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TI-2026-04189 Aliases CVE-2026-4804GHSA-vwhw-cgc3-f4mh

Zakra <= 4.2.0 - Authenticated (Contributor+) Stored Cross-Site Scripting via Post Meta REST API

Priority LOW 28CWE-79Published · Updated

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 Zakra theme for WordPress is vulnerable to Stored Cross-Site Scripting via post meta values in all versions up to, and including, 4.2.0. This is due to the theme registering three post meta fields (zakra_menu_item_color, zakra_menu_item_hover_color, and zakra_menu_item_active_color) with 'show_in_rest' => true and 'auth_callback' => '__return_true', but without any sanitize_callback parameter in the register_post_meta() calls. While the classic editor save path applies sanitize_hex_color() sanitization, the REST API path completely bypasses this protection. The unsanitized meta values are then retrieved via get_post_meta() and concatenated directly into CSS strings that are output through wp_add_inline_style() without any escaping. 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 the injected page.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00283 20th 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
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

VendorProductAffected versionsFixed inStatusSource
ThemeGrillZakraup to 4.2.0—No fix listedCNA
  • Zakra VendorThemeGrill Affected up to 4.2.0 Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-4804
  2. 2026-10-03 Alias added: GHSA-vwhw-cgc3-f4mh

References

Other 2

  • TI-2024-16396 WordPress LMS by Masteriyo plugin <= 1.7.2 - Privilege Escalation vulnerability CVSS 3.1CRITICAL 9.8
  • TI-2026-51986 WordPress Masteriyo - LMS plugin <= 2.3.2 - Arbitrary File Upload vulnerability CVSS 3.1CRITICAL 9.8
  • TI-2026-39610 WordPress Registration Form for WooCommerce plugin <= 1.0.9 - Privilege Escalation vulnerability CVSS 3.1CRITICAL 9.8
  • TI-2026-86554 Privilege escalation in Registration Form for WooCommerce checkout CVSS 3.1CRITICAL 9.8
  • TI-2020-18616 themegrill-demo-importer before 1.6.2 does not require authentication for wiping the… CVSS 3.1CRITICAL 9.1
  • TI-2020-18972 ThemeGrill Demo Importer 1.3.4 - 1.6.1 - Authorization Bypass to Site Reset CVSS 3.1CRITICAL 9.9
See all 46 →

Sources

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