CVE-2020-2162Network attack vector

Stored XSS via missing file-response CSP

Published Mar 25, 2020 · Updated Aug 4, 2024

Stored XSS in Jenkins 2.227 and earlier and LTS 2.204.5 and earlier allows remote authenticated users to execute script via file parameters. Uploaded file parameters are served without the Content-Security-Policy header that constrains active content in stored files. Build permission on a job with file parameters is required, and a victim must view the uploaded file for script execution in that user's browser context.

CVSS severity5.4
Medium
EPSS probability1.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Jenkins 2.227 and earlier and LTS 2.204.5 and earlier allows remote authenticated users to execute script via file parameters. Uploaded file parameters are served without the Content-Security-Policy header that constrains active content in stored files. Build permission on a job with file parameters is required, and a victim must view the uploaded file for script execution in that user's browser context.

The record

CVE
CVE-2020-2162
Published
Mar 25, 2020
Updated
Aug 4, 2024
Vendor
Jenkins Project
Product
Jenkins
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 25, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <=2.227
  2. Affected versionversion=unspecified <=LTS 2.204.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Jenkins Project · Jenkinsversion=unspecified <=2.227; version=unspecified <=LTS 2.204.5

Published CVSS scores

3.5NIST NVDAV:N/AC:M/Au:S/C:N/I:P/A:N
5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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