CVE-2026-2497: 
WordPress vulnerability analysis and mitigation

CVE-2026-2497 is a SQL Injection vulnerability in the Gallery by BestWebSoft plugin for WordPress, affecting all versions up to and including 4.7.9. The flaw resides in the gllr_save_postdata() function, which stores unsanitized array keys from $_POST (specifically the _gallery_order_{post_id} parameter) directly into post meta, which are later used in SQL queries without prepared statements. It was published on August 16, 2026, and carries a CVSS v3.1 base score of 7.2 (High) (GitHub Advisory, Wordfence).

The root cause is classified as CWE-89 (Improper Neutralization of Special Elements used in an SQL Command). The gllr_save_postdata() function in gallery-plugin.php accepts array keys from the _gallery_order_{post_id} POST parameter without sanitization or escaping, stores them in post meta, and subsequently incorporates them into SQL queries without using WordPress prepared statements. This allows an attacker to inject arbitrary SQL by crafting malicious array keys in the POST request. The vulnerable code paths are visible in the plugin's source at gallery-plugin.php#L1052 and includes/class-gllr-media-table.php#L58 (GitHub Advisory, Wordfence).

Successful exploitation allows an authenticated attacker with Editor-level access or above to append arbitrary SQL queries to existing database queries, enabling extraction of sensitive information from the WordPress database — including user credentials, private content, and configuration data. Depending on database server permissions, the attacker may also be able to modify or delete database contents, potentially leading to site defacement or further compromise. The integrity and availability of the WordPress installation are also at risk (GitHub Advisory, Wordfence).

As of the disclosure date (August 16, 2026), there is no public proof-of-concept exploit and no evidence of active in-the-wild exploitation. The EPSS score is 0.0, indicating a currently low probability of exploitation in the near term. The vulnerability is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog. Exploitation requires authenticated access at the Editor level or above, which limits the attack surface compared to unauthenticated vulnerabilities (GitHub Advisory, Wordfence).

1. Reconnaissance: Identify WordPress sites running the Gallery by BestWebSoft plugin version 4.7.9 or earlier. This can be done by checking the plugin's readme.txt file (e.g., /wp-content/plugins/gallery-plugin/readme.txt) or using tools like WPScan.
2. Obtain Editor-level credentials: Acquire valid WordPress credentials with at least Editor-level privileges through phishing, credential stuffing, or other means.
3. Authenticate: Log in to the WordPress admin panel using the obtained credentials.
4. Craft malicious POST request: Navigate to a gallery post edit page and intercept the save/update request. Modify the array keys of the _gallery_order_{post_id} POST parameter to include SQL injection payloads (e.g., 1 UNION SELECT user_login,user_pass,3 FROM wp_users-- -).
5. Trigger SQL injection: Submit the crafted POST request to the gllr_save_postdata() function, which stores the unsanitized array keys into post meta.
6. Extract data: Trigger the subsequent SQL query (e.g., by loading the gallery management page) that incorporates the injected post meta values, causing the database to return sensitive data such as WordPress user hashes (GitHub Advisory, Wordfence).

• Network: Unusual POST requests to WordPress admin endpoints (e.g., wp-admin/post.php) containing array keys in _gallery_order_{post_id} parameters with SQL syntax such as UNION, SELECT, --, or encoded equivalents.
• Logs: WordPress or web server access logs showing repeated POST requests to gallery post edit pages from a single authenticated session, particularly with abnormally long or structured parameter keys.
• Database: Unexpected or anomalous SQL query patterns in database slow query logs or general query logs involving the wp_postmeta table with injected SQL fragments.
• File System: No specific file artifacts expected for this SQL injection type, but monitor for new admin accounts or modified user records in the WordPress database that may indicate post-exploitation activity.

Update the Gallery by BestWebSoft plugin to a version newer than 4.7.9 as soon as a patched release becomes available; the plugin changeset referenced in the advisory (changeset 3609291) indicates a fix has been committed to the plugin repository (GitHub Advisory). As an interim measure, restrict Editor-level and above WordPress roles to only fully trusted users, and consider temporarily deactivating the plugin if the risk is unacceptable. Implement a Web Application Firewall (WAF) rule to detect and block SQL injection patterns in POST parameters targeting WordPress admin endpoints (Wordfence).