High · published July 22, 2026
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.
| Product | Versions | Fixed in |
|---|---|---|
| progress/telerik_ui_for_asp.net_ajax | ≥ 2010.1309, < 2026.2.708 | 2026.2.708 |