Is This vulnerability exploited in the wild?

No. Junglewise Threat Intelligence has no report of This vulnerability being exploited in the wild.

How severe is This vulnerability?

Informational severity, with a CVSS score of 6.1, published 11 September 2020.

Which products and versions are affected?

swagger-ui (npm) SEMVER:introduced=0,fixed=2.2.1.

Is there a fix for This vulnerability?

Yes. swagger-ui (npm): upgrade to 2.2.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is This vulnerability attacked?

It is attacked over the network, in a software library.

Check whether you run swagger-ui (npm) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Swagger Swagger UI Cross-Site Scripting in API response rendering

Severity: info · CVSS 6.1 · Published 2020-09-11

Swagger UI, a tool used to visualize and interact with API documentation, is vulnerable to a security flaw that could allow attackers to run malicious scripts in a user's browser. This occurs when the tool displays a response from an API that is unexpectedly formatted as HTML instead of data. If an attacker can trick a user into interacting with a malicious API through the Swagger interface, they could potentially steal session information or perform actions on the user's behalf.

Technologies: swagger-ui (npm). Vendors: npm.

Quick answers

Is This vulnerability exploited in the wild?: No. Junglewise Threat Intelligence has no report of This vulnerability being exploited in the wild.
How severe is This vulnerability?: Informational severity, with a CVSS score of 6.1, published 11 September 2020.
Which products and versions are affected?: swagger-ui (npm) SEMVER:introduced=0,fixed=2.2.1.
Is there a fix for This vulnerability?: Yes. swagger-ui (npm): upgrade to 2.2.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is This vulnerability attacked?: It is attacked over the network, in a software library.
Am I affected?: Check whether you run swagger-ui (npm) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

swagger-ui (npm): upgrade to 2.2.1 or later
```
npm install swagger-ui@2.2.1
```

Technical details

Swagger UI versions prior to 2.2.1 are vulnerable to reflected Cross-Site Scripting (XSS). The vulnerability exists because the application fails to properly sanitize or encode output when an API endpoint returns a 'text/html' Content-Type, even if the UI expected 'application/json'. An attacker can exploit this by hosting or manipulating an API response to include malicious <script> tags, which are then executed in the context of the Swagger UI web page when a user clicks the 'Try it out!' button. This issue is resolved in version 2.2.1 by ensuring that HTML responses are properly encoded before being rendered.

Affected products

Swagger API swagger-ui < 2.2.1

Timeline

2015-04-13: disclosed: Issue reported on GitHub
2020-09-11: advisory: GitHub Advisory published

References

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