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GHSA-mq58-m26g-46gp

Jenkins Email Extension Plugin: Attackers able to control email content may specify `file:` URLs for images to read arbitrary files from Jenkins controller filesystem

Source: GitHub Advisory Database (reviewed) High CVE-2026-48920

Packages

EcosystemPackageAffectedFixed in
Maven org.jenkins-ci.plugins:email-ext < 1933.1935.v276319e3cc47 1933.1935.v276319e3cc47

Details

As written in the advisory (Markdown source, shown as plain text).

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.

References

External links from the advisory. They lead to third-party sites.