Is CVE-2026-53440 in the CISA KEV catalog?

No. CVE-2026-53440 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-53440?

CVE-2026-53440 has a CVSS v3 base score of 4.3 (MEDIUM).

What is the EPSS score for CVE-2026-53440?

CVE-2026-53440 has an EPSS score of 0.24% (15th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-53440?

Upgrade jenkins to 2.555.3 or later.

CVE & CISA-KEV Catalog

CVE-2026-53440

MEDIUM

4.3

CVSS v3

NVD

Description

Jenkins 2.567 and earlier, LTS 2.555.2 and earlier does not ensure that the "from" parameter in the "Delegate to servlet container" security realm is safe to redirect to after login, allowing attackers to perform phishing attacks by redirecting users to an attacker-controlled domain.

CWE-601Open Redirect

How to fix

Remediation Available

jenkinsNVD

Affected:< 2.555.3Fixed in:2.555.3CVE-2026-53440derived from NVD

Affected:< 2.568Fixed in:2.568CVE-2026-53440derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityLow

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

Exploit Intelligence

0.24%probability of exploitation in 30 days

15thpercentile

Low risk: more likely to be exploited than 15% of all known CVEs.

References

Vendor Advisory1

jenkins.io

Embed a live status badge for CVE-2026-53440

Markdown

[![CVE-2026-53440](https://tridentstack.com/cve/badge/CVE-2026-53440.svg)](https://tridentstack.com/cve/CVE-2026-53440)

HTML

<a href="https://tridentstack.com/cve/CVE-2026-53440"><img src="https://tridentstack.com/cve/badge/CVE-2026-53440.svg" alt="CVE-2026-53440"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-12.