CVE-2026-5820 Zypento Blocks <= 1.0.6 - Authenticated (Author+) Stored Cross-Site Scripting via Table of Contents Block
Authenticated attackers can inject arbitrary scripts via the Table of Contents block, executing them for other users.
- 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-2026-5820?
CVE-2026-5820 is a medium-severity cross-site scripting vulnerability in sproutient Zypento Blocks, published on 22 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The Zypento Blocks plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the Table of Contents block in all versions up to, and including, 1.0.6. This is due to the front-end TOC rendering script reading heading text via `innerText` and inserting it into the page using `innerHTML` without proper sanitization. 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 an injected page.
Weakness: CWE-79
Which versions are affected by CVE-2026-5820?
How do I fix CVE-2026-5820?
No fix has been published for CVE-2026-5820 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-2026-5820 being exploited?
There is no known exploitation of CVE-2026-5820 in the wild and no public exploit code.
Sources
Also known as GHSA-qf7j-x97j-qhrf.