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CVE-2026-13185 is an unsafe deserialization vulnerability in Progress Telerik UI for AJAX versions 2013.1.220 through versions before 2026.2.708. Applications that configure RadPersistenceManager or RadDockLayout to use cookie-based storage deserialize attacker-controlled data supplied in a client cookie. A remote unauthenticated attacker can craft cookie content that causes unsafe object deserialization and can result in remote code execution.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This 62-file repository is an operational, lab-oriented Telerik/IIS exploitation suite rather than a framework module. Its main Python entry points are exploit/telerik_rce.py, telerik_exploit.py, and the Chain 2/3 variants; tools/ contains alternate upload, crypto-forging, padding-oracle, and full-chain drivers. The primary implemented path detects Telerik.Web.UI.WebResource.axd?type=rau, creates or loads forged rauPostData, uploads an ASPX webshell or marker DLL into a selected writable path (including C:\inetpub\wwwroot), attempts to finalize Telerik's .tmp upload, and accesses the resulting shell to run cmd.exe commands as the IIS app-pool identity. Supporting ASPX/C#/C++ files build a deliberately vulnerable Windows IIS lab, introspect Telerik internals through reflection, generate valid encrypted state, and provide benign marker payloads. The repository also claims alternate RadPersistenceManager cookie/path-traversal and RadDockLayout/ViewState-deserialization routes plus AES-CBC padding/timing-oracle key defeat. However, its own VERDICT states the demonstrated result was the known-key RadAsyncUpload upload-to-webroot webshell path; the oracle and alternate deserialization chains were not validated, and its documented AssemblyInstaller setter path alone does not load a standard managed assembly. No external C2 endpoint is embedded; networking is directed at an operator-supplied target URL or localhost lab endpoints.
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7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
One vulnerability in a separate Telerik UI for ASP.NET AJAX remote-code-execution chain affecting RadPersistenceManager and RadDockLayout.
An unauthenticated remote code execution vulnerability in Progress Telerik UI for ASP.NET AJAX caused by deserialization of attacker-controlled cookie content when cookie-based storage is used in RadPersistenceManager or RadDockLayout.
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Cross-references every affected SKU, including bundled OEM variants.
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