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MEDIUM severity

Potential XSS injection in the newsletter conditions fieldGHSA-vwfx-hh3w-fj99

MEDIUMFix: PrestaShop/ps_emailsubscription@664ffb2

GHSA-vwfx-hh3w-fj99 is a medium-severity (CVSS 4.6) Cross-site Scripting (XSS) vulnerability in prestashop/ps_emailsubscription. A fix is available for prestashop/ps_emailsubscription — see the affected versions and patch details below.

Also known asCVE-2021-21418
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Oct 12, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
0.8%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs55th percentile — riskier than 55% of all scored CVEsHighest risk
0.00%0.43%0.86%1.29%0.3%0.8%Apr 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

GHSA-vwfx-hh3w-fj99 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,987 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

1 pkg affected
🐘prestashop/ps_emailsubscription

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

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

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistprestashop/ps_emailsubscriptionall versions2.6.1composer require prestashop/ps_emailsubscription:^2.6.1

Affected Products

1 product · 1 configurations
Application
ps emailsubscriptionprestashop
≥ 2.6.0 && < 2.6.1
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for prestashop/ps_emailsubscription, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update prestashop/ps_emailsubscription to 2.6.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-vwfx-hh3w-fj99 is resolved across your whole dependency graph.

  3. Workarounds

    Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

### Impact An employee can inject javascript in the newsletter condition field that will then be executed on the front office ### Patches The issue has been fixed in 2.6.1
O3 Security · Impact-Aware SCA

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Potential XSS injection in the newsletter conditions field