CVE-2022-21145
Published: 14 April 2022
Summary
CVE-2022-21145 is a medium-severity Basic XSS (CWE-80) vulnerability in Lansweeper Lansweeper. Its CVSS base score is 4.8 (Medium).
Operationally, ranked in the top 11.1% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
Deeper analysis
A stored cross-site scripting vulnerability exists in the WebUserActions.aspx functionality of Lansweeper 9.1.20.2. Tracked as CVE-2022-21145 with associated CWEs 79 and 80, the flaw allows arbitrary JavaScript code injection when a specially crafted HTTP request is processed by the affected component.
An attacker with high privileges can exploit the issue over the network by sending the malicious request, leading to JavaScript execution that affects other users who interact with the page. The CVSS 4.8 score reflects the combination of network attack vector, low attack complexity, high privileges required, user interaction needed, and limited confidentiality and integrity consequences with no availability impact.
References from Talos Intelligence and the Lansweeper changelog provide further details on the issue. The associated EPSS score rose from a low baseline to a peak of 0.0661 on 2025-12-11 before receding to the current value of 0.0411.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2022-26391
Vulnerability details
A stored cross-site scripting vulnerability exists in the WebUserActions.aspx functionality of Lansweeper lansweeper 9.1.20.2. A specially-crafted HTTP request can lead to arbitrary Javascript code injection. An attacker can send an HTTP request to trigger this vulnerability.
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Penetration testing submits XSS payloads to web applications, detecting cross-site scripting flaws for subsequent remediation.
Validates web inputs to reject script-related content that could produce XSS.
Output validation against expected content can reject or sanitize script content in generated web pages, reducing XSS exploitability.