REPOST: TrustedTypes violations - from portswigger
REPOST A Deep Dive into JS Trusted Types Violations In our previous blogpost, we provided a comprehensive overview of the Trusted Types (TT) rollout in AppSheet, highlighting the importance of this web security standard for mitigating Cross-Site Scripting (XSS) vulnerabilities. Now, we're ready to dive into the technical details of how we identified the root causes for TT violations. In particular, this blog post will detail the challenges we encountered with 2 flagship rollouts: Gmail and AppSheet. Since the rollout of Trusted Types in those products a year ago, we didn’t have a single DOM XSS reported in them. Both services presented us with unique obstacles during the Trusted Types rollout, yet they also shared common characteristics whose complexity we had to deal with (large codebase, diverse OSS and OSS legacy stack, …). The code was not written following Google standard practises so we could not use Google standard toolings. Therefore, we believe that our approach to these ...
