Unauthenticated code execution via persistent chunk upload
Published Jul 25, 2026 · Updated Jul 25, 2026
Arbitrary file upload in WPForms Pro 1.10.1.1 and earlier allows remote attackers to write executable files through public AJAX requests. The ajax_chunk_upload_finalize workflow writes chunk metadata and contents before file-type validation and retains the assembled file when validation fails. No authentication or user interaction is required; code execution follows only when the retained file is reachable and handled as executable by the server.
Summary
What happened
Arbitrary file upload in WPForms Pro 1.10.1.1 and earlier allows remote attackers to write executable files through public AJAX requests. The ajax_chunk_upload_finalize workflow writes chunk metadata and contents before file-type validation and retains the assembled file when validation fails. No authentication or user interaction is required; code execution follows only when the retained file is reachable and handled as executable by the server.
The record
- CVE
- CVE-2026-10818
- Published
- Jul 25, 2026
- Updated
- Jul 25, 2026
- Vendor
- WPForms
- Product
- WPForms Pro
- Classifications
- CWE-434, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 25, 2026CVE publishedPublication date reported by the CVE source.
- Jul 25, 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=0 <=1.10.1.1
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
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
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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