External Control of File Name or Path in Email Extension - CVE-2026-48920
Published: May 28, 2026
Vulnerability identifier: #VU132682
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-48920
CWE-ID: CWE-73
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Jenkins
Affected software:
Email Extension
Email Extension
Detailed vulnerability description
The vulnerability allows a remote attacker to read arbitrary files.
The vulnerability exists due to application allows inlining images as "base64" in email content by setting the "data-inline" attribute, without restrictions on the image URLs that can be inlined. A remote user can read arbitrary files from the Jenkins controller filesystem.
How to mitigate CVE-2026-48920
Install updates from vendor's website.