Security context

What an agent needs to avoid regressing past fixes and find the next vuln in this repo.

Polymer/polymer

              master @ 26171d3
            

Fixes

CVEs

HIGH

Peak severity

100.0%

Coverage

Highlights

Cross-Site Scripting (XSS): 2 prior fixes. Scrutinize any change in this area.

lib/utils/settings.html: most-fixed (1 issue). Treat as high-risk during review.

2 high-severity fixes in this history; regressions here are high-impact.

Recurring patterns

The bug types that recur here, drawn from past fixes, not open vulnerabilities.

Cross-Site Scripting (XSS): Dynamic property and attribute binding reflections can lead to high-severity XSS if input values are not properly sanitized before being applied to DOM nodes. Failure to consistently hook into sanitization interfaces allows malicious payloads to execute within the victim's browser context.

Prototype Pollution: Unsafe deserialization of untrusted property attributes allows attackers to inject executable code or pollute prototypes if function-valued properties or object structures are processed without strict type validations.

Cross-Site Scripting (XSS): Template parsing without a registered global DOM value sanitizer leaves the application vulnerable to injection of arbitrary markup and executable scripts.