CVE-2026-105887 Overview
CVE-2026-105887 is a stored Cross-Site Scripting (XSS) vulnerability in the Robosoft Robo Gallery plugin for WordPress. The flaw affects all versions of robo-gallery from unspecified early releases through 5.1.6. Authenticated attackers can inject persistent JavaScript payloads that execute in the browsers of users who view the affected gallery pages. The vulnerability is classified under CWE-79, Improper Neutralization of Input During Web Page Generation.
Critical Impact
Stored XSS enables session hijacking, administrative action abuse, and redirection to attacker-controlled infrastructure through persistent payloads delivered to any site visitor.
Affected Products
- Robosoft Robo Gallery WordPress plugin (robo-gallery)
- All versions from initial release through 5.1.6
- WordPress sites with the plugin installed and active
Discovery Timeline
- 2026-10-08 - CVE-2026-105887 published to NVD
- 2026-10-08 - Last updated in NVD database
Technical Details for CVE-2026-105887
Vulnerability Analysis
The Robo Gallery plugin fails to properly neutralize user-supplied input before rendering it in generated web pages. Attackers with low-privilege authenticated access can submit crafted input containing JavaScript. The plugin stores this input and later renders it to other users, including administrators, without adequate encoding or sanitization.
Because the payload is persisted server-side, every subsequent request to the affected page re-executes the malicious script. The scope change in the CVSS vector indicates the exploit crosses a trust boundary, allowing injected code to act on behalf of victims across the WordPress site. User interaction is required, but typical administrative workflows such as reviewing gallery content satisfy that condition.
Root Cause
The root cause is missing or insufficient output encoding in one or more plugin components that render gallery metadata, titles, descriptions, or configuration fields. Input accepted through authenticated plugin interfaces is written to the WordPress database and later echoed into HTML context without escaping functions such as esc_html(), esc_attr(), or wp_kses().
Attack Vector
Exploitation requires network access to the WordPress admin interface and authenticated access at a contributor-level or higher role. The attacker submits a gallery entry containing a script payload embedded in an unsanitized field. When another user, typically an administrator, loads the page containing the stored payload, the browser executes the injected JavaScript in the context of the WordPress origin.
The vulnerability can be chained with session theft, forced actions through the WordPress REST API, or plugin-based privilege escalation. See the Patchstack Vulnerability Report for additional context.
Detection Methods for CVE-2026-105887
Indicators of Compromise
- Gallery entries containing <script> tags, javascript: URIs, or HTML event handlers such as onerror= and onload=
- Unexpected outbound requests from administrator browsers to unfamiliar domains following gallery page views
- New or modified WordPress administrator accounts created shortly after authenticated gallery edits
- Suspicious entries in wp_posts or plugin-specific tables containing encoded script fragments
Detection Strategies
- Review WordPress audit logs for gallery creation or modification events by low-privilege accounts
- Scan the database for stored HTML and JavaScript patterns within Robo Gallery content fields
- Inspect rendered gallery pages with a headless browser to detect script execution from stored content
- Monitor web server access logs for POST requests to Robo Gallery admin endpoints followed by GET requests triggering script execution
Monitoring Recommendations
- Enable Content Security Policy (CSP) reporting to capture script-src violations originating from gallery pages
- Alert on creation of new administrator accounts or role changes immediately after plugin interactions
- Track outbound connections from browsers used by WordPress administrators to detect data exfiltration
How to Mitigate CVE-2026-105887
Immediate Actions Required
- Update the Robo Gallery plugin to a version later than 5.1.6 once the vendor publishes a fix
- Audit existing gallery entries for stored HTML or script content and remove suspicious payloads
- Review user roles and remove unnecessary contributor-level or higher privileges from untrusted accounts
- Rotate administrator session cookies and credentials if exploitation is suspected
Patch Information
At the time of publication, the vulnerability affects Robo Gallery through version 5.1.6. Monitor the Patchstack advisory and the official plugin repository for a patched release. Apply the vendor update as soon as it becomes available.
Workarounds
- Deactivate and remove the Robo Gallery plugin until a patched version is released
- Deploy a Web Application Firewall (WAF) rule blocking requests containing script tags or event handler attributes to plugin endpoints
- Enforce a strict Content Security Policy that disallows inline scripts on WordPress admin and gallery pages
- Restrict plugin configuration access to trusted administrators only
# Example CSP header to mitigate stored XSS execution
Header set Content-Security-Policy "default-src 'self'; script-src 'self'; object-src 'none'; base-uri 'self'; frame-ancestors 'self'"
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
