CVE-2026-48920

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.

PUBLISHED Reserved 2026-05-26 | Published 2026-05-27 | Updated 2026-05-27 | Assigner jenkins

Product status

References

www.jenkins.io/security/advisory/2026-05-27/ (Jenkins Security Advisory 2026-05-27) vendor-advisory

cve.org (CVE-2026-48920)

nvd.nist.gov (CVE-2026-48920)

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