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| Package Name | Ecosystem | Vulnerable Versions | First Patched Version |
|---|---|---|---|
| mailgen | npm | <= 2.0.30 | 2.0.31 |
Miggo AIRoot Cause AnalysisThe analysis of the vulnerability and the provided patch (commit 7279a983481d05c51aa451e86146f98aaa42fee9) points directly to a logical flaw in the Mailgen.prototype.generatePlaintext function located in index.js. The core of the vulnerability is the incorrect order of sanitization operations. The function first stripped what it thought were all HTML tags and then decoded HTML entities. This allowed malicious, entity-encoded HTML to pass through the stripping filter, only to be decoded afterward, effectively re-injecting the HTML into the output. The patch corrects this by reversing the order: it first decodes all HTML entities, ensuring any hidden HTML is revealed, and then it strips all HTML tags. Therefore, Mailgen.generatePlaintext is the single, clearly identifiable vulnerable function that would be active during the exploitation of this vulnerability.
