How severe is CVE-2026-48920?

CVE-2026-48920 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-48920 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-48920?

CVE-2026-48920 primarily affects Jenkins Email Extension. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-48920?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-48920 have an EU (EUVD) identifier?

Yes. CVE-2026-48920 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-32511.

When was CVE-2026-48920 published?

CVE-2026-48920 was published on 2026-05-27 and last updated on 2026-06-17.

CVE-2026-48920

CVE-2026-48920 is a high-severity vulnerability in Jenkins Email Extension with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-73.

Key facts

Severity: High (CVSS 3.x base score 8.8)
EPSS exploit prediction: 0% (22nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-32511
Weakness: CWE-73
Affected product: Jenkins Email Extension
Published: 2026-05-27
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-48920?: 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.
How severe is CVE-2026-48920?: CVE-2026-48920 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-48920 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-48920?: CVE-2026-48920 primarily affects Jenkins Email Extension. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-48920?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-48920 have an EU (EUVD) identifier?: Yes. CVE-2026-48920 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-32511.
When was CVE-2026-48920 published?: CVE-2026-48920 was published on 2026-05-27 and last updated on 2026-06-17.

References

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

Affected products (2)

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

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