Astra <= 4.12.3 - Authenticated (Contributor+) Stored Cross-Site Scripting via Post Meta
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Brainstorm Force | Astra | up to 4.12.3 | — | No fix listed | CNA |
- Astra VendorBrainstorm Force Affected up to 4.12.3 Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2026-3534
- 2026-10-03 Alias added: GHSA-9c4x-wwxm-pww8
References
Other 6
- https://www.wordfence.com/threat-intel/vulnerabilities/id/acf2906b-1ee5-4272-bf6d-36a02023f658?source=cve
- https://themes.trac.wordpress.org/browser/astra/4.12.3/inc/core/common-functions.php#L1640
- https://themes.trac.wordpress.org/browser/astra/4.12.3/inc/core/common-functions.php#L1629
- https://themes.trac.wordpress.org/browser/astra/4.12.3/inc/metabox/class-astra-meta-boxes.php#L1386
- https://themes.trac.wordpress.org/browser/astra/4.12.3/inc/metabox/class-astra-meta-boxes.php#L1380
- https://themes.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&new=316958%40astra%2F4.12.4&old=312219%40astra%2F4.12.3
More Brainstorm Force vulnerabilities
- TI-2025-19878 WordPress SureTriggers <= 1.0.82 - Privilege Escalation Vulnerability CVSS 3.1CRITICAL 9.8
- TI-2025-02708 Incorrect comparison in Brainstorm Force OttoKit: All-in-One Automation Platform CVSS 3.1HIGH 8.1
- TI-2025-05347 SureForms < 1.7.2 - Reflected XSS CVSS 3.1MEDIUM 5.8
- TI-2020-18849 Spectra < 1.15.0 - Contributor+ Stored Cross-Side Scripting CVSS 3.1MEDIUM 5.4
- TI-2025-03050 SureForms < 1.4.4 - Contributor+ Settings Update CVSS 3.1MEDIUM 4.9
- TI-2025-11950 Starter Templates <= 4.4.41 - Authenticated (Author+) Arbitrary File Upload via WXR Upload Bypass CVSS 3.1HIGH 8.8
Sources
- CVE-2026-3534 · CVE Program
- CVE-2026-3534 · NVD
- FIRST EPSS
- GHSA-9c4x-wwxm-pww8 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences