Medium 5.3Published Feb 25, 2026

CVE-2026-2878Insufficient Entropy Vulnerability in Telerik UI for ASP.NET AJAX

Updated under an hour ago (Oct 26, 2026, 6:23 PM ET)

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It affects Progress Software Telerik UI for ASP.NET AJAX and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for Progress Software Telerik UI for ASP.NET AJAX

Exploited in the last 30 days

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: 5.3 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N
Weakness (CWE): CWE-331
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: ProgressSoftware
NVD analysis: Analyzed
Record last updated: Feb 27, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Progress Software Telerik UI for ASP.NET AJAX progress_software:telerik_ui_for_asp.net_ajax (from the name)	from 2011.2.712 before 2026.1.225	CNA record
progress telerik_ui_for_asp.net_ajax progress:telerik_ui_for_asp.net_ajax	before 2026.1.225	NVD

References

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.