CVE-2026-13183
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In Progress Telerik UI for AJAX Timing Side Channel in Metadata Processing

Publication date: 2026-07-22

Last updated on: 2026-07-22

Assigner: Progress Software Corporation

Description
In Progress® Telerik® UI for AJAX prior to v2026.2.708, RadAsyncUpload upload metadata processing may leak cryptographic validity through measurable timing differences, enabling remote attackers to recover protected metadata values.

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Meta Information

Published
2026-07-22
Last Modified
2026-07-22
Generated
2026-07-22
AI Q&A
2026-07-22
EPSS Evaluated
N/A
NVD
CVE-2026-13183
EUVD
EUVD-2026-47688

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
progress telerik_ui_for_ajax to 2026.2.708 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-208 Two separate operations in a product require different amounts of time to complete, in a way that is observable to an actor and reveals security-relevant information about the state of the product, such as whether a particular operation was successful or not.

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Executive Summary

This vulnerability affects Progress Telerik UI for AJAX versions before v2026.2.708. It involves RadAsyncUpload, where upload metadata processing may leak cryptographic validity through timing differences. Attackers can exploit this to recover protected metadata values remotely.

Detection Guidance

Detection involves monitoring for unusual timing patterns during file upload metadata processing. Check for abnormal delays in responses from RadAsyncUpload endpoints. Review server logs for repeated failed upload attempts or unusual metadata requests.

Impact Analysis

An attacker could exploit this to recover sensitive metadata values, potentially leading to unauthorized access or data exposure. The impact includes compromised confidentiality of protected information.

Compliance Impact

This vulnerability could lead to unauthorized data access, violating GDPR's data protection principles and HIPAA's security requirements. Non-compliance risks include legal penalties and reputational damage.

Mitigation Strategies

Upgrade to Telerik UI for AJAX v2026.2.708 or later. Disable RadAsyncUpload if not in use. Implement network-level monitoring for suspicious upload patterns. Apply input validation and rate limiting to upload endpoints.

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