CVE-2026-4300
MediumCVSS 6.4Exploitation Probability (EPSS)
Low risk35th percentile - higher than 35% of all known CVEs
Summary
The Robo Gallery plugin for WordPress up to version 5.1.3 is vulnerable to Stored Cross-Site Scripting via the 'Loading Label' setting. The plugin uses a `|***...***|` marker pattern to embed raw JavaScript code within JSON configuration objects. Authenticated attackers with Author-level access can inject arbitrary scripts that execute whenever a page with the gallery is viewed.
Risk Assessment
The organization is at risk of XSS attacks, which could lead to session hijacking, website defacement, or other malicious actions in the victim's browser context.
Recommendation
Update the Robo Gallery plugin to version 5.1.4 or later, which contains the fix.
Original NVD description (English source)
The Robo Gallery plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'Loading Label' setting in all versions up to, and including, 5.1.3. The plugin uses a custom `|***...***|` marker pattern in its `fixJsFunction()` method to embed raw JavaScript function references within JSON-encoded configuration objects. When a gallery's options are rendered on the frontend, `json_encode()` wraps all string values in double quotes. The `fixJsFunction()` method then strips the `"|***` and `***|"` sequences, effectively converting a JSON string value into raw JavaScript code. The Loading Label field (stored as `rbs_gallery_LoadingWord` post_meta) is an `rbstext` type field that is sanitized with `sanitize_text_field()` on save. While this strips HTML tags, it does not strip the `|***...***|` markers since they contain no HTML. When a user inputs `|***alert(document.domain)***|`, the value passes through sanitization intact, is stored in post_meta, and is later retrieved and output within an inline `<script>` tag via `renderMainBlock()` with the quote markers stripped — resulting in arbitrary JavaScript execution. The gallery post type uses `capability_type => 'post'`, allowing Author-level users to create galleries. This makes it possible for authenticated attackers, with Author-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses a page containing the gallery shortcode.