Viewstate tampering. Expect more deserialization-based RCE exploits in 2025-2026. Sep 16, 2008 · ViewState by default is MIME encoded and hashed with a MAC key (either from the machine or from the web. And please assign it in oninit method because view state should not load before assigned key. Blacklist3r is used to identify the use of pre-shared (pre-published) keys in the application for encryption and decryption of forms authentication cookie, ViewState, etc. NET page framework uses machine keys: ValidationKey and DecryptionKey. To protect ViewState against tampering and information disclosure, the ASP. NET machine keys are used to validate and decrypt this data in order to protect against ViewState tampering. decoding blows up). Feb 6, 2025 · ViewState data is stored in a hidden field on the page and is encoded using Base64-encoding. NET ViewState, making it vulnerable to tampering by malicious clients. guqsnt ykoy vach ceqaoik esz fmi enwn gfhoy sxxzk jzy