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Fencer Vulns
medium 6.1

CVE-2020-10688 json

Cross-site scripting in RESTEasy

published 2021-05-27 5 y ago modified 2026-06-17 4 mo ago also GHSA-29qj-rvv6-qrmv , EUVD-2021-1240

cvss
6.1
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.4%
EPSS 1.4% chance of exploitation in 30 days, percentile 72%
public exploits
0
none known

Summary

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.

Patch / fix

  • maven org.jboss.resteasy:resteasy-bom 3.11.1.Final, 4.5.3.Final
  • maven org.jboss.resteasy:resteasy-core 3.11.1.Final, 4.5.3.Final
  • redhat resteasy 3.11.1, 4.5.3
  • resteasy3.0 Debian 14, Debian 13, Debian 12 3.0.26-4

debian advisories DEBIAN-CVE-2020-10688

  • resteasy3.0 Ubuntu 22.04 LTS 3.0.26-3ubuntu0.1
  • resteasy Ubuntu Pro 16.04 LTS 3.0.6-3ubuntu0.1~esm1
  • resteasy Ubuntu Pro 20.04 LTS 3.6.2-2ubuntu0.20.04.1~esm1
  • resteasy Ubuntu Pro 22.04 LTS 3.6.2-2ubuntu0.22.04.1~esm1
  • resteasy Ubuntu Pro 24.04 LTS 3.6.2-2ubuntu0.24.04.1~esm1
  • resteasy3.0 Ubuntu Pro 18.04 LTS 3.0.26-1~18.04.1~esm1
  • resteasy3.0 Ubuntu Pro 20.04 LTS 3.0.26-1ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2020-10688

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • eap7-txw2 jboss enterprise application platform 7.3 2.3.3-4.b02_redhat_00001.1.el7eap
  • eap7-xsom jboss enterprise application platform 7.3 2.3.3-4.b02_redhat_00001.1.el7eap
  • eap7-rngom jboss enterprise application platform 7.3 2.3.3-4.b02_redhat_00001.1.el7eap
  • eap7-wss4j jboss enterprise application platform 7.3 2.2.5-1.redhat_00001.1.el7eap
  • eap7-jandex jboss enterprise application platform 7.3 2.1.2-1.Final_redhat_00001.1.el7eap
  • eap7-jasypt jboss enterprise application platform 7.3 1.9.3-1.redhat_00001.1.el7eap
  • eap7-wildfly jboss enterprise application platform 7.3 7.3.1-5.GA_redhat_00003.1.el7eap
  • eap7-jaxb-jxc jboss enterprise application platform 7.3 2.3.3-4.b02_redhat_00001.1.el7eap

red hat advisories RHSA-2020:2512RHSA-2020:2511RHSA-2020:2513

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-10688 updated cvss 5.4

RESTEasy: RESTEASY003870 exception in RESTEasy can lead to a reflected XSS attack

  • Red Hat JBoss Fuse 6 resteasy
    affected: no fix planned “Out of support scope”
  • Red Hat OpenShift Application Runtimes resteasy Red Hat support for Spring Boot resteasy
    affected: no fix available
  • Red Hat EAP-CD 19 Tech Preview
    fixed: vendor fix RHSA-2020:2333
  • Red Hat Fuse 7.9
    fixed: vendor fix RHSA-2021:3140
  • Red Hat JBoss EAP 7.3 for BaseOS-8 eap7-wss4j 2.2.5-1.redhat_00001.1.el8eap, eap7-jasypt 1.9.3-1.redhat_00001.1.el8eap, eap7-opensaml 3.3.1-1.redhat_00002.1.el8eap, eap7-txw2 2.3.3-4.b02_redhat_00001.1.el8eap, eap7-xsom 2.3.3-4.b02_redhat_00001.1.el8eap, eap7-rngom 2.3.3-4.b02_redhat_00001.1.el8eap, +194 more
    fixed: vendor fix RHSA-2020:2513
  • Red Hat JBoss EAP 7.3 for RHEL 6 Server eap7-wss4j 2.2.5-1.redhat_00001.1.el6eap, eap7-jasypt 1.9.3-1.redhat_00001.1.el6eap, eap7-opensaml 3.3.1-1.redhat_00002.1.el6eap, eap7-txw2 2.3.3-4.b02_redhat_00001.1.el6eap, eap7-xsom 2.3.3-4.b02_redhat_00001.1.el6eap, eap7-rngom 2.3.3-4.b02_redhat_00001.1.el6eap, +194 more
    fixed: vendor fix RHSA-2020:2511
  • Red Hat JBoss EAP 7.3 for RHEL 7 Server eap7-wss4j 2.2.5-1.redhat_00001.1.el7eap, eap7-jasypt 1.9.3-1.redhat_00001.1.el7eap, eap7-opensaml 3.3.1-1.redhat_00002.1.el7eap, eap7-txw2 2.3.3-4.b02_redhat_00001.1.el7eap, eap7-xsom 2.3.3-4.b02_redhat_00001.1.el7eap, eap7-rngom 2.3.3-4.b02_redhat_00001.1.el7eap, +196 more
    fixed: vendor fix RHSA-2020:2512
  • Red Hat JBoss Enterprise Application Platform 7
    fixed: vendor fix RHSA-2020:2515
show 2 more

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.39% chance of exploitation in the next 30 days, higher than 72% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/quarkusio/quarkus/issues/7248 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:P/A:N
GitHub 3.1 5.4 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

Affected packages

ecosystem package affected fixed in
maven org.jboss.resteasy:resteasy-bom
<3.11.1.Final
>=4.0.0, <4.5.3.Final
3.11.1.Final
4.5.3.Final
maven org.jboss.resteasy:resteasy-core
<3.11.1.Final
>=4.0.0, <4.5.3.Final
3.11.1.Final
4.5.3.Final

Affected products

  • n/a RESTEasy

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.