CVE-2026-2508: Gravity Forms Booking SQL Injection Vulnerability (v2.7.1 and Earlier)

Technical summary

CVE-2026-2508 is a time-based SQL injection vulnerability in the Gravity Forms Booking plugin caused by insufficient input escaping and lack of prepared statements on the 'staff_id' parameter. The vulnerability allows authenticated users (CWE-89: Improper Neutralization of Special Elements used in an SQL Command) to execute arbitrary SQL queries against the WordPress database. Time-based exploitation enables attackers to extract data through response timing analysis even without direct query output visibility. The CVSS 3.1 score of 6.5 (MEDIUM) reflects high confidentiality impact with low attack complexity and network accessibility, though exploitation requires valid credentials.

Business impact

This vulnerability enables data exfiltration from WordPress databases hosting sensitive information—potentially including user credentials, payment records, customer data, and internal business details. For organizations using Gravity Forms Booking for scheduling or client management, a compromised database could lead to regulatory violations (GDPR, HIPAA, PCI DSS depending on data sensitivity), reputational damage, and customer notification obligations. The authentication requirement moderates risk but does not eliminate it, particularly for sites with permissive user registration policies or where subscriber accounts have been compromised through other means.

Affected systems

All versions of the Gravity Forms Booking plugin up to and including version 2.7.1 are affected. This includes WordPress sites that have installed the plugin regardless of other security posture. The vulnerability does not affect other Gravity Forms products or extensions not named in the vulnerable plugin, and is specific to the Booking add-on functionality.

Exploitability

Exploitation requires valid WordPress authentication at Subscriber level or above, making this a post-authentication attack. While this raises the barrier compared to unauthenticated flaws, many WordPress sites allow public registration, and subscriber accounts are the lowest privilege tier. Time-based SQL injection is reliable but slower than blind union-based or error-based approaches; an attacker would need to craft timed requests to infer data. No known public exploits, active attacks, or CISA KEV listing currently exist, suggesting exploitation remains theoretical rather than widespread in the wild.

Remediation

Update the Gravity Forms Booking plugin to a patched version released after 2.7.1. Verify the exact patch version number against the official Gravity Forms advisory or plugin repository. If an immediate update is not feasible, restrict Subscriber role permissions or disable user registration temporarily. Monitor database access logs for unusual SQL patterns or time-delayed requests originating from authenticated sessions.

Patch guidance

Navigate to WordPress Plugins → Installed Plugins, locate Gravity Forms Booking, and select 'Update Now' if a newer version is available. Alternatively, download the patched version directly from the official Gravity Forms plugin repository and manually upload via SFTP or the WordPress admin dashboard. Test the update in a staging environment before applying to production to confirm compatibility with custom forms and booking workflows. Verify against the official Gravity Forms advisory to confirm the patch version number addresses CVE-2026-2508.

Detection guidance

Enable WordPress database query logging to identify unusual SQL commands within POST parameters or form submissions. Search web server access logs for repeated requests to booking endpoints with varying 'staff_id' values, especially with timing delays that suggest SQL injection probing. Monitor for authentication logs showing Subscriber or higher accounts executing unusually high numbers of API or form requests. Consider deploying a Web Application Firewall (WAF) rule to detect SQL keywords in the 'staff_id' parameter such as UNION, SLEEP(), BENCHMARK(), or comment sequences (-- or /*).

Why prioritize this

While this vulnerability carries MEDIUM severity and requires authentication, the data exfiltration risk and database-level access potential elevate it in the remediation queue. Organizations running Gravity Forms Booking with public-facing forms or shared subscriber access should treat this as a near-term patch priority. Sites with strict user management and low subscriber counts may deprioritize slightly, but the 6.5 CVSS and confidentiality impact warrant action within 30 days.

Risk score, explained

The CVSS 3.1 score of 6.5 reflects a Medium-severity vulnerability with high confidentiality impact (C:H), no integrity or availability impact, low attack complexity (AC:L), network attack surface (AV:N), and low privilege requirements (PR:L). The score does not account for threat landscape factors; the absence of CISA KEV listing and active exploitation indicates lower immediate threat, but this should not delay patching given the direct database access potential.

Frequently asked questions