CVE-2026-2878— Insufficient Entropy Vulnerability in Telerik UI for ASP.NET AJAX
Quick assessment
Affected
Progress Software Telerik UI for ASP.NET AJAX
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.
Progress Telerik UI是美国Progress公司的一款用于应用程序开发的UI（用户界面）控件套件。 Progress Telerik UI for AJAX 2026.1.225之前版本存在安全特征问题漏洞，该漏洞源于RadAsyncUpload组件熵不足，可能导致文件内容篡改。
Possible ATT&CK Techniques 1 AI
T1557.001 · Name Resolution Poisoning and SMB Relay
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I. Basic Information for CVE-2026-2878
Vulnerability Information
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Vulnerability Title
Insufficient Entropy Vulnerability in Telerik UI for ASP.NET AJAX
Source: CVE Program / CVE List V5
Vulnerability Description
In Progress® Telerik® UI for AJAX, versions prior to 2026.1.225, an insufficient entropy vulnerability exists in RadAsyncUpload, where a predictable temporary identifier, based on timestamp and filename, can enable collisions and file content tampering.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息熵不充分
Source: CVE Program / CVE List V5
Vulnerability Title
Progress Telerik UI 安全特征问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Progress Telerik UI是美国Progress公司的一款用于应用程序开发的UI（用户界面）控件套件。 Progress Telerik UI for AJAX 2026.1.225之前版本存在安全特征问题漏洞，该漏洞源于RadAsyncUpload组件熵不足，可能导致文件内容篡改。
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 |
|---|---|---|---|---|
| Progress Software | Telerik UI for ASP.NET AJAX | 2011.2.712 ~ 2026.1.225 | - |
|
II. Public POCs for CVE-2026-2878
| # | POC Description | Source Link | Shenlong Link |
|---|
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IV. Related Vulnerabilities
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CVE-2026-13192
RadEditor PDF Export SSRF Vulnerability in Telerik UI for AS
Same vendor: Progress Software
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CVE-2026-80462
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CVE-2026-19219
DialogHandler UploadPaths Tampering Vulnerability in Telerik -
CVE-2026-18672
RadImageEditor ClientState Unauthenticated Arbitrary File Re
V. Comments for CVE-2026-2878
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