CVE-2021-30119: Authenticated Authenticated reflective XSS in Kaseya VSA <= v9.5.6

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 58.8% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2021-07-09 · updated 2026-08-14
Weakness: CWE-79

Description

Authenticated reflective XSS in HelpDeskTab/rcResults.asp The parameter result of /HelpDeskTab/rcResults.asp is insecurely returned in the requested web page and can be used to perform a Cross Site Scripting attack Example request: `https://x.x.x.x/HelpDeskTab/rcResults.asp?result=<script>alert(document.cookie)</script>` The same is true for the parameter FileName of /done.asp Eaxmple request: `https://x.x.x.x/done.asp?FileName=";</script><script>alert(1);a="&PathData=&originalName=shell.aspx&FileSize=4388&TimeElapsed=00:00:00.078`

Affected products

Kaseya Vsa: before 9.5.7 — fixed in 9.5.7

How to fix

Upgrade to a fixed version: Kaseya Vsa 9.5.7. Check the vendor advisory for mitigations.

References

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