| Package | Affected versions | Patched versions |
|---|---|---|
| stdlib | ≥ 1.15.0-0, < 1.15.1< 1.14.8 | 1.15.11.14.8 |
| go | ≥ 1.15.0, < 1.15.1< 1.14.8 | 1.15.11.14.8 |
| communications cloud native core policy | = 1.5.0 |
When a Handler does not explicitly set the Content-Type header, the the package would default to “text/html”, which could cause a Cross-Site Scripting vulnerability if an attacker can control any part of the contents of a response.
The Content-Type header is now set based on the contents of the first Write using http.DetectContentType, which is consistent with the behavior of the net/http package.
Although this protects some applications that validate the contents of uploaded files, not setting the Content-Type header explicitly on any attacker-controlled file is unsafe and should be avoided.
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