CVE-2026-39511: WP Photo Album Plus SQLi Vulnerability

CVE-2026-39511 Overview

CVE-2026-39511 is an unauthenticated SQL injection vulnerability affecting the WP Photo Album Plus WordPress plugin in versions up to and including 9.1.08.001. The flaw is tracked under CWE-89, Improper Neutralization of Special Elements used in an SQL Command. Remote attackers can inject SQL statements without authentication, leveraging the network attack vector to reach affected WordPress installations. The vulnerability carries a scope-changed impact, meaning successful exploitation affects resources beyond the vulnerable component itself.

Critical Impact
Unauthenticated attackers can inject arbitrary SQL queries against WordPress sites running WP Photo Album Plus <= 9.1.08.001, exposing database contents and impacting site availability.

Affected Products

WP Photo Album Plus WordPress plugin versions <= 9.1.08.001
WordPress sites with the plugin installed and network-accessible
Any environment exposing the plugin endpoints to untrusted users

Discovery Timeline

2026-06-15 - CVE-2026-39511 published to the National Vulnerability Database
2026-06-17 - Entry last modified in NVD

Technical Details for CVE-2026-39511

Vulnerability Analysis

The vulnerability resides in WP Photo Album Plus, a WordPress plugin used to manage photo albums and galleries. The plugin fails to sanitize or parameterize user-controlled input before incorporating it into SQL statements processed by the WordPress database layer. Because the affected request paths do not require authentication, any remote actor capable of reaching the WordPress site can deliver crafted payloads. The scope-changed nature of the issue indicates the injected SQL can affect database resources outside the plugin's own tables, including core WordPress data.

Root Cause

The root cause is improper neutralization of special elements in SQL queries, classified as [CWE-89]. The plugin concatenates request parameters directly into SQL strings rather than using $wpdb->prepare() with placeholder binding. This allows attacker-supplied content to break out of the intended query context and append arbitrary SQL clauses. Refer to the Patchstack advisory for vulnerable code paths.

Attack Vector

Attackers send crafted HTTP requests to plugin endpoints exposed on the target WordPress installation. The request requires no privileges and no user interaction. Typical exploitation techniques include UNION-based extraction to read database tables, boolean-based blind injection to enumerate records, and time-based payloads using SLEEP() to confirm execution. Sensitive data exposure includes wp_users credential hashes, session tokens, and option values stored in wp_options.

Detection Methods for CVE-2026-39511

Indicators of Compromise

HTTP requests to WP Photo Album Plus endpoints containing SQL metacharacters such as ', --, UNION SELECT, or SLEEP(
Anomalous outbound queries from the WordPress database user, including reads against wp_users or wp_usermeta
Unexpected new administrator accounts or modified wp_options rows following plugin requests
Web server access logs showing repeated parameter fuzzing against plugin URLs

Detection Strategies

Inspect web access logs for SQL injection signatures in query strings and POST bodies targeting plugin handlers
Enable WordPress query logging or database audit logging to surface UNION and time-delay payloads
Deploy a Web Application Firewall with SQL injection rulesets in blocking mode for the WordPress site
Correlate plugin requests with subsequent privileged database operations to identify successful exploitation

Monitoring Recommendations

Alert on HTTP 500 responses or unusual response sizes from plugin endpoints
Track database query latency spikes that may indicate time-based blind injection attempts
Monitor WordPress administrator account creation and role changes in near real time
Forward web, application, and database logs to a centralized analytics platform for cross-source correlation

How to Mitigate CVE-2026-39511

Immediate Actions Required

Identify all WordPress installations running WP Photo Album Plus and confirm the installed version against 9.1.08.001
Deactivate the plugin until a patched version is installed if exposure cannot be controlled at the perimeter
Restrict access to the WordPress site using IP allow-listing or authentication proxies where feasible
Rotate database credentials, WordPress secret keys in wp-config.php, and administrator passwords if exploitation is suspected

Patch Information

Review the Patchstack advisory for fixed version details and update WP Photo Album Plus to a release later than 9.1.08.001 as soon as the vendor publishes one. Apply updates through the WordPress administration console or by deploying the patched plugin package directly to wp-content/plugins/wp-photo-album-plus/.

Workarounds

Disable and remove the WP Photo Album Plus plugin until a fixed version is available
Deploy WAF virtual patching rules to block SQL injection patterns directed at plugin URLs
Apply least-privilege principles to the WordPress database user to limit the impact of injected queries
Enable file integrity monitoring on the wp-content/plugins/ directory to detect tampering

bash

# Configuration example: disable the plugin via WP-CLI
wp plugin deactivate wp-photo-album-plus
wp plugin delete wp-photo-album-plus

# Verify installed plugin versions
wp plugin list --fields=name,status,version | grep wp-photo-album-plus