Security readout for executives and security teams
Plain-English summary
CVE-2026-2831 affects the WordPress MailArchiver plugin up to version 4.5.0. An already-authenticated WordPress administrator could abuse a database query parameter to read sensitive database information. This is not a drive-by internet attack scenario; it requires administrator-level access first.
Executive priority
Treat as a moderate priority. The vulnerability can expose sensitive database data, but only to users who already have WordPress administrator-level access. Prioritize sites with sensitive mail archives, many administrators, or recent admin account compromise concerns.
Technical view
The issue is SQL injection in the MailArchiver plugin’s `logid` parameter, caused by insufficient escaping and query preparation. Sources identify CWE-89 and CVSS 3.1 score 4.9: network reachable, low complexity, high privileges required, no user interaction, high confidentiality impact, no integrity or availability impact.
Likely exposure
Exposure is limited to WordPress sites running MailArchiver versions up to and including 4.5.0 where an attacker has Administrator-level access or higher. Sites not using this plugin, or without compromised/admin users, are unlikely to be directly exposed.
Exploitation context
The source bundle does not indicate active exploitation, and the CVE is not listed as KEV. Exploitation requires authenticated administrator privileges, so the main concern is post-compromise data access or abuse by malicious insiders with admin access.
Researcher notes
The provided references point to vulnerable MailArchiver code paths involving event viewing and event handling. The public description names the `logid` parameter and insufficient SQL query preparation. No public exploit status, fixed version, or vendor patch details are included in the provided source bundle.
Mitigation direction
- Inventory WordPress sites for the MailArchiver plugin and installed version.
- If running version 4.5.0 or earlier, check vendor guidance for an updated fixed release.
- If no fix is available, disable the plugin where business impact allows.
- Restrict and review WordPress administrator accounts on affected sites.
- Monitor database and admin activity for unusual access patterns.
Validation and detection
- Confirm whether MailArchiver is installed on each WordPress site.
- Record the installed plugin version and compare against 4.5.0 or earlier.
- Review administrator account list for unknown, stale, or overprivileged users.
- Check vendor and Wordfence advisories for remediation status.
- Review logs for suspicious admin activity involving MailArchiver event or log views.
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-89: Database access and collection lookup
Injection into data stores can inform collection, data access, and exfiltration detection reviews. 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 lookupDatabase behavior lookup
The CVE wording references database injection or access, so collection and exfiltration review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-2831 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
- 4.9 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/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:N/S:U/C:H/I:N/A:N1.23.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
4.9MediumVector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://www.wordfence.com/threat-intel/vulnerabilities/id/5bc8da1b-8095-46b5-8268-63bdddb4e629?source=cveCVE reference
- https://plugins.trac.wordpress.org/browser/mailarchiver/tags/4.5.0/includes/features/class-eventviewer.php#L79CVE reference
- https://plugins.trac.wordpress.org/browser/mailarchiver/tags/4.5.0/includes/features/class-events.php#L614CVE 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 Special Elements used in an SQL Command ('SQL Injection')
Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.