What is CVE-2026-2721?

CVE-2026-2721 is a medium-severity vulnerability in Pierrelannoy Mailarchiver, classified under Cross-site Scripting. CVSS score: 4.8/10. Published 2026-03-07.

How severe is CVE-2026-2721?

Medium severity. CVSS v3 base score is 4.8 out of 10.

XSS in Pierrelannoy Mailarchiver

CVE-2026-2721

The MailArchiver plugin for WordPress is vulnerable to Stored Cross-Site Scripting via admin settings in all versions up to, and including, 4.4.0 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with administrator-level permissions and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This only affects multi-site installations and installations where unfiltered_html has been disabled.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2026-03-07 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.003 (25.7th percentile), scored 2026-10-04.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 26th percentile — 25.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001

Affected products

Pierrelannoy Mailarchiver — versions 0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

Frequently asked questions

What is CVE-2026-2721?: CVE-2026-2721 is a medium-severity vulnerability in Pierrelannoy Mailarchiver, classified under Cross-site Scripting. CVSS score: 4.8/10. Published 2026-03-07.
How severe is CVE-2026-2721?: Medium severity. CVSS v3 base score is 4.8 out of 10.