CVE-2026-1646 Advance Block Extend <= 1.0.4 - Authenticated (Contributor+) Stored Cross-Site Scripting via TitleColor Block Attribute
Authenticated attackers can inject arbitrary scripts via the TitleColor attribute, leading to code execution when users view affected 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-2026-1646?
CVE-2026-1646 is a medium-severity cross-site scripting vulnerability in iamjaydip Advance Block Extend, published on 19 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The Advance Block Extend plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the TitleColor block attribute in the Latest Posts Gutenberg block in all versions up to, and including, 1.0.4 due to insufficient input sanitization and output escaping. 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-2026-1646?
How do I fix CVE-2026-1646?
No fix has been published for CVE-2026-1646 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-2026-1646 being exploited?
There is no known exploitation of CVE-2026-1646 in the wild and no public exploit code.
Sources
Also known as GHSA-89v4-vh9p-rj53.