CVE-2023-43495Network attack vector

Stored XSS via unescaped caption

Published Sep 20, 2023 · Updated Sep 24, 2024

Cross-site scripting in Jenkins 2.423 and earlier and LTS 2.414.1 and earlier allows attackers to execute script via crafted caption values. The ExpandableDetailsNote constructor inserts its caption parameter without escaping before rendering build-log annotations, allowing attacker-controlled markup to persist. The gate is the ability to supply a caption value; Jenkins states that this API is not used in core, so impact is limited to deployments or plugins that invoke it.

CVSS severity5.4
Medium
EPSS probability0.88%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Jenkins 2.423 and earlier and LTS 2.414.1 and earlier allows attackers to execute script via crafted caption values. The ExpandableDetailsNote constructor inserts its caption parameter without escaping before rendering build-log annotations, allowing attacker-controlled markup to persist. The gate is the ability to supply a caption value; Jenkins states that this API is not used in core, so impact is limited to deployments or plugins that invoke it.

The record

CVE
CVE-2023-43495
Published
Sep 20, 2023
Updated
Sep 24, 2024
Vendor
Jenkins Project
Product
Jenkins
Classifications
CWE-79, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 20, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 24, 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

5.4NVDCVSS: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')
T1190Exploit Public-Facing Application

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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