In Progress® Telerik® UI for AJAX prior to v2026.2.708, a deserialization vulnerability in the persistence utilities allows unsafe type instantiation from attacker-influenced persisted state, which can lead to remote code execution.
The CVSS severity warrants an early asset and exposure review.
In Progress® Telerik® UI for AJAX prior to v2026.2.708, a deserialization vulnerability in the persistence utilities allows unsafe type instantiation from attacker-influenced persisted state, which can lead to remote code execution.
Confirm exposure before applying a vendor-supported change.
Confirm that Progress Software Telerik UI for ASP.NET AJAX and an affected version are present.
Combine exploitation signals with asset exposure and business criticality.
Follow the vendor advisory or supported update path and preserve rollback options.
Recheck the version, service health, access paths, and relevant logs.
