WP ImageViewer <= 3.0.2 — Authenticated (Subscriber+) Stored DOM-Based Cross-Site Scripting via Image 'alt' Attribute

Am I affected?

• Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under WP ImageViewer.
• No admin access? Run a passive check of your site. It reads public files only.

What to do

1. Update to version 3.0.3, or a newer patched version
2. Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
3. Watch WP ImageViewer to get an email when the next vulnerability is published.

Advisory

Source description from Wordfence Intelligence, credited to Adrien Brunner.

The WP ImageViewer plugin for WordPress is vulnerable to Stored DOM-Based Cross-Site Scripting via the 'img.alt' parameter in all versions up to, and including, 3.0.2 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with subscriber-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This requires a front-end content plugin such as bbPress to be active, as it grants Subscriber-level users the bbp_participant capability needed to publish image-bearing content containing the encoded payload. Exploitation by attackers with contributor-level access and above requires that the site allows Contributors (or higher) to submit image HTML in post content — the WordPress default. On a default installation, where that is not configured, the vulnerability requires attackers with custom-level access and above.

Exploits & references

Proof-of-concept & detection

No public proof-of-concept or detection template is known for this vulnerability.

Advisories & patches

• Advisorywordfence.com

Related CVEs

Timeline

1. Nov 6, 2026

   CVE published

   Severity medium, CVSS 6.4

2. Nov 13, 2026

   Record last updated