What is CVE-2022-31303?

CVE-2022-31303 is a medium-severity vulnerability in Maccms, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2022-06-21.

How severe is CVE-2022-31303?

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

XSS in Maccms

CVE-2022-31303

maccms10 was discovered to contain a stored cross-site scripting (XSS) vulnerability via the Server Group text field.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2022-06-21 · 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: 0.004 (34.6th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 35th percentile — 34.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000

Affected products

Maccms — versions 10.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

github.com/maccmspro/maccms10/issues/20 (Exploit, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2022-31303?: CVE-2022-31303 is a medium-severity vulnerability in Maccms, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2022-06-21.
How severe is CVE-2022-31303?: Medium severity. CVSS v3 base score is 5.4 out of 10.