CVE-2023-39310

Fusion Builder <= 3.11.1 - Missing Authorization

2023-08-10 00:00

Strategic Overview

Status: Patched in 3.11.2
Affected Plugin: Avada (Fusion) Builder
Affected Version: <= 3.11.1
CVSS: 4.3Medium
Weakness type: CWE-862 · Missing Authorization
CVE: CVE-2023-39310

View all Avada (Fusion) Builder vulnerabilities

At a glance

CVE-2023-39310 is a medium-severity Missing Authorization vulnerability in the Avada (Fusion) Builder WordPress plugin, affecting versions <= 3.11.1. It carries a CVSS score of 4.3 (reachable over the network; low attack complexity). The root cause is a missing authorization check on a reachable function. The issue is fixed in version 3.11.2; sites on affected versions should update now. Disclosed August 2023, reported by Rafie Muhammad.

Vulnerability Overview

The Fusion Builder plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on an unknown function in versions up to, and including, 3.11.1. This makes it possible for authenticated attackers, with subscriber-level access and above, to save Portfolio Permalinks.

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-862: Missing Authorization

Reaching this weakness in Avada (Fusion) Builder <= 3.11.1 takes a caller who can reach the endpoint. A missing authorization check means a function is reachable by anyone who can reach the endpoint, because the code never asks whether the caller is allowed to perform the action.

Any user who can reach the endpoint gets to run an action reserved for higher-privileged roles, from reading protected data to changing settings or content. For Avada (Fusion) Builder the fix is 3.11.2: builds <= 3.11.1 are affected, anything from 3.11.2 onward is not.

Remediation

Update to version 3.11.2, or a newer patched version

How does WordSec protect against this?

Because it turns on account access, WordSec's login security is the relevant layer: role-based two-factor, captcha and brute-force limits raise the cost of getting the account this needs. None of that substitutes for the fix: Avada (Fusion) Builder 3.11.2 closes this, and updating the plugin is the step that ends it.

Login Security
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2023-39310 https://www.wordfence.com/threat-intel/vulnerabilities/id/35b3a82a-4391-41b0-b434-691743c5ff4d https://nvd.nist.gov/vuln/detail/CVE-2023-39310

Related records

Same weakness class

Other vulnerabilities in Avada (Fusion) Builder

CVSS Vector

4.3

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

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredLow
User InteractionNone
ScopeUnchanged
ConfidentialityNone
IntegrityLow
AvailabilityNone

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