Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learningThere is no fixed version for accesslog
.
accesslog is a simple common/combined access log middleware
Affected versions of this package are vulnerable to Arbitrary Code Injection due to the usage of the Function
constructor without input sanitization.
If (attacker-controlled) user input is given to the format option of the package's exported constructor function
, it is possible for an attacker to execute arbitrary JavaScript code on the host that this package is being run on.
var accesslog = require('accesslog');
var handler = accesslog({
format: `\\\" + console.log('XSS');//`,
});
var req = {};
var res = {
end: function() {},
};
handler(req, res, function() {});
res.end();