CVE-2025-28953: Axiomthemes Smartseo SQLi Vulnerability

CVE-2025-28953 Overview

CVE-2025-28953 is an SQL injection vulnerability in the axiomthemes smart SEO (smartSEO) WordPress theme. The flaw stems from improper neutralization of special elements used in an SQL command [CWE-89]. Affected versions include smart SEO up to and including version 4.0. An authenticated attacker with low privileges can inject malicious SQL through unsanitized inputs and manipulate backend database queries. The issue carries a network attack vector with low complexity and a scope change, allowing impact beyond the vulnerable component itself.

Critical Impact
An authenticated attacker can execute arbitrary SQL queries against the WordPress database, leading to disclosure of sensitive data such as user credentials, session tokens, and configuration secrets.

Affected Products

axiomthemes smart SEO (smartSEO) WordPress theme — all versions through 4.0
WordPress sites bundling the vulnerable smartSEO theme
Deployments where low-privileged authenticated users can reach vulnerable endpoints

Discovery Timeline

2025-11-06 - CVE-2025-28953 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-28953

Vulnerability Analysis

The vulnerability is a classic SQL injection issue [CWE-89] in the smartSEO WordPress theme. User-supplied input is concatenated into SQL statements without proper sanitization, parameterization, or use of the WordPress $wpdb->prepare() API. Because the scope is marked as changed, exploitation can affect resources beyond the vulnerable component. The attack can be launched remotely over the network and requires only low privileges, with no user interaction. According to the Patchstack SQL Injection Vulnerability advisory, confidentiality impact is high while integrity is not affected and availability impact is low.

Root Cause

The theme passes attacker-controlled values into SQL queries without escaping or binding them as parameters. WordPress provides safe query construction through wpdb::prepare() and esc_sql(), but the affected smartSEO code paths bypass these protections. This results in untrusted input being interpreted as SQL syntax rather than data.

Attack Vector

An authenticated user with low privileges, such as a subscriber or contributor, sends a crafted HTTP request to a vulnerable theme endpoint or AJAX action. The attacker embeds SQL meta-characters and union-based payloads in a parameter that flows into a database query. The database executes the injected statement, returning data through the response body, error messages, or time-based side channels. Successful exploitation can expose wp_users password hashes, secret keys, and other sensitive records.

No public proof-of-concept code is available for CVE-2025-28953 at the time of writing. Refer to the Patchstack advisory linked above for further technical context.

Detection Methods for CVE-2025-28953

Indicators of Compromise

HTTP requests to smartSEO theme endpoints or admin-ajax.php actions containing SQL meta-characters such as UNION SELECT, SLEEP(, OR 1=1, or --.
Unusual database errors logged by WordPress or MySQL referencing smartSEO query paths.
Authenticated low-privileged accounts (subscribers, contributors) issuing repeated requests with anomalous query parameters.

Detection Strategies

Inspect WordPress access logs for parameters containing encoded SQL syntax (%27, %20OR%20, 0x) directed at theme files under wp-content/themes/smartSEO/.
Enable MySQL general or slow query logging and alert on queries returning unusually large result sets or containing UNION operators originating from theme code.
Deploy a web application firewall ruleset that flags SQLi patterns on authenticated WordPress sessions.

Monitoring Recommendations

Forward WordPress, web server, and database logs to a central SIEM and correlate authenticated session IDs with query anomalies.
Monitor wp_users and wp_options tables for unexpected reads from low-privileged sessions.
Track creation of new administrator accounts or modifications to wp_usermeta capabilities immediately following suspicious requests.

How to Mitigate CVE-2025-28953

Immediate Actions Required

Disable or remove the smartSEO theme until a patched version is confirmed by the vendor.
Audit existing WordPress accounts and revoke unused low-privileged accounts that could be leveraged for authenticated exploitation.
Rotate WordPress secret keys in wp-config.php and reset all user passwords if exploitation is suspected.

Patch Information

At the time of NVD publication, no fixed version above 4.0 is listed for the axiomthemes smartSEO theme. Monitor the Patchstack SQL Injection Vulnerability entry and the axiomthemes vendor channel for an official update, and apply it as soon as it is released.

Workarounds

Switch to an alternative SEO-capable WordPress theme until axiomthemes ships a fix.
Restrict registration and limit which roles can authenticate, reducing the pool of accounts able to reach the vulnerable code path.
Apply a WAF virtual patch that blocks SQL injection payloads on requests targeting wp-content/themes/smartSEO/ and related AJAX actions.

bash

# Example WAF/ModSecurity rule to block SQLi attempts against the smartSEO theme
SecRule REQUEST_URI "@contains /wp-content/themes/smartSEO/" \
  "id:1002895,phase:2,deny,status:403,log,\
   msg:'CVE-2025-28953 smartSEO SQLi attempt',\
   chain"
  SecRule ARGS "@rx (?i)(union(\s|/\*.*\*/)+select|sleep\s*\(|or\s+1=1|--\s|;\s*drop\s+table)" \
    "t:none,t:urlDecodeUni"