How severe is CVE-2020-2206?

CVE-2020-2206 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-2020-2206?

CVE-2020-2206 affects the following packages: org.jenkins-ci.plugins:vncrecorder (Maven). Ecosystems affected: Maven.

How do I fix CVE-2020-2206?

Update org.jenkins-ci.plugins:vncrecorder to 1.35 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2020-2206 is resolved across your whole dependency graph.

How do I detect CVE-2020-2206 in my Maven dependencies?

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

How do I mitigate CVE-2020-2206 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-2020-2206 actively exploited in the wild?

No public exploit code has been indexed for CVE-2020-2206 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2020-2206?

CVE-2020-2206 has an EPSS (Exploit Prediction Scoring System) score of 0.9%, placing it in the 59th 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-2020-2206?

CVE-2020-2206 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-2020-2206 published, and has it been updated?

CVE-2020-2206 was published on July 2, 2020 and was last updated on October 24, 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-2020-2206 — vncrecorder

MEDIUM

CVE-2020-2206 is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in org.jenkins-ci.plugins:vncrecorder. A fix is available for org.jenkins-ci.plugins:vncrecorder — see the affected versions and patch details below.

Reflected XSS vulnerability in Jenkins VncRecorder Plugin

Also known asGHSA-fq52-6cjf-jw59

Published

Jul 2, 2020

Updated

Oct 24, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Nov 4, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

0.9%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs59th percentile — riskier than 59% 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

1 pkg affected

☕org.jenkins-ci.plugins:vncrecorder

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

VncRecorder Plugin 1.25 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.

VncRecorder Plugin 1.35 escapes the parameter value in the output.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
☕Maven	`org.jenkins-ci.plugins:vncrecorder`	all versions	1.35`org.jenkins-ci.plugins:vncrecorder:1.35`

Affected Products

1 product · 1 configurations

Application

vncrecorderjenkins

≤ 1.25

range

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.jenkins-ci.plugins:vncrecorder, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update org.jenkins-ci.plugins:vncrecorder to 1.35 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2020-2206 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.

Frequently Asked Questions

VncRecorder Plugin 1.25 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. VncRecorder Plugin 1.35 escapes the parameter value in the output.

O3 Security · Impact-Aware SCA

Is CVE-2020-2206 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, Metasploit module or public proof-of-concept found.

Timeline

Disclosed

Jul 2, 2020

Last updated

Oct 24, 2026

Identifiers

CVE-2020-2206

GHSA-fq52-6cjf-jw59

References

Advisoryopenwall.com Advisoryjenkins.io · 2020 07 02 Advisorynvd.nist.gov · CVE 2020 2206 Webjenkins.io · 2020 07 02 Packagegithub.com · vncrecorder plugin

Related vulnerabilities

Also affects vncrecorder

This CVE is medium severity, in line with the other 1 CVE affecting vncrecorder.

CVE-2020-2205

Same weakness: CWE-79

This CVE is medium severity; 7 of 7 other CVEs with CWE-79 are rated as high or higher (top: critical).

CVE-2026-113787CVE-2026-44267CVE-2026-96632CVE-2026-9086CVE-2026-118246CVE-2026-118251CVE-2026-118253Browse all CWE-79

Provenance

Sources

OSV.devNVDFIRST.org (EPSS)

Last verifiedOct 24, 2026