Medium severity · published Mar 11, 2026
CVE-2026-3534
Astra <= 4.12.3 - Authenticated (Contributor+) Stored Cross-Site Scripting via Post Meta
6.4
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 11% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AS
Astra · brainstormforce
through 4.12.3 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-3534
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-3534
themes.trac.wordpress.org
https://themes.trac.wordpress.org/browser/astra/4.12.3/inc/core/common-functions.php#L1629
themes.trac.wordpress.org
https://themes.trac.wordpress.org/browser/astra/4.12.3/inc/core/common-functions.php#L1640
themes.trac.wordpress.org
https://themes.trac.wordpress.org/browser/astra/4.12.3/inc/metabox/class-astra-meta-boxes.php#L1380
themes.trac.wordpress.org
https://themes.trac.wordpress.org/browser/astra/4.12.3/inc/metabox/class-astra-meta-boxes.php#L1386
themes.trac.wordpress.org
https://themes.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&new=316958%40astra%2F4.12.4&old=312219%40astra%2F4.12.3
www.wordfence.com
https://www.wordfence.com/threat-intel/vulnerabilities/id/acf2906b-1ee5-4272-bf6d-36a02023f658?source=cve
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