What is CVE-2021-40910?

CVE-2021-40910 is a medium-severity vulnerability in Phpcms, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2022-06-15.

How severe is CVE-2021-40910?

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

XSS in Phpcms

CVE-2021-40910

There is a reflective cross-site scripting (XSS) vulnerability in the PHPCMS V9.6.3 management side.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2022-06-15 · 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 (51.4th percentile), scored 2026-10-31.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 51.4% 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

Phpcms — versions 9.6.3

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

gitee.com/phpcms/phpcms/issues/I493K8 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-40910?: CVE-2021-40910 is a medium-severity vulnerability in Phpcms, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2022-06-15.
How severe is CVE-2021-40910?: Medium severity. CVSS v3 base score is 6.1 out of 10.