Reflected XSS vulnerability in Jenkins VncViewer Plugin

MEDIUM 6.1CVE-2020-2207 · GHSA-2j4h-cjgh-659v · Published 02/07/2020 · updated 17/06/2026

In short

CVE-2020-2207 is a MEDIUM (CVSS 6.1) vulnerability affecting org.jenkins-ci.plugins:vncviewer, vncviewer (jenkins).
Chance of exploitation in the next 30 days (EPSS): 0.87%, higher than 59.0% of all vulnerabilities.
Fix: update to 1.8 or later.

Package	Affected versions	Patched versions
org.jenkins-ci.plugins:vncviewer Maven	`< 1.8`	`1.8`
vncviewer jenkins	`≤ 1.7`	No fix yet

Description

VncViewer Plugin 1.7 and earlier does not escape a parameter value in the checkVncServ form validation endpoint output.

This results in a reflected cross-site scripting (XSS) vulnerability.

VncViewer Plugin 1.8 escapes the parameter value in the output.

NVD description

Jenkins VncViewer Plugin 1.7 and earlier does not escape a parameter value in the checkVncServ form validation endpoint, resulting in a reflected cross-site scripting (XSS) vulnerability.

References

nvd.nist.gov/vuln/detail/CVE-2020-2207 · ADVISORY
jenkinsci/vncviewer-plugin commit 99b2aa3 · WEB
jenkinsci/vncviewer-plugin · PACKAGE
jenkins.io/security/advisory/2020-07-02 · WEB
openwall.com/lists/oss-security/2020/07/02/7 · WEB

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