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CVE-2026-10818— WPForms Pro <= 1.10.1.1 - Unauthenticated Arbitrary File Write via Chunked Upload Init/Finalize Ordering

Quick assessment

Affected
WPForms WPForms Pro
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WordPress WPForms Pro是WordPress基金会的一款CMS表单插件。 WordPress WPForms Pro 1.10.1.1版本存在任意文件上传漏洞，该漏洞源于ajax_chunk_upload_finalize函数中文件类型验证发生在块元数据和文件内容写入磁盘之后，且组装文件在验证失败时未被删除，可能导致未认证攻击者上传可执行文件，实现远程代码执行。

CVSS 8.1 · High EPSS 2.48% · P84

Affected Version Matrix 1

VendorProduct Version RangeStatus
WPForms WPForms Pro ≤ 1.10.1.1 affected
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I. Basic Information for CVE-2026-10818

Vulnerability Information
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Vulnerability Title
WPForms Pro <= 1.10.1.1 - Unauthenticated Arbitrary File Write via Chunked Upload Init/Finalize Ordering
Source: CVE Program / CVE List V5
Vulnerability Description
The WPForms Pro plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 1.10.1.1 via the ajax_chunk_upload_finalize function. This is due to the file type validation occurring after chunk metadata and file contents have already been written to disk, and the assembled file not being deleted upon validation failure. This makes it possible for unauthenticated attackers to upload files that may be executable, which makes remote code execution possible.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
危险类型文件的不加限制上传
Source: CVE Program / CVE List V5
Vulnerability Title
WordPress WPForms Pro 任意文件上传漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress WPForms Pro是WordPress基金会的一款CMS表单插件。 WordPress WPForms Pro 1.10.1.1版本存在任意文件上传漏洞，该漏洞源于ajax_chunk_upload_finalize函数中文件类型验证发生在块元数据和文件内容写入磁盘之后，且组装文件在验证失败时未被删除，可能导致未认证攻击者上传可执行文件，实现远程代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
WPForms WPForms Pro 0 ~ 1.10.1.1 -

II. Public POCs for CVE-2026-10818

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III. Intelligence Information for CVE-2026-10818

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Vendor Advisories for CVE-2026-10818 (1)

Vendor Pages for CVE-2026-10818 (1)

IV. Related Vulnerabilities

Same product: WPForms Pro
Same vendor: WPForms
Same weakness: CWE-434

V. Comments for CVE-2026-10818

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