TI-2026-84138 Aliases CVE-2026-120534 GHSA-v5v5-hmcv-q4fc

Code injection in Advanced Custom Fields: Extended PRO

MEDIUM 49CWE-434Published 2026-11-03 · Updated 2026-11-03

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-434.

Summary

The Advanced Custom Fields: Extended PRO plugin for WordPress by ACF Extended is affected up to and including 0.9.2.6. Insufficient validation of form configuration parameters in the render_field function lets unauthenticated remote attackers call arbitrary WordPress functions with controlled arguments. Exploitation requires either an administrator to enable the non-default shortcode_preview setting for the target form, or a server that lacks OpenSSL functions.

Written with Claude Haiku 5.5 from the sources below · 2026-11-03

Description from the CNA

The Advanced Custom Fields: Extended PRO plugin for WordPress is vulnerable to Limited Code Injection in all versions up to, and including, 0.9.2.6 via the render_field function. This is due to insufficient validation of form configuration parameters before merging into field settings and passing to call_user_func_array in the render_field method. This makes it possible for unauthenticated attackers to call arbitrary WordPress functions with controlled arguments. Method 1 requires the administrator to enable the non-default 'shortcode_preview' setting for the target form, while Method 2 requires the server environment to lack OpenSSL functions, causing ACF Pro's acf_decrypt to fall back to unverified base64 decoding.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00312 24th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Total

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
ACF Extended	Advanced Custom Fields: Extended PRO	up to 0.9.2.6	—	No fix listed	CNA

Advanced Custom Fields: Extended PRO VendorACF Extended Affected up to 0.9.2.6 Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for Advanced Custom Fields: Extended PRO.

Written with Claude Haiku 5.5 from the sources below · 2026-11-03

Timeline

2026-11-03 Threatist record created from CVE-2026-120534
2026-11-03 Alias added: GHSA-v5v5-hmcv-q4fc
2026-11-03 CISA SSVC decision points changed

References

Other 2

TI-2026-79236 Missing authorization in WordPress ACF Extended plugin CVSS 3.1HIGH 7.5
TI-2026-79235 Path traversal in WordPress ACF Extended lets attackers delete files CVSS 3.1MEDIUM 6.5
TI-2021-07147 Advanced Custom Fields: Extended < 0.8.8.7 - Admin+ SQL Injection CVSS 3.1HIGH 7.2
TI-2026-79249 Stored cross-site scripting in WordPress ACF Extended plugin CVSS 3.1HIGH 7.1
TI-2026-56123 WordPress ACF Extended plugin <= 0.9.2.6 - Broken Access Control vulnerability CVSS 3.1MEDIUM 4.3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences