Vulnerability · Published May 27, 2026 · Assigned by jenkins

CVE-2026-48920

High 8.8

In plain English

A high-severity security flaw in Jenkins Email Extension Plugin from Jenkins Project. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 21% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.8High

Exploit odds (30 days)0.3%top 78.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Maven	org.jenkins-ci.plugins:email-ext	1933.1935.v276319e3cc47	GHSA-mq58-m26g-46gp

Affected products (as reported)

Vendor	Product	Versions
Jenkins Project	Jenkins Email Extension Plugin	0 – through 1933.v45cec755423f

Weakness: CWE-73 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

Jenkins Security Advisory 2026-05-27 vendor-advisory