Is CVE-2026-4300 actively exploited?

No active exploitation of CVE-2026-4300 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-4300 be exploited remotely?

Yes. CVE-2026-4300 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-4300?

CVE-2026-4300 has a CVSS score of 6.4 (MEDIUM).

HOME VULNERABILITIESCVE-2026-4300

MEDIUM

CVE-2026-4300

CWE-79Published: April 8, 2026· Updated: Apr 8, 2026

6.4

CVSS v3.1

EPSS:0.04%probability of exploitation in 30 daysPercentile:11.1th

Official Description

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.

NVD Source

Technical Analysis

CVE-2026-4300 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.

From a weakness classification perspective (CWE-79): Cross-site scripting (XSS) vulnerabilities allow attackers to inject malicious scripts into web pages viewed by other users.