Vulnerability in Jenkins Email Extension
CVE-2026-48920
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.005 (41.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 41st percentile — 41.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.005 · change: +0.002
Affected products
- Jenkins Email Extension — versions 1933.v45cec755423f
- Jenkins Project Email Extension Plugin — versions 0
Weakness classification (CWE)
References
- www.jenkins.io/security/advisory/2026-05-27/ (vendor-advisory, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-48920?
- CVE-2026-48920 is a high-severity vulnerability in Jenkins Email Extension, classified under External Control of File Name or Path. CVSS score: 8.8/10. Published 2026-05-27.
- How severe is CVE-2026-48920?
- High severity. CVSS v3 base score is 8.8 out of 10.