XXE in Progress Telerik Ui For Asp.net Ajax
CVE-2026-14865
In Progress® Telerik® UI for AJAX prior to v2026.2.708, the internal LayoutBuilder control processes client-state XML without disabling DTD processing, allowing unauthenticated denial of service via recursive XML entity expansion.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.004 (36.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 37th percentile — 36.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Progress Telerik Ui For Asp.net Ajax
- Progress Software Telerik Ui For Asp.net Ajax — versions 2009.1.314
Weakness classification (CWE)
References
- www.telerik.com/products/aspnet-ajax/documentation/knowledge-base/kb-security-r… (vendor-advisory, Mitigation, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-14865?
- CVE-2026-14865 is a medium-severity vulnerability in Progress Telerik Ui For Asp.net Ajax, classified under Improper Restriction of Recursive Entity References in DTDs (XML Entity Expansion). CVSS score: 5.3/10. Published 2026-07-22.
- How severe is CVE-2026-14865?
- Medium severity. CVSS v3 base score is 5.3 out of 10.