What is CVE-2020-27974?

CVE-2020-27974 is a medium-severity vulnerability in Quadient Mail Accounting, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2020-10-28.

How severe is CVE-2020-27974?

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

XSS in Quadient Mail Accounting

CVE-2020-27974

NeoPost Mail Accounting Software Pro 5.0.6 allows php/Commun/FUS_SCM_BlockStart.php?code= XSS.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2020-10-28 · 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 (56.2th percentile), scored 2026-10-03.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 56th percentile — 56.2% 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

Quadient Mail Accounting — versions 5.0.6

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

herolab.usd.de/security-advisories/usd-2020-0029/ (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2020-27974?: CVE-2020-27974 is a medium-severity vulnerability in Quadient Mail Accounting, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2020-10-28.
How severe is CVE-2020-27974?: Medium severity. CVSS v3 base score is 6.1 out of 10.