robosoft Robo Gallery Plugin up to 5.1.3 on WordPress Setting fixJsFunction cross site scripting

Summaryinfo

A vulnerability categorized as problematic has been discovered in robosoft Robo Gallery Plugin up to 5.1.3 on WordPress. The impacted element is the function fixJsFunction of the component Setting Handler. The manipulation results in cross site scripting. This vulnerability is cataloged as CVE-2026-4300. The attack may be launched remotely. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in robosoft Robo Gallery Plugin up to 5.1.3 on WordPress. It has been classified as problematic. Affected is the function fixJsFunction of the component Setting Handler. The manipulation with an unknown input leads to a cross site scripting vulnerability. CWE is classifying the issue as CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. This is going to have an impact on integrity. CVE summarizes:

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 `` 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.

The weakness was shared by Athiwat Tiprasaharn. The advisory is available at wordfence.com. This vulnerability is traded as CVE-2026-4300 since 03/16/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1059.007 by the MITRE ATT&CK project.

Upgrading to version 5.1.3 eliminates this vulnerability.

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Productinfo

Type

• Photo Gallery Software

Vendor

• robosoft

Name

• Robo Gallery Plugin

Version

• 5.1.0
• 5.1.1
• 5.1.2
• 5.1.3

CPE 2.3info

• 🔒
• 🔒
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CPE 2.2info

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• 🔒
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