CVE-2022-3840Public exploitNetwork attack vector

Administrator stored XSS via unescaped button style

Published Dec 26, 2022 · Updated Apr 14, 2025

Stored XSS in Login for Google Apps before 3.4.5 allows remote authenticated users to execute scripts through a crafted button-style setting. The Advanced Options handler stores the Login With Google Button Styles value without sanitizing it, and the login page renders that value without escaping. Administrator access is required, and a browser triggers the stored payload when a user visits the WordPress login interface, including on multisite sites without unfiltered_html.

CVSS severity4.8
Medium
EPSS probability0.53%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Stored XSS in Login for Google Apps before 3.4.5 allows remote authenticated users to execute scripts through a crafted button-style setting. The Advanced Options handler stores the Login With Google Button Styles value without sanitizing it, and the login page renders that value without escaping. Administrator access is required, and a browser triggers the stored payload when a user visits the WordPress login interface, including on multisite sites without unfiltered_html.

The record

CVE
CVE-2022-3840
Published
Dec 26, 2022
Updated
Apr 14, 2025
Vendor
LionSher Technologies
Product
Login for Google Apps
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Dec 26, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 14, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <3.4.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

LionSher Technologies · Login for Google Appsversion=0 <3.4.5

Published CVSS scores

4.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo