Progress Telerik UI for ASP.NET AJAX 2021.1.224/2025.1.416 File Content RadAsyncUpload entropy

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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4.1$0-$5k0.00

Summaryinfo

A vulnerability was found in Progress Telerik UI for ASP.NET AJAX. It has been declared as problematic. This issue affects the function RadAsyncUpload of the component File Content Handler. Such manipulation leads to entropy. This vulnerability is referenced as CVE-2026-2878. It is possible to launch the attack remotely. No exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Progress Telerik UI for ASP.NET AJAX. Affected by this issue is the function RadAsyncUpload of the component File Content Handler. The manipulation with an unknown input leads to a entropy vulnerability. Using CWE to declare the problem leads to 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. Impacted is integrity. CVE summarizes:

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.

The weakness was published by Monetary Authority. The advisory is shared for download at telerik.com. This vulnerability is handled as CVE-2026-2878 since 02/20/2026. The exploitation is known to be difficult. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1600.001.

Upgrading to version 2026.1.225 eliminates this vulnerability.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.2
VulDB Meta Temp Score: 4.1

VulDB Base Score: 3.1
VulDB Temp Score: 3.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 5.3
CNA Vector (ProgressSoftware): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Entropy
CWE: CWE-331 / CWE-330 / CWE-310
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Telerik UI for ASP.NET AJAX 2026.1.225

Timelineinfo

02/20/2026 CVE reserved
02/25/2026 +5 days Advisory disclosed
02/25/2026 +0 days VulDB entry created
02/25/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: telerik.com
Researcher: Monetary Authority
Status: Confirmed

CVE: CVE-2026-2878 (🔒)
GCVE (CVE): GCVE-0-2026-2878
GCVE (VulDB): GCVE-100-347780

Entryinfo

Created: 02/25/2026 16:18
Changes: 02/25/2026 16:18 (66)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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