What is CVE-2021-40094?

CVE-2021-40094 is a medium-severity vulnerability in Squaredup, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2021-12-07.

How severe is CVE-2021-40094?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Is CVE-2021-40094 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

XSS in Squaredup

CVE-2021-40094

A DOM-based XSS vulnerability affects SquaredUp for SCOM 5.2.1.6654. If successfully exploited, this vulnerability may allow attackers to inject malicious code into a user's device.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2021-12-07 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.005 (37.2th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 37th percentile — 37.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Squaredup

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

kaje11/CVEs

References

support.squaredup.com (Vendor Advisory)
support.squaredup.com/hc/en-us/articles/4410656395537-CVE-2021-40094-DOM-based-… (Vendor Advisory)

Frequently asked questions

What is CVE-2021-40094?: CVE-2021-40094 is a medium-severity vulnerability in Squaredup, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2021-12-07.
How severe is CVE-2021-40094?: Medium severity. CVSS v3 base score is 5.4 out of 10.
Is CVE-2021-40094 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.