WP Spell Check <= 12.1 — Authenticated (Author+) PHP Object Injection
CVE-2026-100506Published · Updated Action summary
Affected: ≤12.1Update to 12.2 or newer
All remediation steps- Severity
- High7.5
- CVSS
- 7.5CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:HWhat does this vector mean?
AV:NAttack vector- Network
AC:HAttack complexity- High
PR:LPrivileges required- Low
UI:NUser interaction- None
S:UScope- Unchanged
C:HConfidentiality- High
I:HIntegrity- High
A:HAvailability- High
- Weakness
- CWE-502 PHP Object Injection
- Required access
- Unknown
- Exploit prediction (EPSS)
- 0.4% chance in 30 days30th percentile
- CISA KEV
- Not listed
On this page8
Am I affected?
WP Spell Check wp-spell-check
- Affected≤ 12.1
- Patched in12.2
Update to 12.2 or newer.
You are affected if you run ≤ 12.1. Version 12.2 and later are not affected by this issue.
- Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under WP Spell Check.
- No admin access? Run a passive check of your site. It reads public files only.
What to do
- Update to version 12.2, or a newer patched version
- Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
- Watch WP Spell Check to get an email when the next vulnerability is published.
Advisory
Source description from Wordfence Intelligence, credited to Ananda Dhakal.
The WP Spell Check plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 12.1. This is due to deserialization of untrusted input. This makes it possible for authenticated attackers, with author-level access and above, to inject a PHP Object. No known POP chain is present in the vulnerable software. If a POP chain is present via an additional plugin or theme installed on the target system, it could allow the attacker to delete arbitrary files, retrieve sensitive data, or execute code.
Exploits & references
Proof-of-concept & detection
No public proof-of-concept or detection template is known for this vulnerability.
Advisories & patches
- Advisorywordfence.com
Related CVEs
More in WP Spell Check
All 7| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| Medium4.3 | Cross-Site Request Forgery ≤9.21Update to 9.22 | CVE-2025-25111 | |
| Medium4.3 | Cross-Site Request Forgery ≤9.17Update to 9.18 | CVE-2024-22143 | |
| Medium5.4 | Cross-Site Request Forgery ≤9.12Update to 9.13 | — | |
| Medium5.5 | Authenticated (Admin+) Stored Cross-Site Scripting ≤9.12Update to 9.13 | CVE-2022-2658 | |
| Medium6.1 | Reflected Cross-Site Scripting <9.3Update to 9.3 | — |
- Medium4.3Cross-Site Request Forgery
≤9.21Update to 9.22
- Medium4.3Cross-Site Request Forgery
≤9.17Update to 9.18
- Medium5.4Cross-Site Request Forgery
≤9.12Update to 9.13
- Medium5.5Authenticated (Admin+) Stored Cross-Site Scripting
≤9.12Update to 9.13
- Medium6.1Reflected Cross-Site Scripting
<9.3Update to 9.3
Same weakness (PHP Object Injection)
All PHP Object Injection| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| High7.2 | Unauthenticated Stored Cross-Site Scripting via Comment User-Agent Header | CVE-2026-120688 | |
| Critical9.8 | Unauthenticated Arbitrary File Upload via File Upload via Public Form Submission | CVE-2026-125055 | |
| Critical9.8 | Unauthenticated PHP Object Injection to Remote Code Execution via 'form' Parameter | CVE-2026-119077 | |
| Medium5.3 | Unauthenticated Sensitive Information Exposure in 'search' Parameter | CVE-2026-121518 |
- High7.2Unauthenticated Stored Cross-Site Scripting via Comment User-Agent Header
EZ SQL Reports Shortcode Widget and DB Backup
≤5.25.25Update to 5.26.45
- Critical9.8Unauthenticated Arbitrary File Upload via File Upload via Public Form Submission
Chatterbug Forms – Fast, Flexible WordPress Form Builder
≤1.0.2Update to 1.1
- Critical9.8Unauthenticated PHP Object Injection to Remote Code Execution via 'form' Parameter
ELEX WordPress HelpDesk & Customer Ticketing System
≤3.3.9Update to 3.4.0
- Medium5.3Unauthenticated Sensitive Information Exposure in 'search' Parameter
Customer Reviews for WooCommerce
≤5.127.0Update to 5.128.0
Timeline
CVE published
Severity high, CVSS 7.5
Record last updated
Sources & licenses
Wordfence record- Vulnerability data
- Wordfence Intelligence. Copyright 2012-2026 Defiant Inc. Licensed under the CC BY-SA 4.0.
- CVE® identifiers
- Copyright 1999-2026 The MITRE Corporation. Used under the CVE Program. CVE® is a registered trademark of The MITRE Corporation.
- CVSS / CWE
- National Vulnerability Database (NVD), shown unmodified. This product uses the NVD API but is not endorsed or certified by the NVD.
- EPSS
- Exploit Prediction Scoring System by FIRST.org.
- VulnCrest content
- Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.