Security readout for executives and security teams
Plain-English summary
CVE-2026-2721 is a stored cross-site scripting issue in the WordPress MailArchiver plugin through version 4.4.0. It requires administrator-level access, so the main risk is from compromised or malicious admins. Impact is limited but could affect users who view the altered settings page.
Executive priority
Treat as a routine but real WordPress plugin security update. It is not currently known to be exploited and requires admin privileges, but compromised admin accounts could turn it into a user-targeting browser risk.
Technical view
MailArchiver insufficiently sanitized and escaped admin settings, allowing authenticated Administrator+ users to store script content that executes when another user accesses the affected page. The CVSS 3.1 score is 4.8 with high privileges required and user interaction required. Sources say it affects multisite installations and sites where unfiltered_html is disabled.
Likely exposure
Exposure is limited to WordPress sites running MailArchiver up to and including 4.4.0, under the stated multisite or unfiltered_html-disabled conditions. Single-site installs with normal administrator unfiltered_html behavior may not be affected according to the CVE description.
Exploitation context
No active exploitation is indicated by KEV or the provided sources. Exploitation requires an authenticated Administrator+ account and a victim user visiting the injected admin page. This makes it more relevant to insider risk, compromised admin accounts, and hardened WordPress environments.
Researcher notes
The vulnerability is CWE-79 stored XSS. The affected metadata in the bundle is inconsistent, listing product/version data that does not clearly match the narrative affected range. The commit and WordPress changeset appear to address sanitization/escaping, but the provided sources do not clearly name a fixed version.
Mitigation direction
- Inventory WordPress sites for the MailArchiver plugin and installed version.
- Prioritize sites running MailArchiver 4.4.0 or earlier.
- Check the vendor or WordPress plugin page for the fixed release guidance.
- Apply the available MailArchiver update after testing.
- Review administrator accounts for compromise or unnecessary privileges.
Validation and detection
- Confirm whether the site is WordPress multisite or has unfiltered_html disabled.
- Check MailArchiver version against the affected range in the CVE description.
- Review recent MailArchiver settings changes by administrator accounts.
- Verify updated code includes added sanitization and escaping changes.
- Monitor admin activity logs for unexpected settings modifications.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-79: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2026-2721 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 4.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N1.72.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
4.8MediumVector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://www.wordfence.com/threat-intel/vulnerabilities/id/df2674c9-da77-412c-a812-f1749f54d04b?source=cveCVE reference
- https://plugins.trac.wordpress.org/browser/mailarchiver/trunk/includes/system/class-form.php#L92CVE reference
- https://plugins.trac.wordpress.org/browser/mailarchiver/tags/4.4.0/includes/system/class-form.php#L92CVE reference
- https://github.com/Pierre-Lannoy/wp-mailarchiver/commit/946c1a700bbecc6080a427fd428de800334af824CVE reference
- https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3465101%40mailarchiver&new=3465101%40mailarchiver&sfp_email=&sfph_mail=CVE reference
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.