CVE-2023-39151Network attack vector

Stored XSS via unencoded build-log hyperlinks

Published Jul 26, 2023 · Updated Oct 21, 2024

Stored XSS in Jenkins 2.415 and earlier and LTS 2.401.2 and earlier allows remote authenticated users to execute browser script. Build-log rendering converts attacker-controlled plain URLs into hyperlink annotations without sanitizing or properly encoding their URL values. Exploitation requires control of build log content and user interaction with rendered output, exposing the viewer's Jenkins session to same-origin script.

CVSS severity5.4
Medium
EPSS probability1.00%
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 2.415 and earlier and LTS 2.401.2 and earlier allows remote authenticated users to execute browser script. Build-log rendering converts attacker-controlled plain URLs into hyperlink annotations without sanitizing or properly encoding their URL values. Exploitation requires control of build log content and user interaction with rendered output, exposing the viewer's Jenkins session to same-origin script.

The record

CVE
CVE-2023-39151
Published
Jul 26, 2023
Updated
Oct 21, 2024
Vendor
Jenkins Project
Product
Jenkins
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 26, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 21, 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?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Jenkins Project · JenkinsAffected versions are unavailable in this record.

Published CVSS scores

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')
T1059.007JavaScript/JScript

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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