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')

Advanced Custom Fields Pro <= 6.3.5 carries this weakness at capability, and reaching it 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 Advanced Custom Fields Pro the fix is 6.3.6: builds <= 6.3.5 are affected, anything from 6.3.6 onward is not.

Remediation

Update to version 6.3.6, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to Advanced Custom Fields Pro: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Advanced Custom Fields Pro 6.3.6 closes this, and updating the plugin is the step that ends it.

Firewall
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2024-45429 https://www.wordfence.com/threat-intel/vulnerabilities/id/51178e18-ae8b-4a7f-974d-23346a8dbc52 https://nvd.nist.gov/vuln/detail/CVE-2024-45429

Related records

Same weakness class

Other vulnerabilities in Advanced Custom Fields Pro

CVSS Vector

5.5

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

Base

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

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