CVE-2026-48920: Jenkins Email Extension Plugin 1933.v45cec755423f and earlier allows inlining images as `base64` in email cont

Q: How do I fix CVE-2026-48920?

email extension: upgrade to newer than 1925.v1598902b_58dd. Exact commands for each OS are on this page.

Q: Is CVE-2026-48920 being exploited?

CVE-2026-48920 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-48920 affect?

CVE-2026-48920 affects email extension. Severity is high (CVSS 8.8). 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

Routine

HIGH 8.8UPGRADE

CVE-2026-48920 is a high-severity flaw (CVSS 8.8) affecting email extension. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 79%)
CISA exploited list	No
Weakness	CWE-73
Published	2026-05-27
Last modified	2026-10-14

Publisher (CNA): Jenkins Project · Vendor: jenkins

Last updated 2026-10-14 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-27 15:16 UTCPublished CVE record published
2026-10-14 20:10 UTCUpdated Record last modified

jenkins email extension UPGRADE

Affected: <= 1925.v1598902b_58dd · 1933.v45cec755423f

Fixed in: newer than 1925.v1598902b_58dd

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy email-extension || rpm -q email-extension || email-extension --version

2. UPGRADE to newer than 1925.v1598902b_58dd (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade email-extension

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade email-extension

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-48920?

email extension: upgrade to newer than 1925.v1598902b_58dd. Exact commands for each OS are on this page.

Is CVE-2026-48920 being exploited?

CVE-2026-48920 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-48920 affect?

CVE-2026-48920 affects email extension. Severity is high (CVSS 8.8). 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

How urgent is CVE-2026-48920?

Priority 36/100. High severity

Software pages

Jenkins vulnerabilities

References

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