CVE-2026-5920 Bold Page Builder <= 5.9.6 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'shortcode_content' Parameter
Authenticated attackers can inject arbitrary scripts via the shortcode_content parameter, leading to stored XSS execution on victim pages.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-5920?
CVE-2026-5920 is a medium-severity cross-site scripting vulnerability in boldthemes Bold Page Builder, published on 16 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The Bold Page Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'shortcode_content' parameter of the bt_bb_shortcode shortcode in all versions up to, and including, 5.9.6. This is due to a bypassable security filter (bt_bb_save_pre) that can be circumvented via null byte injection, combined with insufficient output sanitization of base64-decoded content in the bt_bb_raw_content shortcode handler. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
Weakness: CWE-79
Which versions are affected by CVE-2026-5920?
How do I fix CVE-2026-5920?
No fix has been published for CVE-2026-5920 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-5920 being exploited?
There is no known exploitation of CVE-2026-5920 in the wild and no public exploit code.
Sources
Also known as GHSA-8q43-cjqx-vmj9.