High severity · published May 27, 2026
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…
8.8
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 21% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
JE
Jenkins Email Extension Plugin · Jenkins Project
through 1933.v45cec755423f · source: vendor
EE
Email Extension · Jenkins
through 1925.v1598902b_58dd; 1933.v45cec755423f · source: NVD
Affected product
JE
Jenkins Email Extension Plugin
Jenkins Project
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-48920
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-48920
Vendor Advisory
https://www.jenkins.io/security/advisory/2026-05-27/#SECURITY-3705
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