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CVE-2026-16618— ImproveSEO <= 2.0.11 - Unauthenticated Arbitrary File Upload Leading to Remote Code Execution

Quick assessment

Affected
Unknown Improve SEO
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 Improve SEO是WordPress基金会开源的一款提升网站搜索引擎优化的CMS插件。 WordPress Improve SEO 2.0.11及之前版本存在任意文件上传漏洞，该漏洞源于未正确验证上传文件，仅检查文件内容类型并将文件以攻击者提供的扩展名写入公开可访问目录，可能导致未经身份验证的用户上传可执行PHP文件并实现远程代码执行。

AI Predicted 9.8 Difficulty: Trivial EPSS 0.83% · P58

Affected Version Matrix 1

VendorProduct Version RangeStatus
Unknown Improve SEO ≤ 2.0.11 affected
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I. Basic Information for CVE-2026-16618

Vulnerability Information
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Vulnerability Title
ImproveSEO <= 2.0.11 - Unauthenticated Arbitrary File Upload Leading to Remote Code Execution
Source: CVE Program / CVE List V5
Vulnerability Description
The Improve SEO WordPress plugin through 2.0.11 does not properly validate uploaded files, checking only the file content type while writing the file with the attacker-supplied extension into a publicly accessible directory, allowing unauthenticated users to upload executable PHP files and achieve remote code execution.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
WordPress Improve SEO 任意文件上传漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress Improve SEO是WordPress基金会开源的一款提升网站搜索引擎优化的CMS插件。 WordPress Improve SEO 2.0.11及之前版本存在任意文件上传漏洞，该漏洞源于未正确验证上传文件，仅检查文件内容类型并将文件以攻击者提供的扩展名写入公开可访问目录，可能导致未经身份验证的用户上传可执行PHP文件并实现远程代码执行。
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
Unknown Improve SEO 0 ~ 2.0.11 -

II. Public POCs for CVE-2026-16618

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III. Intelligence Information for CVE-2026-16618

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Vendor Advisories for CVE-2026-16618 (1)

Same Patch Batch · Unknown · 2026-08-04 · 24 CVEs total

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CVE-2026-10526 EmbedPress < 4.6.1 - Unauthenticated Blind SSRF
CVE-2026-11366 MonsterInsights < 11.1.0 - Unauthenticated Measurement Protocol Secret Update via Empty-Ke
CVE-2026-16536 Simple Google Calendar Outlook Events Widget < 3.1.0 - Unauthenticated SSRF via calendar_i
CVE-2026-16623 Create Block Theme < 2.10.0 - Admin+ PHP Code Injection via Pattern Save (Multisite)
CVE-2026-12698 wpForo Forum < 3.1.3 - Subscriber+ Account Status and Reputation Manipulation via Profile
CVE-2026-14939 Visualizer: Tables and Charts Manager < 4.0.6 - Contributor+ Server-Side Request Forgery v
CVE-2026-14816 The GDPR Framework < 2.4.0 - Unauthenticated Consent Record Forgery and Do Not Sell Reques
CVE-2026-14872 Database for Contact Form 7, WPforms, Elementor forms < 1.5.5 - Authenticated SQL Injectio
CVE-2026-14824 Quiz And Survey Master < 11.2.2 - Contributor+ Stored XSS via Polar Question
CVE-2026-14848 Paid Member Subscriptions < 3.0.8 - Subscriber+ Cross-User Subscription Hijack via process
CVE-2026-16035 miniOrange 2FA < 6.2.7 - Subscriber+ Arbitrary-Recipient OTP Send
CVE-2026-16296 Clearfy < 2.4.3 - Open Redirect via Cyrlitera 404 Handler
CVE-2026-15233 Nested Pages < 3.2.15 - Editor+ Stored XSS via Post Title
CVE-2026-15958 Easy Dropbox Integration < 2.2.0 - Unauthenticated Arbitrary Connected Dropbox File Access
CVE-2026-16293 Blubrry PowerPress < 11.16.11 - Contributor+ Stored XSS via Podcast Episode Chapters URL
CVE-2026-16068 Brizy - Page Builder < 2.8.19 - Author+ Stored XSS via brizy_set_project Global Project Co
CVE-2026-16069 Brizy - Page Builder < 2.8.19 - Contributor+ Stored XSS via Featured Image Focal Point
CVE-2026-16070 Brizy - Page Builder < 2.8.19 - Contributor+ Template Type Update via IDOR
CVE-2026-16548 Bit Assist < 1.8.2 - Unauthenticated Arbitrary File Upload via Response Endpoint

Showing top 20 of 24 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same vendor: Unknown