CVE-2026-39451

WP Google Review Slider <= 18.0 - Unauthenticated Stored Cross-Site Scripting

2026-06-01 00:00

Strategic Overview

Status: Patched in 18.1
Affected Plugin: WP Google Review Slider
Affected Version: <= 18.0
CVSS: 7.2High
Weakness type: CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE: CVE-2026-39451

View all WP Google Review Slider vulnerabilities

At a glance

CVE-2026-39451 is a high-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the WP Google Review Slider WordPress plugin, affecting versions <= 18.0. It carries a CVSS score of 7.2 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 18.1; sites on affected versions should update now. Disclosed June 2026, reported by hhhai.

Vulnerability Overview

The WP Google Review Slider plugin for WordPress is vulnerable to Stored Cross-Site Scripting in versions up to, and including, 18.0 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers 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 privileges on the target site, and no interaction from a victim user.

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

Reaching this weakness in WP Google Review Slider <= 18.0 takes no account at all. 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 WP Google Review Slider the fix is 18.1: builds <= 18.0 are affected, anything from 18.1 onward is not.

Remediation

Update to version 18.1, or a newer patched version

How does WordSec protect against this?

Requests carrying this pattern arrive without a session, so nothing upstream of the firewall gets a chance to reject them: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: WP Google Review Slider 18.1 closes this, and updating the plugin is the step that ends it.

Firewall
Login Security
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2026-39451 https://www.wordfence.com/threat-intel/vulnerabilities/id/37dc80d0-1834-40a7-9454-a8129d9b4cdd https://nvd.nist.gov/vuln/detail/CVE-2026-39451

Related records

Same weakness class

CVSS Vector

7.2

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

Base

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

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