Medium severity · published Jul 22, 2026
CVE-2026-14865
XXE Denial of Service via RadLayoutBuilder Client State in Telerik UI for ASP.NET AJAX
5.3
CVSS
0.4%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 37% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
TU
Telerik UI for ASP.NET AJAX · Progress Software
2009.1.314 before 2026.2.708 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-14865
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-14865
Vendor Advisory
https://www.telerik.com/products/aspnet-ajax/documentation/knowledge-base/kb-security-rlb-xxe-injection-client-state-cve-2026-14865
More from Telerik UI for ASP.NET AJAX
9.8
CVE-2026-6023
Deserialization of Untrusted Data Vulnerability in Telerik UI for ASP.NET AJAX
8.1
CVE-2026-19219
DialogHandler UploadPaths Tampering Vulnerability in Telerik UI for ASP.NET AJAX
8.1
CVE-2026-13190
PersistenceFramework Unsafe Type Resolution Vulnerability in Telerik UI for ASP.NET AJAX
8.1
CVE-2026-13187
DialogHandler Provider Type Tampering Vulnerability in Telerik UI for ASP.NET AJAX
8.1
CVE-2026-13186
AppDataStorageProvider Path Traversal Deserialization Vulnerability in Telerik UI for ASP.NET AJAX