What is CVE-2021-42970?

CVE-2021-42970 is a medium-severity vulnerability in Cxuu Cxuucms, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2022-03-29.

How severe is CVE-2021-42970?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Is CVE-2021-42970 known to be exploited?

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

XSS in Cxuu Cxuucms

CVE-2021-42970

Cross Site Scripting (XSS) vulnerability exists in cxuucms v3 via the imgurl of /feedback/post/ content parameter.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2022-03-29 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.007 (51.9th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 51.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Cxuu Cxuucms — versions 3.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

References

github.com/cbkhwx/cxuucmsv3/issues/8 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-42970?: CVE-2021-42970 is a medium-severity vulnerability in Cxuu Cxuucms, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2022-03-29.
How severe is CVE-2021-42970?: Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2021-42970 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.