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Email Extension CVE-2023-25763

MEDIUM
Cross-site Scripting (XSS) (CWE-79)
2023-02-15 jenkinsci-cert@googlegroups.com
XSS Jenkins Email Extension
5.4
CVSS 3.1 · NVD
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Vulnerability Assessment

Weakness
CWE
CWE-79
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V1 - Encoding and Sanitization Output encoding, context-aware escaping
MITRE ATT&CK

2 techniques across 2 tactics: Initial Access, Execution

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

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Impact

CVSS score of 5.4 (MEDIUM). Attack characteristics: network attack vector, low complexity, low privileges required, user interaction required.
Exploit ScenarioDerived

A remote attacker could inject malicious scripts into web pages viewed by other users by sending crafted requests to the affected application.
This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
Patch available 0.6% exploitation probability (EPSS)

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AnalysisAI

Jenkins Email Extension Plugin 2.93 and earlier does not escape various fields included in bundled email templates, resulting in a stored cross-site scripting (XSS) vulnerability exploitable by. Rated medium severity (CVSS 5.4), this vulnerability is remotely exploitable, low attack complexity. No vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Sanitize all user input, use Content-Security-Policy headers, encode output contextually (HTML, JS, URL). Use frameworks with built-in XSS protection.

Affected Packages

maven org.jenkins-ci.plugins:email-ext fix: 2.94

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in maven

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

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Technical ContextAI · show details

This vulnerability is classified as Cross-Site Scripting (XSS) (CWE-79), which allows attackers to inject malicious scripts into web pages viewed by other users. Jenkins Email Extension Plugin 2.93 and earlier does not escape various fields included in bundled email templates, resulting in a stored cross-site scripting (XSS) vulnerability exploitable by attackers able to control affected fields. Affected products include: Jenkins Email Extension.

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  • Exploit and PoC references, threat intelligence from 22 sources
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Severity by source

NVD PRIMARY 5.4 MEDIUM
AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

DescriptionNVD

Jenkins Email Extension Plugin 2.93 and earlier does not escape various fields included in bundled email templates, resulting in a stored cross-site scripting (XSS) vulnerability exploitable by attackers able to control affected fields.

Threat Intelligence Overview

EPSS Score
0.6%
Top 55% exploitable
Data Quality
2 sources
Confidence: Low
NVD CVE.org EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC No
EPSS 0.6%
Patch available Yes
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation· derived
None
System Exposure· derived
Open
Automatable· derived
No
Human Impact· derived
Medium

Priority Score

28
Low Medium High Critical
KEV: 0
EPSS: +1
CVSS: +27
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Cross-Site Scripting MEDIUM

Cross-Site Scripting occurs when an application accepts untrusted data and sends it to a web browser without proper validation or encoding.

Affected Products (CPE)NVD

cpe:2.3:a:jenkins:email_extension:*:*:*:*:*:jenkins:*:*

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Arbitrary file disclosure in the Jenkins Email Extension Plugin (email-ext) versions 1933.v45cec755423f and earlier lets
CVE-2020-2232 HIGH
7.5 Aug 12

Jenkins Email Extension Plugin 2.72 and 2.73 transmits and displays the SMTP password in plain text as part of the globa
CVE-2018-1000176 MEDIUM
6.5 May 08

An exposure of sensitive information vulnerability exists in Jenkins Email Extension Plugin 2.61 and older in src/main/r
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Jenkins Email Extension Plugin 2.93 and earlier does not escape, sanitize, or sandbox rendered email template output or

CVE-2020-2253 MEDIUM
4.8 Sep 16

Jenkins Email Extension Plugin 2.75 and earlier does not perform hostname validation when connecting to the configured S
CVE-2023-32979 MEDIUM
4.3 May 16

Jenkins Email Extension Plugin does not perform a permission check in a method implementing form validation, allowing at
CVE-2023-32980 MEDIUM
4.3 May 16

A cross-site request forgery (CSRF) vulnerability in Jenkins Email Extension Plugin allows attackers to make another use

Same weakness CWE-79 – Cross-site Scripting (XSS)

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References

Advisories & patches
ADVISORY https://www.jenkins.io/security/advisory/2023-02-15/#SECURITY-2931 REF http://www.openwall.com/lists/oss-security/2023/02/15/4

Search Externally

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