CVE-2025-9378 Vayu Blocks <= 1.3.9 - Authenticated (Contributor+) Stored Cross-Site Scripting via Multiple Block Attributes
Authenticated attackers with Contributor access can inject arbitrary scripts via Lottie block attributes, 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-2025-9378?
CVE-2025-9378 is a medium-severity cross-site scripting vulnerability in themehunk Vayu Blocks – Website Builder for the Block Editor, published on 3 Sep 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The Vayu Blocks – Website Builder for the Block Editor plugin for WordPress is vulnerable to Stored Cross-Site Scripting via multiple attributes in the Lottie block in all versions up to, and including, 1.3.9 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-2025-9378?
How do I fix CVE-2025-9378?
No fix has been published for CVE-2025-9378 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-2025-9378 being exploited?
There is no known exploitation of CVE-2025-9378 in the wild and no public exploit code.