What is CVE-2020-5552?

CVE-2020-5552 is a medium-severity vulnerability in Keitai-Site.net Mailform, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2020-03-25.

How severe is CVE-2020-5552?

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

XSS in Keitai-Site.net Mailform

CVE-2020-5552

Cross-site scripting vulnerability in mailform version 1.04 allows remote attackers to inject arbitrary web script or HTML via unspecified vectors.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2020-03-25 · 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: 0.008 (54.1th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 54th percentile — 54.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Keitai-Site.net Mailform — versions version 1.04
Mailform — versions 1.04

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

jvn.jp/en/jp/JVN85942151/index.html (Third Party Advisory)

Frequently asked questions

What is CVE-2020-5552?: CVE-2020-5552 is a medium-severity vulnerability in Keitai-Site.net Mailform, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2020-03-25.
How severe is CVE-2020-5552?: Medium severity. CVSS v3 base score is 6.1 out of 10.