CVE-2026-3534 Astra <= 4.12.3 - Authenticated (Contributor+) Stored Cross-Site Scripting via Post Meta
Authenticated attackers with Contributor access can inject arbitrary scripts via post meta fields, 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-2026-3534?
CVE-2026-3534 is a medium-severity cross-site scripting vulnerability in brainstormforce Astra, published on 11 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The Astra theme for WordPress is vulnerable to Stored Cross-Site Scripting via the `ast-page-background-meta` and `ast-content-background-meta` post meta fields in all versions up to, and including, 4.12.3. This is due to insufficient input sanitization on meta registration and missing output escaping in the `astra_get_responsive_background_obj()` function for four CSS-context sub-properties (`background-color`, `background-image`, `overlay-color`, `overlay-gradient`). 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-2026-3534?
How do I fix CVE-2026-3534?
No fix has been published for CVE-2026-3534 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-2026-3534 being exploited?
There is no known exploitation of CVE-2026-3534 in the wild and no public exploit code.
Sources
Also known as GHSA-9c4x-wwxm-pww8.