CVE-2020-10688

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.4% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2021-05-27 · updated 2026-06-17
Weakness: CWE-79

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.

Affected products

Red Hat Fuse: 1.0
Red Hat JBoss EAP: 7.3, 7.4
RedHat Openshift Application Runtimes: all versions
Red Hat, Inc. resteasy: before 3.11.1; from 4.5.0 before 4.5.3 — fixed in 3.11.1, 4.5.3

How to fix

Upgrade to a fixed version: Red Hat, Inc. resteasy 3.11.1, 4.5.3. Check the vendor advisory for mitigations.

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/
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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