How severe is CVE-2020-10688?

CVE-2020-10688 has a CVSS score of 6.1/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which packages are affected by CVE-2020-10688?

CVE-2020-10688 affects the following packages: org.jboss.resteasy:resteasy-bom (Maven), org.jboss.resteasy:resteasy-bom (Maven), org.jboss.resteasy:resteasy-core (Maven), org.jboss.resteasy:resteasy-core (Maven). Ecosystems affected: Maven.

How do I fix CVE-2020-10688?

Update org.jboss.resteasy:resteasy-bom to 3.11.1.Final or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2020-10688 is resolved across your whole dependency graph.

How do I detect CVE-2020-10688 in my Maven dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.jboss.resteasy:resteasy-bom, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2020-10688 if there is no patch (or I can't update yet)?

Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Is CVE-2020-10688 actively exploited in the wild?

Yes. There are 1 known exploit references for CVE-2020-10688, including 1 in-the-wild exploitation observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2020-10688?

CVE-2020-10688 has an EPSS (Exploit Prediction Scoring System) score of 1.4%, placing it in the 72th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2020-10688?

CVE-2020-10688 is classified as Cross-site Scripting (XSS) (CWE-79). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation. This is a high-impact weakness class that often enables remote code execution or data exposure.

When was CVE-2020-10688 published, and has it been updated?

CVE-2020-10688 was published on May 27, 2021 and was last updated on November 3, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

☕

☕ Maven

Not in CISA KEV

MEDIUM severity

CVE-2020-10688 — resteasy-bom

MEDIUM

CVE-2020-10688 is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in org.jboss.resteasy:resteasy-bom. 1 public exploit or proof-of-concept reference is indexed, so weaponization risk is real. A fix is available for org.jboss.resteasy:resteasy-bom — see the affected versions and patch details below.

Cross-site scripting in RESTEasy

Also known asGHSA-29qj-rvv6-qrmv

Published

May 27, 2021

Updated

Nov 3, 2026

Affected

4 pkgs

Patched

4 / 4

Exploits

1 known

Exploitation data as of Nov 2, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

1.4%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs72th percentile — riskier than 72% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

4 pkgs affected

☕org.jboss.resteasy:resteasy-bom☕org.jboss.resteasy:resteasy-bom☕org.jboss.resteasy:resteasy-core☕org.jboss.resteasy:resteasy-core

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

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 Packages

4 total 4 fixed

Ecosystem	Package	Vulnerable range	Fix
☕Maven	`org.jboss.resteasy:resteasy-bom`	all versions	3.11.1.Final`org.jboss.resteasy:resteasy-bom:3.11.1.Final`
☕Maven	`org.jboss.resteasy:resteasy-bom`	≥ 4.0.0&&< 4.5.3.Final	4.5.3.Final`org.jboss.resteasy:resteasy-bom:4.5.3.Final`
☕Maven	`org.jboss.resteasy:resteasy-core`	all versions	3.11.1.Final`org.jboss.resteasy:resteasy-core:3.11.1.Final`
☕Maven	`org.jboss.resteasy:resteasy-core`	≥ 4.0.0&&< 4.5.3.Final	4.5.3.Final`org.jboss.resteasy:resteasy-core:4.5.3.Final`

Affected Products

4 products · 7 configurations

Application

fuseredhat

1 version

1.0

Application

jboss enterprise application platformredhat

2 versions

7.37.4

Application

openshift application runtimesredhat

all

Application

resteasyredhat

≥ 4.5.0 && < 4.5.3

range

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

A cross-site scripting (XSS) flaw was found in RESTEasy in versions befo…

github.comNVDJul 2021

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.jboss.resteasy:resteasy-bom, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update org.jboss.resteasy:resteasy-bom to 3.11.1.Final or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2020-10688 is resolved across your whole dependency graph.
Workarounds
Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Fixing This On Your OS

If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.

Red HatModerate

Product	Fixed in	Advisory
EAP-CD 19 Tech Preview	`resteasy`	RHSA-2020:2333
Red Hat Fuse 7.9	`resteasy`	RHSA-2021:3140
Red Hat JBoss EAP 7	`resteasy`	RHSA-2020:2515
Red Hat JBoss Enterprise Application Platform 7.3 for RHEL 6	`eap7-activemq-artemis-0:2.9.0-4.redhat_00010.1.el6eap`	RHSA-2020:2511
Red Hat JBoss Enterprise Application Platform 7.3 for RHEL 7	`eap7-activemq-artemis-0:2.9.0-4.redhat_00010.1.el7eap`	RHSA-2020:2512
Red Hat JBoss Enterprise Application Platform 7.3 for RHEL 8	`eap7-activemq-artemis-0:2.9.0-4.redhat_00010.1.el8eap`	RHSA-2020:2513
Red Hat Runtimes Spring Boot 2.2.6	`resteasy`	RHSA-2020:3806
Text-Only RHOAR	see advisory	RHSA-2020:2905

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is CVE-2020-10688 in your dependencies?

Find it across Maven, including transitive dependencies.

Scan my dependencies How O3 SCA works

CVSS Score

6.1/10CVSS v3 base

Vector breakdown

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Raw vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CWE Classification

CWE-79Cross-site Scripting (XSS)

Weaponization

No Nuclei template or Metasploit module yet. 1 public proof-of-concept reference is listed on this page.

OpenSSF Scorecard

Package health score

quarkus

5.8/10

Maintained10/10

Code-Review10/10

Branch-Protection5/10

Assessed Oct 19, 2026

Timeline

Disclosed

May 27, 2021

First exploit

Jul 6, 2021

Last updated

Nov 3, 2026

Identifiers

CVE-2020-10688

GHSA-29qj-rvv6-qrmv

References

Advisorysecurity.netapp.com · ntap 20210706 0008 Advisorynvd.nist.gov · CVE 2020 10688 Fixbugzilla.redhat.com · show bug.cgi Reportgithub.com Reportissues.redhat.com · RESTEASY 2519 Websecurity.netapp.com · ntap 20210706 0008

Related vulnerabilities

Also affects resteasy-bom

This CVE is medium severity; 4 of 4 other CVEs affecting resteasy-bom are rated as high or higher (top: high).

CVE-2016-9606CVE-2020-14326CVE-2021-20293CVE-2020-25724

Also affects resteasy-core

This CVE is medium severity, in line with the other 2 CVEs affecting resteasy-core.

CVE-2023-0482CVE-2021-20289

Same weakness: CWE-79

This CVE is medium severity; 2 of 2 other CVEs with CWE-79 are rated as high or higher (top: high).

CVE-2026-96632CVE-2026-9086Browse all CWE-79

Provenance

Sources

OSV.devNVDFIRST.org (EPSS)

Last verifiedNov 3, 2026

CVE-2020-10688 — resteasy-bom

EPSS Exploitation Probability

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

Description

Affected Packages

Affected Products

Detection & mitigation playbook

Detect

Fix

Workarounds

Fixing This On Your OS

Frequently Asked Questions

Is CVE-2020-10688 in your dependencies?