Is CVE-2026-53436 in the CISA KEV catalog?

No. CVE-2026-53436 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-53436?

CVE-2026-53436 has a CVSS v3 base score of 4.3 (MEDIUM).

What is the EPSS score for CVE-2026-53436?

CVE-2026-53436 has an EPSS score of 0.28% (20th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-53436?

Upgrade jenkins to 2.555.3 or later.

CVE & CISA-KEV Catalog

CVE-2026-53436

MEDIUM

4.3

CVSS v3

NVD

Description

Jenkins 2.567 and earlier, LTS 2.555.2 and earlier improperly determines that a redirect URL after login is legitimately pointing to Jenkins when it contains relative path segments (`./` or `../`), allowing attackers to perform phishing attacks.

CWE-601Open Redirect

How to fix

Remediation Available

jenkinsNVD

Affected:< 2.555.3Fixed in:2.555.3CVE-2026-53436derived from NVD

Affected:< 2.568Fixed in:2.568CVE-2026-53436derived 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

0.28%probability of exploitation in 30 days

20thpercentile

Low risk: more likely to be exploited than 20% of all known CVEs.

References

Vendor Advisory1

jenkins.io

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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 2026-06-11.