CVE-2026-2878 PUBLISHED

Insufficient Entropy Vulnerability in Telerik UI for ASP.NET AJAX

Assigner: ProgressSoftware
Reserved: 20.02.2026 Published: 25.02.2026 Updated: 25.02.2026

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.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N
CVSS Score: 5.3

Attack Vector	Network	Scope	Unchanged
Attack Complexity	High	Confidentiality Impact	None
Privileges Required	None	Integrity Impact	High
User Interaction	Required	Availability Impact	None

CVSS 3.1

Product Status

Vendor	Progress Software
Product	Telerik UI for ASP.NET AJAX
Versions	Default: unaffected affected from 2011.2.712 to 2026.1.225 (excl.)

Credits

Monetary Authority of Singapore finder

References

https://www.telerik.com/products/aspnet-ajax/documentation/knowledge-base/kb-security-insufficient-entropy-cve-2026-2878

Problem Types

CWE-331 Insufficient Entropy CWE

Impacts

CAPEC-149 Explore for Predictable Temporary File Names
CAPEC-26 Leveraging Race Conditions