CVE-2026-2878mediumCWE-331

CVE-2026-2878: medium-severity vulnerability in Progress Software Telerik UI for ASP.NET AJAX

Insufficient Entropy Vulnerability in Telerik UI for ASP.NET AJAX

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13Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 5.3epss 0.2%
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.
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N
Affected products
Progress Software · Telerik UI for ASP.NET AJAX
Related CVEs — Progress Software Telerik UI for ASP.NET AJAX

In the same product, most dangerous first.

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