Robo Gallery <= 5.1.3 - Authenticated (Author+) Stored Cross-Site Scripting via 'Loading Label' Setting

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Summary

CVECVE-2026-4300
StatePUBLISHED
AssignerWordfence
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-08 10:16:01 UTC
Updated2026-04-08 21:26:13 UTC
DescriptionThe 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.

Risk And Classification

Primary CVSS: v3.1 6.4 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

EPSS: 0.000370000 probability, percentile 0.111110000 (date 2026-04-09)

Problem Types: CWE-79 | CWE-79 CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary6.4MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
3.1CNADECLARED6.4MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Robosoft Robo Gallery Photo Image Slider affected 5.1.3 semver Not specified

References

ReferenceSourceLinkTags
plugins.trac.wordpress.org/browser/robo-gallery/trunk/includes/frontend/modules/class/js... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/robo-gallery/tags/5.1.3/includes/options/rbs_gallery_... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/robo-gallery/trunk/includes/frontend/modules/base-gri... [email protected] plugins.trac.wordpress.org
www.wordfence.com/threat-intel/vulnerabilities/id/d8693b7d-693f-450a-89ef-e936a... [email protected] www.wordfence.com
plugins.trac.wordpress.org/browser/robo-gallery/tags/5.1.3/includes/frontend/modules/bas... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/robo-gallery/trunk/includes/options/rbs_gallery_optio... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/robo-gallery/tags/5.1.3/includes/frontend/modules/bas... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/robo-gallery/trunk/includes/frontend/modules/class/js... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/robo-gallery/tags/5.1.3/includes/frontend/modules/cla... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/robo-gallery/trunk/includes/frontend/modules/base-gri... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/robo-gallery/trunk/includes/frontend/modules/base-gri... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/changeset [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/robo-gallery/tags/5.1.3/includes/frontend/modules/bas... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/robo-gallery/tags/5.1.3/includes/frontend/modules/cla... [email protected] plugins.trac.wordpress.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Athiwat Tiprasaharn (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-03-17T07:47:22.000ZVendor Notified
CNA2026-04-07T21:02:36.000ZDisclosed
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