Cross-site scripting in Justin Kruit Advanced Custom Fields: Font Awesome Field
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 Advanced Custom Fields: Font Awesome plugin for WordPress is vulnerable to Stored Cross-Site Scripting in versions up to and including 5.0.2. This is due to insufficient input validation of JSON field values and unsafe client-side HTML construction in the update_preview() JavaScript function. This makes it possible for authenticated attackers, with Subscriber-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 |
|---|---|---|---|---|---|
| Justin Kruit | Advanced Custom Fields: Font Awesome Field | up to 5.0.2 | — | No fix listed | CNA |
- Advanced Custom Fields: Font Awesome Field VendorJustin Kruit Affected up to 5.0.2 Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2026-6415
- 2026-10-03 Alias added: GHSA-59fm-cmjw-gc79
References
Other 6
- https://www.wordfence.com/threat-intel/vulnerabilities/id/a7a53ba2-e983-4821-b3de-105a96b7cb0e?source=cve
- https://plugins.trac.wordpress.org/browser/advanced-custom-fields-font-awesome/trunk/assets/js/input-v6.js#L11
- https://plugins.trac.wordpress.org/browser/advanced-custom-fields-font-awesome/tags/5.0.2/assets/js/input-v6.js#L11
- https://plugins.trac.wordpress.org/browser/advanced-custom-fields-font-awesome/trunk/assets/js/input-v6.js#L12
- https://plugins.trac.wordpress.org/browser/advanced-custom-fields-font-awesome/tags/5.0.2/assets/js/input-v6.js#L12
- https://plugins.trac.wordpress.org/changeset/3525840/
More Justin Kruit vulnerabilities
- TI-2026-36270 WordPress Advanced Custom Fields: Font Awesome Field plugin <= 5.0.2 - Cross Site Scripting (XSS) vulnerability CVSS 3.1MEDIUM 6.5
- TI-2026-47346 WordPress Advanced Custom Fields: Font Awesome Field plugin <= 6.1.1 - Broken Access Control vulnerability CVSS 3.1MEDIUM 4.3
Sources
- CVE-2026-6415 · CVE Program
- CVE-2026-6415 · NVD
- FIRST EPSS
- GHSA-59fm-cmjw-gc79 · 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