CVE-2026-2878
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Predictable ID Vulnerability in Telerik RadAsyncUpload Enables Tampering

Publication date: 2026-02-25

Last updated on: 2026-02-26

Assigner: Progress Software Corporation

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.
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Meta Information
Published
2026-02-25
Last Modified
2026-02-26
Generated
2026-06-16
AI Q&A
2026-02-25
EPSS Evaluated
2026-06-14
NVD
CVE-2026-2878
EUVD
EUVD-2026-8655
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
progress telerik_ui_for_asp.net_ajax to 2026.1.225 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-331 The product uses an algorithm or scheme that produces insufficient entropy, leaving patterns or clusters of values that are more likely to occur than others.
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Executive Summary

This vulnerability exists in Progress® Telerik® UI for AJAX versions prior to 2026.1.225, specifically in the RadAsyncUpload component. It is caused by insufficient entropy in generating temporary identifiers, which are predictable because they are based on the timestamp and filename. This predictability can lead to collisions and allow an attacker to tamper with file contents.

Impact Analysis

The vulnerability can impact you by enabling attackers to cause collisions in temporary file identifiers and tamper with the contents of uploaded files. This can compromise the integrity of files being uploaded through the RadAsyncUpload component, potentially leading to unauthorized modification of data.

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