CVE-2026-48920

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.

Score

CVSS 3.1 8.8 High

Status

Analyzed - jenkinsci-cert@googlegroups.com

Published

2026-05-27

Last modified

2026-10-14

Weaknesses

CWE-73

Affected products

• Email Extension (Jenkins)
• Jenkins Email Extension Plugin (Jenkins Project)

References

• https://www.jenkins.io/security/advisory/2026-05-27/#SECURITY-3705