TI-2026-02472 Aliases CVE-2026-2878 GHSA-wqx8-r5jg-36w6

Insufficient Entropy Vulnerability in Telerik UI for ASP.NET AJAX

LOW 26CWE-331Published 2026-02-25 · Updated 2026-02-27

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: High
Impact type: —
Confidentiality · integrity · availability: None · High · None
Fix status: Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00211 11th percentileScored 2026-11-07

Fix Fixed Telerik UI for ASP.NET AJAX (Progress Software): 2026.1.225

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Progress	Telerik UI for ASP.NET AJAX	2011.2.712 to before 2026.1.225	2026.1.225	Patch available	CNA

Telerik UI for ASP.NET AJAX VendorProgress Affected 2011.2.712 to before 2026.1.225 Fixed in 2026.1.225 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:progress:telerik_ui_for_asp.net_ajax::::::::	before 2026.1.225	Vulnerable	Progress

cpe:2.3:a:progress:telerik_ui_for_asp.net_ajax:*:*:*:*:*:*:*:* Versions before 2026.1.225 Vulnerable ·Progress

Remediation

Fix · CNA Telerik UI for ASP.NET AJAX (Progress Software) Fixed in 2026.1.225

Timeline

2026-10-02 Threatist record created from CVE-2026-2878
2026-10-03 Alias added: GHSA-wqx8-r5jg-36w6

References

Advisory 1

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

TI-2017-08395 Progress Telerik UI for ASP.NET AJAX before R2 2017 SP2 does not properly restrict user… KEVCVSS 3.1CRITICAL 9.8
TI-2025-03167 Unsafe Reflection Vulnerability in Telerik UI for ASP.NET AJAX CVSS 3.1HIGH 7.5
TI-2019-14262 Path traversal in RadChart in Telerik UI for ASP.NET AJAX allows a remote attacker to… CVSS 3.1CRITICAL 9.8
TI-2021-09372 An issue was discovered in Progress Telerik UI for ASP.NET AJAX 2021.1.224. CVSS 3.1CRITICAL 9.8
TI-2026-05284 Deserialization of Untrusted Data Vulnerability in Telerik UI for ASP.NET AJAX CVSS 3.1CRITICAL 9.8
TI-2014-01755 Absolute path traversal vulnerability in the RadAsyncUpload control in the RadControls in… CVSS 2.0HIGH 7.5

See all 20 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences