Administrator field modification via disabled CSRF validation
Published Jun 15, 2026 · Updated Jun 15, 2026
Cross-site request forgery in henrikmelin More Fields 2.1 allows attackers to add or delete custom fields through an administrator's session. The plugin disables CSRF token validation for its add-box and delete-box functions, so options-general.php accepts forged POST and GET requests. A logged-in administrator must open the attacker-controlled page; the resulting requests can alter any number of extra fields and boxes on the Write/Edit page.
Summary
What happened
Cross-site request forgery in henrikmelin More Fields 2.1 allows attackers to add or delete custom fields through an administrator's session. The plugin disables CSRF token validation for its add-box and delete-box functions, so options-general.php accepts forged POST and GET requests. A logged-in administrator must open the attacker-controlled page; the resulting requests can alter any number of extra fields and boxes on the Write/Edit page.
The record
- CVE
- CVE-2016-20083
- Published
- Jun 15, 2026
- Updated
- Jun 15, 2026
- Vendor
- henrikmelin
- Product
- More Fields
- Classifications
- CWE-352, CAPEC-62, T1204.001
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 15, 2026CVE publishedPublication date reported by the CVE source.
- Jun 15, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=2.1
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- WordPress Plugin More Fields 2.1 Cross-Site Request Forgery PoCproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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