Custom CSS, JS & PHP <= 2.0.7 - Cross-Site Request Forgery Bypass
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Tampering
- Confidentiality · integrity · availability
- None · Low · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-352.
Summary
The Custom CSS, JS & PHP plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 2.0.7. This is due to missing or incorrect nonce validation on the save() function. This makes it possible for unauthenticated attackers to save code snippets via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.
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 |
|---|---|---|---|---|---|
| flippercode | Custom css-js-php | up to 2.0.7 | — | No fix listed | CNA |
- Custom css-js-php Vendorflippercode Affected up to 2.0.7 Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-4418
- 2026-10-03 Alias added: GHSA-j98c-6x58-jmvw
References
Patch 1
Other 6
- https://blog.nintechnet.com/25-wordpress-plugins-vulnerable-to-csrf-attacks/
- https://blog.nintechnet.com/more-wordpress-plugins-and-themes-vulnerable-to-csrf-attacks/
- https://blog.nintechnet.com/multiple-wordpress-plugins-fixed-csrf-vulnerabilities-part-3/
- https://blog.nintechnet.com/multiple-wordpress-plugins-fixed-csrf-vulnerabilities-part-1/
- https://blog.nintechnet.com/multiple-wordpress-plugins-fixed-csrf-vulnerabilities-part-5/
- https://blog.nintechnet.com/multiple-wordpress-plugins-fixed-csrf-vulnerabilities-part-4/
More flippercode vulnerabilities
- TI-2026-07674 Missing authentication in flippercode WP Maps Pro CVSS 3.1CRITICAL 9.8
- TI-2021-03243 WP Security Question <= 1.0.5 - Cross-Site Request Forgery Bypass CVSS 3.1MEDIUM 4.3
- TI-2025-11060 WP Maps <= 4.8.6 - Authenticated (Subscriber+) Limited Local File Inclusion CVSS 3.1HIGH 8.8
- TI-2024-02217 WordPress Plugin for Google Maps – WP MAPS <= 4.6.1 - Authenticated (Contributor+) SQL Injection CVSS 3.1HIGH 8.8
- TI-2023-12741 WordPress WP Google Map Plugin Plugin <= 4.4.2 is vulnerable to Cross Site Request Forgery (CSRF) CVSS 3.1HIGH 8.8
- TI-2026-02785 WP Maps <= 4.9.1 - Unauthenticated SQL Injection via 'location_id' Parameter CVSS 3.1HIGH 7.5
Sources
- CVE-2021-4418 · CVE Program
- CVE-2021-4418 · NVD
- FIRST EPSS
- GHSA-j98c-6x58-jmvw · 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