CVE-2026-2721 MailArchiver <= 4.4.0 - Authenticated (Administrator+) Stored Cross-Site Scripting via Settings
Administrators can inject scripts into MailArchiver settings, affecting multi-site or restricted HTML installations.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-2721?
CVE-2026-2721 is a medium-severity cross-site scripting vulnerability in pierrelannoy MailArchiver, published on 7 Mar 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Official description
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.
Weakness: CWE-79
Which versions are affected by CVE-2026-2721?
How do I fix CVE-2026-2721?
No fix has been published for CVE-2026-2721 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-2721 being exploited?
There is no known exploitation of CVE-2026-2721 in the wild and no public exploit code.
Sources
Also known as GHSA-9853-xxjp-h6jv.