CVE-2026-48920
published 2026-05-27CVE-2026-48920: Jenkins Email Extension Plugin 1933.v45cec755423f and earlier allows inlining images as `base64` in email content by setting the `data-inline` attribute…
PriorityP356high8.8CVSS 3.1
AVNACLPRLUINSUCHIHAH
EPSS
0.51%
42.6th percentile
Jenkins Email Extension Plugin 1933.v45cec755423f and earlier allows inlining images as `base64` in email content by setting the `data-inline` attribute, without restrictions on the image URLs that can be inlined, allowing attackers able to control the email content to specify `file:` URLs for images to read arbitrary files from the Jenkins controller filesystem.
Affected
27 ranges· showing 25
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| jenkins | active_directory | — | — |
| jenkins | active_directory_plugin | — | — |
| jenkins | appspider | — | — |
| jenkins | appspider_plugin | — | — |
| jenkins | bitbucket_oauth | — | — |
| jenkins | bitbucket_oauth_plugin | — | — |
| jenkins | credentials_binding | — | — |
| jenkins | credentials_binding_plugin | — | — |
| jenkins | email_extension | <= 1925.v1598902b_58dd | — |
| jenkins | email_extension | — | — |
| jenkins | email_extension | — | — |
| jenkins | email_extension_plugin | — | — |
| jenkins | github_integration | — | — |
| jenkins | github_integration_plugin | — | — |
| jenkins | groovy_libraries | — | — |
| jenkins | groovy_libraries_plugin | — | — |
| jenkins | job_import | — | — |
| jenkins | job_import_plugin | — | — |
| jenkins | ldap | — | — |
| jenkins | ldap_plugin | — | — |
| jenkins | ldap_referrals_in_active_directory | — | — |
| jenkins | ldap_referrals_in_active_directory_plugin | — | — |
| jenkins | multijob | — | — |
| jenkins | multijob_plugin | — | — |
| jenkins_project | jenkins_email_extension_plugin | <= 1933.v45cec755423f | — |
CVSS provenance
nvdv3.18.8HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
vendor_redhat8.8HIGH
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GHSA
Jenkins Email Extension Plugin: Attackers able to control email content may specify `file:` URLs for images to read arbitrary files from Jenkins controller filesystem
ghsa·2026-05-27
CVE-2026-48920 [HIGH] CWE-73 Jenkins Email Extension Plugin: Attackers able to control email content may specify `file:` URLs for images to read arbitrary files from Jenkins controller filesystem
Jenkins Email Extension Plugin: Attackers able to control email content may specify `file:` URLs for images to read arbitrary files from Jenkins controller filesystem
Jenkins Email Extension Plugin 1933.v45cec755423f and earlier includes a feature that allows inlining images as `base64` in email content by setting the `data-inline` attribute. No restrictions are placed on the image URLs that can be inlined.
This allows attackers able to control the email content to specify `file:` URLs for images to read arbitrary files from the Jenkins controller filesystem.
The feature allowing inlining images as `base64` in email content by setting the `data-inline` attribute is removed from Email Extension Plugin 1933.1935.v276319e3cc47.
GHSA
GHSA-mq58-m26g-46gp: Jenkins Email Extension Plugin 1933
ghsa_unreviewed·2026-05-27
CVE-2026-48920 [HIGH] CWE-73 GHSA-mq58-m26g-46gp: Jenkins Email Extension Plugin 1933
Jenkins Email Extension Plugin 1933.v45cec755423f and earlier allows inlining images as `base64` in email content by setting the `data-inline` attribute, without restrictions on the image URLs that can be inlined, allowing attackers able to control the email content to specify `file:` URLs for images to read arbitrary files from the Jenkins controller filesystem.
Red Hat
jenkins-email-extension-plugin: Jenkins Email Extension Plugin: Information disclosure via arbitrary file read
vendor_redhat·2026-05-27·CVSS 8.8
CVE-2026-48920 [HIGH] CWE-22 jenkins-email-extension-plugin: Jenkins Email Extension Plugin: Information disclosure via arbitrary file read
jenkins-email-extension-plugin: Jenkins Email Extension Plugin: Information disclosure via arbitrary file read
Jenkins Email Extension Plugin 1933.v45cec755423f and earlier allows inlining images as `base64` in email content by setting the `data-inline` attribute, without restrictions on the image URLs that can be inlined, allowing attackers able to control the email content to specify `file:` URLs for images to read arbitrary files from the Jenkins controller filesystem.
A flaw was found in the Jenkins Email Extension Plugin. An attacker with the ability to control email content can exploit this vulnerability by inlining images with `file:` URLs. This allows the attacker to read arbitrary files from the Jenkins controller filesystem, leading to information disclosure.
Package: jenkins-
Jenkins
Jenkins Security Advisory 2026-05-27
vendor_jenkins·2026-05-27·CVSS 6.6
CVE-2026-48916 [MEDIUM] Jenkins Security Advisory 2026-05-27
Title: Jenkins Security Advisory 2026-05-27
Jenkins Security Advisory 2026-05-27
Jenkins Security Home
For Administrators
Overview
Terminology
Vulnerabilities and Scoring
Security Advisories
Security Issues
Advisory Schedule
Vulnerabilities in Plugins
How We Fix Security Issues
For Reporters
Reporting Vulnerabilities
Jenkins CNA
For Maintainers
Overview
Vulnerabilities in Plugins
Jenkins Security Team
About
Contributions
This advisory announces vulnerabilities in the following Jenkins deliverables:
Active Directory
Plugin
AppSpider
Plugin
Bitbucket OAuth
Plugin
buildgraph-view
Plugin
Credentials Binding
Plugin
Email Extension
Plugin
GitHub Integration
Plugin
No detection rules found.
No public exploits indexed.
2026-05-27
Published