CVE-2026-48920 Jenkins Email Extension Plugin: Attackers able to control email content may specify `file:` URLs for images to read arbitrary files from Jenkins controller filesystem
Attackers controlling email content can read arbitrary files from the Jenkins controller filesystem by specifying file URLs in inline images.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-48920?
CVE-2026-48920 is a high-severity path traversal vulnerability in Jenkins Email Extension Plugin, published on 27 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.
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.
Weakness: CWE-73
Which versions are affected by CVE-2026-48920?
2 open source packages ship an affected version, including org.jenkins-ci.plugins:email-ext. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
org.jenkins-ci.plugins:email-ext Maven | All versions | 1933.1935.v276319e3cc47 |
org.jenkins-ci.plugins:email-ext Maven | All versions | 1933.1935.v276319e3cc47 |
Products include Jenkins Email Extension.
How do I fix CVE-2026-48920?
Upgrade org.jenkins-ci.plugins:email-ext to 1933.1935.v276319e3cc47 or later.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-48920 being exploited?
There is no known exploitation of CVE-2026-48920 in the wild and no public exploit code.
Other vulnerabilities in Jenkins Email Extension Plugin
- CVE-2023-25765 Sandbox escape in Jenkins Email Extension Plugin
- CVE-2019-1003032 Script security sandbox bypass in Jenkins Email Extension Plugin
- CVE-2020-2232 Jenkins Email Extension Plugin SMTP password transmitted and displayed in plain text
- CVE-2018-1000176 Jenkins Email Extension Plugin showed plain text SMTP password in configuration form field
- CVE-2023-25763 Cross-site Scripting in Jenkins Email Extension Plugin
Sources
Also known as GHSA-mq58-m26g-46gp.