CVE-2026-78270 Overview
CVE-2026-78270 is a SQL injection vulnerability in the FluentCRM Pro WordPress plugin affecting versions up to and including 3.1.12. The flaw allows authenticated users with Author-level privileges to inject arbitrary SQL into database queries executed by the plugin. The issue is classified under CWE-89: Improper Neutralization of Special Elements used in an SQL Command. Exploitation requires an authenticated account but no user interaction, and the scope change indicates the impact extends beyond the vulnerable component into the underlying WordPress database.
Critical Impact
An authenticated attacker with Author role can read sensitive database contents and degrade site availability by injecting SQL through FluentCRM Pro <= 3.1.12.
Affected Products
- FluentCRM Pro plugin for WordPress (fluentcampaign-pro)
- All versions up to and including 3.1.12
- WordPress sites running the plugin with Author-or-higher user accounts
Discovery Timeline
- 2026-08-24 - CVE-2026-78270 published to NVD
- 2026-08-24 - Last updated in NVD database
Technical Details for CVE-2026-78270
Vulnerability Analysis
The vulnerability resides in FluentCRM Pro, a customer relationship management and email marketing plugin for WordPress. User-controllable input reaches a SQL query without sufficient sanitization or parameterization. An authenticated user holding the Author role, or any higher-privileged account, can submit crafted payloads through plugin request parameters. The database driver then executes attacker-supplied SQL fragments alongside the intended query.
Because WordPress runs plugin queries against the same database that stores authentication material, post content, and site options, the scope of the exposure extends past the plugin itself. The CVSS vector reports high confidentiality impact and low availability impact, but no integrity impact. This pattern is consistent with blind or UNION-based extraction rather than direct write primitives.
Root Cause
The root cause is missing or incomplete input neutralization before user input is concatenated into a SQL statement. FluentCRM Pro passes request data into a query builder or raw query context without binding parameters or escaping metacharacters. See the Patchstack vulnerability report for advisory-level detail.
Attack Vector
Exploitation is remote over the network. The attacker must first authenticate to WordPress with at least Author privileges, then issue crafted HTTP requests to a vulnerable FluentCRM Pro endpoint. The injected SQL executes with the database privileges of the WordPress site user, typically permitting reads across all tables including wp_users and wp_usermeta. No verified proof-of-concept code is publicly available.
Detection Methods for CVE-2026-78270
Indicators of Compromise
- Unusual HTTP POST or GET requests to FluentCRM Pro admin-ajax or REST endpoints containing SQL keywords such as UNION, SELECT, SLEEP, or INFORMATION_SCHEMA.
- Anomalously long response times from FluentCRM Pro endpoints, suggesting time-based blind injection.
- Author-role sessions issuing requests to plugin endpoints outside normal editorial workflows.
- Database error strings surfaced in HTTP responses from /wp-admin/admin-ajax.php when the FluentCRM action parameter is present.
Detection Strategies
- Enable WordPress database query logging or use a web application firewall in detection mode to capture parameter values sent to FluentCRM Pro endpoints.
- Alert on requests where FluentCRM parameters contain URL-encoded quotes, comment sequences (--, #), or stacked query separators.
- Correlate authenticated Author-role activity with plugin endpoint access patterns that deviate from baseline.
Monitoring Recommendations
- Ingest WordPress access logs and MySQL general query logs into a centralized analytics platform for retrospective hunting.
- Track failed database queries and MySQL error rates originating from the WordPress database user.
- Review the audit trail for new Author-or-higher accounts created before the plugin was patched.
How to Mitigate CVE-2026-78270
Immediate Actions Required
- Upgrade FluentCRM Pro to a version later than 3.1.12 as soon as the vendor publishes a fixed release, per the Patchstack advisory.
- Audit WordPress user accounts and remove or downgrade any Author-or-higher accounts that are no longer required.
- Rotate WordPress secrets in wp-config.php and force password resets if injection activity is suspected.
Patch Information
Refer to the Patchstack vulnerability report for the current patched version and vendor guidance. Apply the update through the WordPress plugin manager or by replacing the plugin directory with the vendor-supplied archive.
Workarounds
- Restrict access to /wp-admin/ and FluentCRM Pro REST routes by source IP where operationally feasible.
- Deploy a WordPress-aware web application firewall rule that blocks SQL metacharacters in FluentCRM Pro request parameters.
- Temporarily deactivate FluentCRM Pro if patching cannot be completed and Author accounts cannot be constrained.
# Configuration example: verify installed FluentCRM Pro version via WP-CLI
wp plugin get fluentcampaign-pro --field=version
wp plugin update fluentcampaign-pro
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
