WP ImageViewer <= 3.0.2 - Authenticated (Contributor+) Stored Cross-Site Scripting via Image Alt Text
- ID
- WPSEC-2026-2728
- Plugin
- WP ImageViewer (wp-imageviewer)
- Affected
- all versions before 3.0.3
- Remediation
- Update to 3.0.3 or later.
- CVSS 3.1
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
- Weakness
- CWE-79
- Usage
- Plugin Low · Affected versions Low among sites WPSec scans, 2026-11-07
- Attack surface
- WP ImageViewer on WPSec AttackSurface
- Fix released
- Published
Description
The WP ImageViewer plugin for WordPress is vulnerable to Stored Cross-Site Scripting via image alt text in all versions up to, and including, 3.0.2. This is due to the viewer's front-end JavaScript reading an image's alt attribute, which the browser has already entity-decoded, and writing it into the viewer's description with innerHTML instead of inserting it as text. This makes it possible for authenticated attackers, with contributor-level access and above, to put an image linked to an image file in a post with an alt attribute holding entity-encoded HTML. That markup survives content filtering and injects arbitrary web scripts that execute in a user's browser when the image is opened in the viewer.
References
- https://wpsec.com/vuln/WPSEC-2026-2728/
- https://plugins.svn.wordpress.org/wp-imageviewer/tags/3.0.3/
- https://wordpress.org/plugins/wp-imageviewer/
Published by WPSec. Provided as is, without warranty. Corrections: contact us.
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