CVE-2026-13183 Progress Software CVE debrief

Who should care

Users of Progress Telerik UI for AJAX versions prior to v2026.2.708, operators, platform administrators, vulnerability management teams, and security teams should assess and mitigate this vulnerability to prevent potential remote attacks and data exposure.

Technical summary

CVE-2026-13183 is a HIGH-severity vulnerability in Progress Telerik UI for AJAX RadAsyncUpload. Upload metadata processing may leak cryptographic validity through measurable timing differences, enabling remote attackers to recover protected metadata values. The vulnerability has a CVSS score of 7.5. Affected users should assess and mitigate this vulnerability to prevent potential remote attacks.

Defensive priority

High priority due to potential remote exploitation and data exposure.

Recommended defensive actions

• Inventory and assess Progress Telerik UI for AJAX versions prior to v2026.2.708
• Apply vendor-provided patches or updates
• Implement compensating controls to monitor and restrict access to RadAsyncUpload functionality
• Consider additional security measures to protect sensitive metadata
• Review compensating controls for exposed systems while remediation is scheduled and verified

Evidence notes

Evidence is limited; primary official records indicate a HIGH-severity vulnerability in Progress Telerik UI for AJAX RadAsyncUpload. Further verification and monitoring are recommended. The CVE record was published on 2026-07-22T14:17:13.807Z and has not been modified since then. Official records suggest measurable timing differences in upload metadata processing may leak cryptographic validity, enabling remote attackers to recover protected metadata values.

Official resources