Risky Bulletin Newsletter
September 05, 2025
Risky Bulletin: Chrome 140 comes with new hardened cookies
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News Editor
Google has released version 140 of its Chrome browser this week, with support for a new security feature designed to protect server-set cookies from client-side tampering.
The new feature is a cookie prefix, a piece of text added before the names of a browser's cookie files.
Cookie prefixes are different from cookie headers and, in the words of security firm ERNW, are a lesser-known browser security feature that is rarely used by web developers.