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CVE-2026-13184

HighPublished

RadAsyncUpload Default HMAC Key Fallback Vulnerability in Telerik UI for ASP.NET AJAX

Published: Jul 22, 2026
Updated: Jul 22, 2026
Assigning CNA: ProgressSoftware
Evidence observed: Sep 7, 2026

Primary CVSS

7.5/ 10High

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS probability estimate

0.2%

Low · next 30 days

Percentile: 11.3%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

In Progress® Telerik® UI for AJAX prior to v2026.2.708, when Telerik.Upload.ConfigurationHashKey is absent and machineKey is not explicitly configured, upload metadata integrity protection may fall back to a predictable default key, enabling attackers to forge protected upload metadata and unlock further exploit chains.

Sources

CVE-2026-13181-CVE-2026-13182-CVE-2026-13183-CVE-2026-13184PoC
Educational proof-of-concept for Telerik padding oracle vulnerabilities (CVE-2026-13181-184) with scripts for authorized security testing and research.

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