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{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:jenkins:jenkins:*:*:*:*:lts:*:*:*", "matchCriteriaId": "648B5148-FE3B-464A-8963-DCF7ACEF84E5", "versionEndExcluding": "2.555.3", "vulnerable": true}, {"criteria": "cpe:2.3:a:jenkins:jenkins:*:*:*:*:-:*:*:*", "matchCriteriaId": "356A970F-6576-49B6-8EBA-E9770ED190A7", "versionEndExcluding": "2.568", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2026-53436", "lastModified": "2026-06-11T13:24:27.300", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 4.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 1.4, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}, "published": "2026-06-10T14:16:36.547", "references": [{"source": "jenkinsci-cert@googlegroups.com", "tags": ["Vendor Advisory"], "url": "https://www.jenkins.io/security/advisory/2026-06-10/#SECURITY-3711+3755"}], "sourceIdentifier": "jenkinsci-cert@googlegroups.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-601"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "jenkins: Jenkins: Phishing attacks via improper redirect URL validation", "id": "2487545", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2487545"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.3", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N", "status": "draft"}, "cwe": "CWE-601", "details": ["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.", "A flaw was found in Jenkins. The system improperly validates redirect URLs after login, specifically when they contain relative path segments such as `./` or `../`. This vulnerability allows attackers to craft malicious URLs that appear legitimate, leading to successful phishing attacks against users."], "mitigation": {"lang": "en:us", "value": "upgrade to Jenkins 2.568 or LTS 2.555.3"}, "name": "CVE-2026-53436", "package_state": [{"cpe": "cpe:/a:redhat:ocp_tools", "fix_state": "Fix deferred", "package_name": "jenkins", "product_name": "OpenShift Developer Tools and Services"}], "public_date": "2026-06-10T13:05:57Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-53436\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-53436\nhttps://www.jenkins.io/security/advisory/2026-06-10/#SECURITY-3711+3755"], "statement": "This Moderate impact flaw in Jenkins, as shipped in OpenShift Developer Tools & Services, allows attackers to conduct phishing attacks. By exploiting improper validation of redirect URLs containing relative path segments, an attacker can craft a malicious link that appears legitimate, deceiving users into revealing sensitive information.", "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[2.568,*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[2.555.3,2.556.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Jenkins", "source": "cna", "vendor": "Jenkins Project"}, "product": "jenkins", "vendor": "jenkins_project"}], "created": "2026-06-10T15:30:15.861191+00:00", "updated": "2026-06-10T17:30:36.304538+00:00", "vendors": ["jenkins_project", "jenkins_project$PRODUCT$jenkins"]}