MailArchiver <= 4.4.0 - Authenticated (Administrator+) Stored Cross-Site Scripting via Settings
Key facts
- Attack vector
- Network
- Privileges required
- High
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Pierre Lannoy | MailArchiver | up to 4.4.0 | — | No fix listed | CNA |
- MailArchiver VendorPierre Lannoy Affected up to 4.4.0 Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2026-2721
- 2026-10-03 Alias added: GHSA-9853-xxjp-h6jv
References
Other 8
- https://www.wordfence.com/threat-intel/vulnerabilities/id/df2674c9-da77-412c-a812-f1749f54d04b?source=cve
- https://plugins.trac.wordpress.org/browser/mailarchiver/trunk/includes/system/class-form.php#L92
- https://plugins.trac.wordpress.org/browser/mailarchiver/tags/4.4.0/includes/system/class-form.php#L92
- https://plugins.trac.wordpress.org/browser/mailarchiver/tags/4.4.0/includes/system/class-form.php#L55
- https://plugins.trac.wordpress.org/browser/mailarchiver/tags/4.4.0/includes/system/class-form.php#L126
- https://plugins.trac.wordpress.org/browser/mailarchiver/tags/4.4.0/includes/system/class-form.php#L156
- https://github.com/Pierre-Lannoy/wp-mailarchiver/commit/946c1a700bbecc6080a427fd428de800334af824
- https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3465101%40mailarchiver&new=3465101%40mailarchiver&sfp_email=&sfph_mail=
More Pierre Lannoy vulnerabilities
- TI-2025-08410 Vibes <= 2.2.0 - Unauthenticated SQL Injection via `resource` Parameter CVSS 3.1HIGH 7.5
- TI-2024-19991 WordPress DecaLog plugin <= 3.9.0 - SQL Injection vulnerability CVSS 3.1HIGH 7.6
- TI-2024-37046 WordPress Device Detector Plugin <= 4.2.0 - Reflected Cross Site Scripting (XSS) vulnerability CVSS 3.1HIGH 7.1
- TI-2025-22096 WordPress IP Locator plugin <= 4.1.0 - Cross Site Scripting (XSS) vulnerability CVSS 3.1MEDIUM 6.5
- TI-2025-35744 WordPress Sessions Plugin <= 3.2.0 - Cross Site Scripting (XSS) Vulnerability CVSS 3.1MEDIUM 5.9
- TI-2026-02431 MailArchiver <= 4.5.0 - Authenticated (Admininistrator+) SQL Injection via 'logid' Parameter CVSS 3.1MEDIUM 4.9
Sources
- CVE-2026-2721 · CVE Program
- CVE-2026-2721 · NVD
- FIRST EPSS
- GHSA-9853-xxjp-h6jv · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences