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No Semgrep rule in this article is shown to catch a specific Brakeman miss, because a miss can only be tested against the code and scan that produced it. What you can do is confirm whether Brakeman’s XSS checks were actually running, identify the exact path from user input to unescaped output, and write a Semgrep taint rule for that path with unsafe and safe test cases. The steps below show how, and where the evidence stops.
What Brakeman and Semgrep each do
Brakeman is a static-analysis scanner for Ruby on Rails applications. It analyzes source code rather than requiring a running application (Brakeman introduction). Semgrep is a general static-analysis tool that lets you write custom rules in YAML, including taint rules that track data from a source to a sensitive function.
The two tools overlap on XSS but are not interchangeable. Brakeman ships built-in checks, while a Semgrep rule is only as complete as the patterns you write for your own code.
Check the scan before blaming the scanner
A missed XSS is often a configuration question before it is a tool limitation. Work through these checks in order:
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- Scan flags. The Brakeman README warns that
--fasterdisables features and may cause missed vulnerabilities. If your CI job or script uses it, rerun without it and compare the output. - Configuration. Brakeman’s false-positive guide recommends starting with the default checks and narrowing only after you understand the results. A scan that was narrowed earlier may not include the XSS check you expect.
- Ignored warnings. Confirm whether the finding was previously suppressed or ignored in your project’s Brakeman configuration, since an ignored warning looks like a miss in the output.
- Versions. Record the Brakeman version, the Rails version, and the Ruby version. Behavior can differ between releases, and this article does not establish which version changed any given check.
- The rendered output. Compare the view or controller code with the HTML the browser actually receives. The code path you suspect may differ from the path that renders the value.
If the rerun with default checks still produces no warning, you have a reproducible gap worth reporting, and the rule-writing steps below apply directly.
What Brakeman’s XSS checks cover
Brakeman’s XSS documentation describes XSS as a user-manipulatable value displayed without escaping. It names two common cases: a request parameter or cookie that is output directly, and a method that receives user input and returns a value that is rendered unescaped. Those are the paths to compare against your code.
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A gap usually sits in one of three places: the value passes through a helper that Brakeman does not follow, the output is marked as safe somewhere in the chain, or the user-controlled data is stored and later read back rather than coming straight from a request.
Write a Semgrep taint rule for the exact path
Semgrep’s rule-writing documentation describes rules in YAML and taint analysis for following data from user input to a sensitive function. Build the rule from the real code, not from a generic XSS pattern.
- Identify the source. Write down the exact user-controlled expression, such as a
paramslookup, a cookie read, or a value loaded from user-submitted content. - List the transformations. Record every helper call and assignment between the source and the output, including any escaping, sanitizing, or marking of output as safe. These determine whether the path is actually unsafe.
- Identify the sink. Name the exact browser context where the value is emitted: an HTML body, an attribute, or a JavaScript context. In Rails views, calls that mark output as safe, such as
raworhtml_safe, are common sinks to check, but confirm them against your own templates. - Write the taint rule. Start from the scaffold below and replace each placeholder with a valid Semgrep pattern taken from your code. Placeholders are written in capitals so they cannot be mistaken for working patterns.
- Write fixtures. Create one unsafe example that should match and at least one safe example that should not, using the same helpers your application uses.
- Run against the project. Run the rule on the real repository with the Semgrep version you deploy, and confirm the match set matches your fixtures.
rules:
- id: rails-project-xss-at-actual-sink
mode: taint
languages: [ruby]
severity: WARNING
message: User-controlled data reaches the project-specific unescaped output sink.
pattern-sources:
- pattern: SOURCE_PATTERN_FROM_YOUR_CODE
pattern-sinks:
- pattern: SINK_PATTERN_FROM_YOUR_TEMPLATE
This scaffold is not a working detection rule. Its placeholders must be replaced, and it has not been run against any Rails application. If your transformations include escaping or sanitizing calls, add them as sanitizers so the rule does not flag safe paths.
What a Semgrep match does and does not prove
A static match is a signal to investigate, not proof of exploitability. Whether an XSS is real depends on the output context and on any escaping or sanitization applied along the way. Confirm each match by checking the rendered HTML for the unsafe fixture and for a real request, and by checking that the safe fixture produces no match.
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Semgrep’s January 21, 2021 article describes XSS checks it wrote for Ruby on Rails and frames them as patterns to help mitigate XSS. That article documents the work as of its date; it does not establish that a current community rule catches a particular Brakeman miss.
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| Aspect | Brakeman | Semgrep |
|---|---|---|
| Primary scope | Static analysis of Ruby on Rails source code | General static analysis with custom YAML rules |
| XSS coverage | Documented checks for unescaped user-manipulatable output, including direct parameters, cookies, and method results | Coverage depends on the rules you write; a Rails XSS cheat sheet was published January 21, 2021, and its current accuracy is not stated |
| Data-flow modeling | Not stated for the specific path in question | Taint analysis from a source pattern to a sink pattern |
| Scan configuration | The --faster flag disables features and may miss vulnerabilities; defaults are recommended first |
Scope and severity are set per rule file |
| Validation approach | Not stated in the documentation reviewed | Fixture-based testing with unsafe and safe examples, as described above |
Neither tool is shown to be more complete than the other for every Rails XSS. The right choice depends on whether the miss is in Brakeman’s built-in checks or in a path you can express as a source-to-sink rule.
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Once you have a minimal reproducer, the Brakeman report, scan command, versions, and the rendered output are enough to decide between a configuration fix, a Brakeman issue report, and a custom Semgrep rule.
Rule syntax and Brakeman behavior change between releases, so confirm them against the current official documentation for the versions you run.
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