CVE-2026-39581: SQL Injection in WP Sessions Time Monitoring Full Automatic Plugin

Technical summary

CVE-2026-39581 is a subscriber-level SQL injection flaw (CWE-89) affecting WP Sessions Time Monitoring Full Automatic up to version 1.1.4. The plugin fails to properly sanitize user-supplied input before constructing SQL queries, allowing authenticated subscribers to execute arbitrary SQL. The CVSS v3.1 score of 8.5 (HIGH) reflects network accessibility, low attack complexity, and the ability to impact confidentiality across system boundaries, though integrity and availability impact are limited.

Business impact

The vulnerability poses a material risk to WordPress sites using this plugin with multiple user accounts. Attackers with subscriber credentials can access sensitive database content, including user email addresses, authentication tokens, or business-critical data stored in custom tables. On sites hosting confidential information, this could lead to compliance violations (GDPR, HIPAA, CCPA) and reputational harm. The attack requires no special tools or user interaction, increasing the likelihood of exploitation by insiders or compromised low-privilege accounts.

Affected systems

WP Sessions Time Monitoring Full Automatic plugin versions 1.1.4 and earlier are vulnerable. The plugin must be installed and activated on a WordPress site for exposure. Any WordPress installation allowing subscriber-level user registration or account creation is at heightened risk, particularly multi-tenant or community-driven sites. The vulnerability does not affect WordPress core or other plugins unless they depend on this plugin's functionality.

Exploitability

The vulnerability is relatively straightforward to exploit for anyone with valid subscriber credentials. No authentication bypass is required, and standard SQL injection payloads can be crafted to enumerate database structure and extract data. The attack leaves standard query logs, though detection depends on log monitoring practices. Active exploitation is plausible but has not yet been documented in widespread campaigns; the vulnerability was only recently published.

Remediation

Update WP Sessions Time Monitoring Full Automatic to the latest version released after June 2026, which includes input sanitization and parameterized query fixes. Verify against the vendor's advisory that the update addresses CWE-89. As an interim measure, restrict subscriber user registration, audit existing subscriber accounts, and consider disabling the plugin if updates are unavailable or delayed. Apply database access controls and monitor query logs for suspicious SQL patterns.

Patch guidance

Check the official WP Sessions Time Monitoring Full Automatic plugin repository or vendor website for version 1.1.5 or later. Test updates in a staging environment before production deployment. If the vendor has not released a patch, consider uninstalling the plugin and migrating to alternative session monitoring solutions. Verify the patch version in wp-content/plugins/wp-sessions-time-monitoring/readme.txt or the plugin metadata.

Detection guidance

Monitor database logs for SQL injection patterns in queries initiated by subscriber users (watch for UNION, SELECT, OR, SLEEP, or BENCHMARK keywords). Check WordPress debug logs for SQL errors. Use Web Application Firewalls (WAF) to block common SQL injection signatures in HTTP parameters. Query WordPress user metadata for unusual subscriber account creation dates. Audit plugin code with static analysis tools or compare against the patched version to identify input validation gaps.

Why prioritize this

Although not yet in CISA KEV, the vulnerability merits rapid attention because it combines authenticated access (low barrier in open registration environments) with high confidentiality impact and cross-boundary effects (CVSS C:H, S:C). The plugin may be installed on sites with sensitive customer or business data. Early patching prevents exploitation by compromised accounts or malicious insiders and avoids potential regulatory exposure.

Risk score, explained

CVSS 8.5 reflects: Network-accessible attack surface (AV:N), minimal complexity once authenticated (AC:L), low privilege requirement (PR:L), no user interaction needed (UI:N), and scope change allowing impact beyond the vulnerable component (S:C). High confidentiality impact (C:H) drives severity. Limited availability impact (A:L) and no integrity impact (I:N) prevent a critical rating. For organizations hosting PII or regulated data, consider internal risk multipliers that elevate this further.

Frequently asked questions