Brainstorm Force · Astra · CVE-2026-3534
**Name of the Vulnerable Software and Affected Versions**
Astra theme for WordPress versions through 4.12.3
**Description**
The Astra theme for WordPress is susceptible to Stored Cross-Site Scripting through the `ast-page-background-meta` and `ast-content-background-meta` post meta fields. This is caused by inadequate input sanitization during meta registration and a lack of output escaping within the `astra get responsive background obj()` function. Specifically, the function fails to properly escape four CSS-context sub-properties: `background-color`, `background-image`, `overlay-color`, and `overlay-gradient`. Authenticated attackers with Contributor-level access or higher can inject malicious web scripts into pages. These scripts will then execute whenever a user accesses the compromised page. The vulnerable function is `astra get responsive background obj()`.
**Recommendations**
Update the Astra theme to a version beyond 4.12.3.