Telerik Flaw Chain Lets Unauthenticated Attackers Turn Padding Oracle Into Remote Code Execution

Cybersecuritynews •Abinaya • September 7, 2026

Security researchers have uncovered a significant vulnerability chain in Telerik UI for ASP.NET AJAX, allowing unauthenticated attackers to execute remote code in vulnerable enterprise web applications. The issue primarily affects Telerik’s RadAsyncUpload component, a widely used file-upload control in ASP.NET WebForms applications. Progress Software has indicated that the flaw impacts versions from 2010.1.309 to 2026.2.519. […]

The full story

This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

Telerik UI Vulnerability Chain Enables Unauthenticated RCE Attacks A significant vulnerability chain in Telerik UI for ASP.NET AJAX has been disclosed, allowing unauthenticated attackers to achieve remote code execution (RCE) through a padding oracle exploit. The vulnerabilities affect versions 2010.1.309 to 2026.2.519, with a patch available in version 2026.2.708. The attack exploits a combination of an unauthenticated AES-CBC padding oracle and insecure deserialization in the RadAsyncUpload component. Researchers from Tanto Security demonstrated the exploit, releasing a proof-of-concept tool that includes payloads for executing commands on vulnerable servers. Progress Software has confirmed the vulnerabilities and released advisories, but there are no known instances of exploitation in the wild as of now. Users are urged to upgrade to the patched version to mitigate the risks. The vulnerabilities are tracked under CVEs including CVE-2026-13181 and CVE-2026-13182. 3 sources 58

Extracted Entities

Telerik Flaw Chain Lets Unauthenticated Attackers Turn Padding Oracle Into Remote Code Execution

The full story

Extracted Entities

Attack Types (1)

Companies (1)

Platforms (1)