What is CVE-2021-21418?

CVE-2021-21418 is a medium-severity vulnerability in Prestashop Ps Emailsubscription, classified under Cross-site Scripting. CVSS score: 4.6/10. Published 2021-03-31.

How severe is CVE-2021-21418?

Medium severity. CVSS v3 base score is 4.6 out of 10.

XSS in Prestashop Ps Emailsubscription

CVE-2021-21418

ps_emailsubscription is a newsletter subscription module for the PrestaShop platform. An employee can inject javascript in the newsletter condition field that will then be executed on the front office The issue has been fixed in 2.6.1

Vulnerability class: XSS (Cross-Site Scripting)

Published 2021-03-31 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.6 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.008 (54.4th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 54th percentile — 54.4% 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

Prestashop Ps Emailsubscription — versions < 2.6.1

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

github.com/PrestaShop/ps_emailsubscription/security/advisories/GHSA-vwfx-hh3w-f… (Third Party Advisory)
github.com/PrestaShop/ps_emailsubscription/commit/664ffb225e2afb4a32640bbedad66… (Patch, Third Party Advisory)
github.com/PrestaShop/ps_emailsubscription/releases/tag/v2.6.1 (Third Party Advisory, Release Notes)
packagist.org/packages/prestashop/ps_emailsubscription (Third Party Advisory)

Frequently asked questions

What is CVE-2021-21418?: CVE-2021-21418 is a medium-severity vulnerability in Prestashop Ps Emailsubscription, classified under Cross-site Scripting. CVSS score: 4.6/10. Published 2021-03-31.
How severe is CVE-2021-21418?: Medium severity. CVSS v3 base score is 4.6 out of 10.