TI-2026-67878 Aliases CVE-2026-100506 GHSA-29vv-gx7g-vm7g

PHP object injection in WordPress WP Spell Check plugin

LOW 34CWE-502Published 2026-10-05 · Updated 2026-10-06

Key facts

Attack vector: Network
Privileges required: High
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-502.

Summary

The WP Spell Check plugin for WordPress is affected up to and including version 12.1. Deserialization of untrusted data (CWE-502) lets attackers inject PHP objects. A remote attacker with high privileges can exploit this, with high impact to confidentiality, integrity and availability.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

Deserialization of Untrusted Data vulnerability in WP Spell Check WP Spell Check wp-spell-check allows Object Injection.This issue affects WP Spell Check: from n/a through 12.1.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00359 29th 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: 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
WP Spell Check	WP Spell Check	up to 12.1	—	No fix listed	CNA

WP Spell Check VendorWP Spell Check Affected up to 12.1 Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for WP Spell Check.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Timeline

2026-10-05 Threatist record created from CVE-2026-100506
2026-10-06 Alias added: GHSA-29vv-gx7g-vm7g
2026-10-06 CISA SSVC decision points changed
2026-10-06 Priority changed: MEDIUM → LOW

References

Other 1

https://patchstack.com/database/wordpress/plugin/wp-spell-check/vulnerability/wordpress-wp-spell-check-plugin-12-1-php-object-injection-vulnerability?_s_id=cve

TI-2022-02458 WP Spell Check < 9.13 - Admin+ Stored Cross-Site Scripting CVSS 3.1MEDIUM 4.8
TI-2019-04316 Cross-site request forgery in WP Spell Check CVSS 3.1HIGH 8.8
TI-2024-14744 WordPress WP Spell Check Plugin <= 9.17 is vulnerable to Cross Site Request Forgery (CSRF) CVSS 3.1HIGH 8.8
TI-2025-18780 WordPress WP Spell Check plugin <= 9.21 - Cross Site Request Forgery (CSRF) vulnerability CVSS 3.1MEDIUM 5.4

Sources

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