CVE-2026-13184 Progress Software CVE debrief

Who should care

Organizations using Progress Telerik UI for AJAX prior to v2026.2.708 should assess and mitigate this vulnerability to prevent potential upload metadata integrity issues. Operators, platform administrators, vulnerability management teams, and security teams should review the affected scope and vendor guidance.

Technical 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. This issue has a CVSS score of 7.5 and is classified as HIGH severity. Affected organizations should verify their deployments, review official advisories, and apply mitigations to prevent potential metadata tampering.

Defensive priority

High priority due to potential for metadata tampering

Recommended defensive actions

• Inventory and verify Progress Telerik UI for AJAX versions
• Apply v2026.2.708 or later if vulnerable
• Explicitly configure machineKey
• Monitor for suspicious upload activity
• Implement compensating controls for metadata integrity
• Review official advisory or CVE record to validate affected scope and vendor guidance
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

Evidence is limited; verification of vendor claims and configuration impacts is necessary. The CVE record was published on 2026-07-22T14:17:13.927Z and has not been modified since then. Limited source detail is available, and defenders should verify the affected scope and vendor guidance.

Official resources