CVE-2022-21145Public exploitNetwork attack vector

Stored script execution via case-sensitive sanitizer bypass

Published Apr 14, 2022 · Updated Apr 15, 2025

Stored XSS in WebUserActions.aspx in Lansweeper 9.1.20.2 allows remote authenticated users to inject JavaScript via an HTTP request. WebUserActions.cs strips characters from the name parameter but compares it case-sensitively, so LoginMessage bypasses HTML sanitization before database storage. Exploitation requires permission to change login-layout fields; the stored script executes when a user visits the login page.

CVSS severity9.1
Critical
EPSS probability77.78%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in WebUserActions.aspx in Lansweeper 9.1.20.2 allows remote authenticated users to inject JavaScript via an HTTP request. WebUserActions.cs strips characters from the name parameter but compares it case-sensitively, so LoginMessage bypasses HTML sanitization before database storage. Exploitation requires permission to change login-layout fields; the stored script executes when a user visits the login page.

The record

CVE
CVE-2022-21145
Published
Apr 14, 2022
Updated
Apr 15, 2025
Vendor
Lansweeper
Product
Lansweeper
Classifications
CWE-80, CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 14, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 15, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=9.1.20.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Lansweeper · Lansweeperversion=9.1.20.2

Published CVSS scores

9.1Cisco TalosCVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
3.5NIST NVDAV:N/AC:M/Au:S/C:N/I:P/A:N
4.8NIST NVDCVSS: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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-80Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript/JScript

Public exploit references

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

Technologies

Your stack

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Your stack

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