CVE-2023-4303Network attack vector

HTML injection via unescaped validation errors

Published Aug 21, 2023 · Updated Oct 1, 2024

HTML injection in Jenkins Fortify Plugin 22.1.38 and earlier allows remote attackers to inject HTML into form-validation responses. A form-validation method returns an error message without escaping HTML, allowing attacker-controlled tags to enter the response. A user must view the crafted response; Jenkins 2.275 and LTS 2.263.2 hardening blocks injected JavaScript, limiting the impact to HTML content.

CVSS severity4.3
Medium
EPSS probability0.47%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

HTML injection in Jenkins Fortify Plugin 22.1.38 and earlier allows remote attackers to inject HTML into form-validation responses. A form-validation method returns an error message without escaping HTML, allowing attacker-controlled tags to enter the response. A user must view the crafted response; Jenkins 2.275 and LTS 2.263.2 hardening blocks injected JavaScript, limiting the impact to HTML content.

The record

CVE
CVE-2023-4303
Published
Aug 21, 2023
Updated
Oct 1, 2024
Vendor
Jenkins Project
Product
Fortify Jenkins Plugin
Classifications
CWE-79
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 21, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 1, 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=0 <=22.1.38

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Jenkins Project · Fortify Jenkins Pluginversion=0 <=22.1.38

Published CVSS scores

4.3OpenTextCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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

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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