GitHub Advisoryadvisory · Maven

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

HIGH Published 2026-05-27 Modified 2026-07-01 Official page ↗
Aliases
CVE-2026-48920
Ecosystem
Maven
Packages
org.jenkins-ci.plugins:email-ext
Severity
High
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weaknesses
CWE-73
Reviewed
2026-07-01

Affected packages

• Maven org.jenkins-ci.plugins:email-ext: < 1933.1935.v276319e3cc47 → fixed in 1933.1935.v276319e3cc47

Description

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.

Related

Alias · CVE (1)

  • CVE-2026-48920 Jenkins Email Extension Plugin 1933.v45cec755423f and earlier allows inlining images as `base64` in email content by setting the… vulnerability

Weakness · CWE (1)

  • CWE-73 External Control of File Name or Path weakness

References