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.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00396.

Exploitation none

Automatable no

Technical Impact total

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Jenkins Project Jenkins Email Extension Plugin unaffected
Version Status Constraints
0 affected ≤ 1933.v45cec755423f

Configuration 1 [-]

OR cpe:2.3:a:jenkins:email_extension:*:*:*:*:*:jenkins:*:*
cpe:2.3:a:jenkins:email_extension:1933.v45cec755423f:*:*:*:*:jenkins:*:*

No data.

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No data.

Project Subscriptions

Vendors Products
Jenkins Subscribe
Email Extension Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://www.jenkins.io/security/advisory/2026-05-27/#SECURITY-3705 cve-icon cve-icon
History

Thu, 28 May 2026 17:15:00 +0000

Type Values Removed Values Added
First Time appeared Jenkins
Jenkins email Extension
CPEs cpe:2.3:a:jenkins:email_extension:*:*:*:*:*:jenkins:*:*
cpe:2.3:a:jenkins:email_extension:1933.v45cec755423f:*:*:*:*:jenkins:*:*
Vendors & Products Jenkins
Jenkins email Extension

Wed, 27 May 2026 20:15:00 +0000

Type Values Removed Values Added
Title Jenkins Email Extension Plugin Image Inlining Allows Arbitrary File Reads via File URLs

Wed, 27 May 2026 16:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-73
Metrics cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Wed, 27 May 2026 15:15:00 +0000

Type Values Removed Values Added
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.
References

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: jenkins

Published:

Updated: 2026-05-27T15:43:07.808Z

Reserved: 2026-05-26T14:50:46.813Z

Link: CVE-2026-48920

cve-icon Vulnrichment

Updated: 2026-05-27T15:43:00.473Z

cve-icon NVD

Status : Analyzed

Published: 2026-05-27T15:16:31.647

Modified: 2026-05-28T17:14:10.830

Link: CVE-2026-48920

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-27T20:00:05Z

Weaknesses