CVE-2026-48920

Jenkins Email Extension Plugin Image Inlining Allows Arbitrary File Reads via File URLs

Published May 27, 2026 CVSS 3.1 · 8.8 High EPSS < 1% KEV · Not listed
Description
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

Sign in to view the affected projects.

Advisories

Source ID Title
Github GHSA Github GHSA GHSA-mq58-m26g-46gp Jenkins Email Extension Plugin: Attackers able to control email content may specify `file:` URLs for images to read arbitrary files from Jenkins controller filesystem
History
Type Values Removed Values Added
First Time appeared Jenkins Project
Jenkins Project jenkins Email Extension Plugin
Vendors & Products Jenkins Project
Jenkins Project jenkins Email Extension Plugin
Type Values Removed Values Added
First Time appeared Jenkins
Jenkins email Extension
CPEs cpe:2.3:a:jenkins:email_extension:*:*:*:*:*:jenkins:*:*
cpe:2.3:a:jenkins:email_extension:1933.v45cec755423f:*:*:*:*:jenkins:*:*
Vendors & Products Jenkins
Jenkins email Extension
Type Values Removed Values Added
Title Jenkins Email Extension Plugin Image Inlining Allows Arbitrary File Reads via File URLs
Type Values Removed Values Added
Weaknesses CWE-73
Metrics cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description 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.
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
jenkins
Published
Updated
May 27, 2026, 3:43 PM
Reserved
May 26, 2026, 2:50 PM
Status
Analyzed
Published
May 27, 2026, 3:16 PM
Modified
Oct 14, 2026, 8:10 PM