Jenkins Email Extension Plugin: Attackers able to control email content may specify `file:` URLs for images to read arbitrary files from Jenkins controller filesystem
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.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Java / Kotlin (Maven) | org.jenkins-ci.plugins:email-ext | < 1933.1935.v276319e3cc47 | 1933.1935.v276319e3cc47 |
References
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H- Weakness (CWE)
CWE-73- Platform
- Java / Kotlin (Maven)
- Package
org.jenkins-ci.plugins:email-ext- Disclosed
- 27.05.2026
- Updated
- 11.10.2026 12:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-mq58-m26g-46gp - CC BY 4.0
Vulnerability history: org.jenkins-ci.plugins:email-ext
All published vulnerabilities of this package (Java / Kotlin (Maven)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 12
- First → latest
- 05.2022 05.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Critical 2
- High 2
- Medium 7
- Low 1
Disclosures per year
- 2022: 6
- 2023: 5
- 2024: 0
- 2025: 0
- 2026: 1
-
Jenkins Email Extension Plugin: Attackers able to control email content may specify `file:` URLs for images to read arbitrary files from Jenkins controller filesystem this entry
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