CVE-2025-47587 Overview
CVE-2025-47587 is a blind SQL injection vulnerability in the YayCommerce YaySMTP WordPress plugin. The flaw affects all versions of YaySMTP up to and including 2.6.4. The vulnerability stems from improper neutralization of special elements used in an SQL command [CWE-89], allowing authenticated attackers with high privileges to inject malicious SQL statements through the plugin's input handlers.
Critical Impact
Authenticated attackers with administrative privileges can execute arbitrary SQL queries against the WordPress database, leading to data exposure and potential limited service disruption across the site.
Affected Products
- YayCommerce YaySMTP WordPress plugin versions through 2.6.4
- WordPress sites with the vulnerable YaySMTP plugin installed and activated
- Installations exposing administrative functionality to network-accessible users
Discovery Timeline
- 2025-05-07 - CVE-2025-47587 published to NVD
- 2026-04-23 - Last updated in NVD database
Technical Details for CVE-2025-47587
Vulnerability Analysis
The YaySMTP plugin fails to properly sanitize user-supplied input before incorporating it into SQL queries. The vulnerability is classified as a blind SQL injection, meaning attackers do not directly observe query results in HTTP responses. Instead, they infer database content through boolean conditions or time-based payloads.
The flaw requires high privileges to exploit, limiting the attack surface to authenticated administrative users. The scope is marked as changed, indicating that successful exploitation can impact resources beyond the vulnerable component, such as the underlying WordPress database and dependent integrations. Confidentiality impact is high, while integrity is unaffected and availability impact is low.
Root Cause
The root cause is improper neutralization of special characters such as single quotes and SQL meta-characters in parameters passed to backend database functions. The plugin concatenates attacker-controlled values into SQL statements rather than using parameterized queries or properly escaping inputs via wpdb::prepare().
Attack Vector
An authenticated attacker sends crafted HTTP requests to plugin endpoints accessible from administrative contexts. The attacker injects SQL fragments into vulnerable parameters and uses inference techniques to extract data character by character. Network-based access is sufficient, and no user interaction is required beyond the attacker's own authenticated session.
The vulnerability mechanism is described in the Patchstack SQL Injection Advisory. No verified public proof-of-concept code is currently available.
Detection Methods for CVE-2025-47587
Indicators of Compromise
- Unexpected SQL syntax, comment sequences, or boolean operators in WordPress access logs targeting YaySMTP admin endpoints
- Repeated requests with time-delay functions such as SLEEP() or BENCHMARK() in query parameters
- Anomalous database query latency or error spikes originating from administrative sessions
Detection Strategies
- Inspect WordPress audit logs for administrative accounts issuing high-volume requests to YaySMTP configuration handlers
- Deploy web application firewall (WAF) rules matching SQL injection signatures targeting wp-admin plugin endpoints
- Correlate authenticated admin activity with database query patterns to surface inference-based extraction attempts
Monitoring Recommendations
- Enable verbose query logging at the database tier and alert on UNION, SLEEP, or stacked-query patterns from web sessions
- Track changes to administrator account behavior, particularly off-hours plugin configuration activity
- Monitor the plugin version inventory across WordPress sites and flag installations running YaySMTP <= 2.6.4
How to Mitigate CVE-2025-47587
Immediate Actions Required
- Update YaySMTP to a version newer than 2.6.4 once the vendor releases a patched release
- Audit WordPress administrator accounts and remove unused or excessive privileges to reduce exploitation paths
- Enforce multi-factor authentication on all administrator accounts that could reach the vulnerable plugin endpoints
Patch Information
Refer to the Patchstack SQL Injection Advisory for the latest remediation guidance and patched version availability. Apply the vendor-supplied update through the WordPress plugin manager or via WP-CLI.
Workarounds
- Deactivate and uninstall the YaySMTP plugin until a fixed version is available
- Restrict access to the WordPress administrative interface by IP allowlisting at the web server or WAF
- Deploy a virtual patch via WAF rules to block SQL metacharacters in parameters targeting YaySMTP endpoints
# Example: list and update YaySMTP via WP-CLI
wp plugin list --name=yaysmtp --fields=name,version,status
wp plugin update yaysmtp
# If no patched version is available yet, deactivate the plugin
wp plugin deactivate yaysmtp
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
