{"id":"CVE-2026-4300","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-4300","generatedAt":"2026-10-28T04:45:38.226Z","title":"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.","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.","published":"2026-04-08T10:16:02.000Z","lastModified":"2026-07-24T20:10:00.000Z","status":"Deferred","sourceIdentifier":"security@wordfence.com","cvss":{"version":"3.1","score":6.4,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N"},"cwe":["CWE-79"],"affected":[],"epss":{"score":0.00429,"percentile":0.36928,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.43%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"https://plugins.trac.wordpress.org/browser/robo-gallery/tags/5.1.3/includes/frontend/modules/base-grid/grid/grid.v1.php#L89","source":"security@wordfence.com"},{"url":"https://plugins.trac.wordpress.org/browser/robo-gallery/tags/5.1.3/includes/frontend/modules/base-grid/layout.v1.php#L101","source":"security@wordfence.com"},{"url":"https://plugins.trac.wordpress.org/browser/robo-gallery/tags/5.1.3/includes/frontend/modules/base-grid/layout.v1.php#L52","source":"security@wordfence.com"},{"url":"https://plugins.trac.wordpress.org/browser/robo-gallery/tags/5.1.3/includes/frontend/modules/class/jsoptions.php#L87","source":"security@wordfence.com"},{"url":"https://plugins.trac.wordpress.org/browser/robo-gallery/tags/5.1.3/includes/frontend/modules/class/jsoptions.php#L97","source":"security@wordfence.com"},{"url":"https://plugins.trac.wordpress.org/browser/robo-gallery/tags/5.1.3/includes/options/rbs_gallery_options_loading.php#L95","source":"security@wordfence.com"},{"url":"https://plugins.trac.wordpress.org/browser/robo-gallery/trunk/includes/frontend/modules/base-grid/grid/grid.v1.php#L89","source":"security@wordfence.com"},{"url":"https://plugins.trac.wordpress.org/browser/robo-gallery/trunk/includes/frontend/modules/base-grid/layout.v1.php#L101","source":"security@wordfence.com"},{"url":"https://plugins.trac.wordpress.org/browser/robo-gallery/trunk/includes/frontend/modules/base-grid/layout.v1.php#L52","source":"security@wordfence.com"},{"url":"https://plugins.trac.wordpress.org/browser/robo-gallery/trunk/includes/frontend/modules/class/jsoptions.php#L87","source":"security@wordfence.com"},{"url":"https://plugins.trac.wordpress.org/browser/robo-gallery/trunk/includes/frontend/modules/class/jsoptions.php#L97","source":"security@wordfence.com"},{"url":"https://plugins.trac.wordpress.org/browser/robo-gallery/trunk/includes/options/rbs_gallery_options_loading.php#L95","source":"security@wordfence.com"},{"url":"https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3488182%40robo-gallery&new=3488182%40robo-gallery&sfp_email=&sfph_mail=","source":"security@wordfence.com"},{"url":"https://www.wordfence.com/threat-intel/vulnerabilities/id/d8693b7d-693f-450a-89ef-e936a8813ca9?source=cve","source":"security@wordfence.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-4300","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}