bbp style pack <= 6.4.5 — Authenticated (Subscriber+) Stored Cross-Site Scripting via Topic Form Additional Fields

Am I affected?

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

What to do

1. Update to version 6.4.6, or a newer patched version
2. Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
3. Watch bbp style pack to get an email when the next vulnerability is published.

Advisory

Source description from Wordfence Intelligence, credited to Catalin Oancea (0x4D5A).

The bbp Style Pack plugin for WordPress is vulnerable to Stored Cross-Site Scripting in versions up to, and including, 6.4.5 via the Topic Form Additional Fields feature. This is due to insufficient input sanitization in bsp_topic_fields_form_save() (which writes $_POST['bsp_topic_fields_label{n}'] directly to post meta via update_post_meta() with no filtering) and missing output escaping in bsp_topic_content_append_topic_fields() (which concatenates the stored meta value into an HTML <span> and echoes it via apply_filters/echo without esc_html()). This makes it possible for authenticated attackers, with Subscriber-level access and above (who have bbPress topic-creation privileges), to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page, including unauthenticated visitors.

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. Jul 10, 2026

   CVE published

   Severity medium, CVSS 6.4

2. Nov 13, 2026

   Record last updated