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Jenkins EUVDEUVD-2026-112185

| CVE-2026-117620 CRITICAL
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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

  1. Access
    Authenticate to Jenkins with a required permission
  2. Exploit
    Submit crafted request or configuration (exact trigger for CVE-2026-117620 not described in sources)
  3. Impact
    Impact not determined from available data

Vulnerability Assessment

Exploitation Conditions

The exploitation prerequisites for CVE-2026-117620 are not described in the available sources - the per-CVE entry is absent from the supplied advisory text, so no exact product feature, permission, or configuration can be named for this identifier. By contrast, the other vulnerabilities disclosed in the same Jenkins advisory 2026-10-28 each require an authenticated account holding a specific permission (e.g., Overall/Read plus a non-anonymous account, Item/Configure, Agent/Configure, or Item/Create), and the two XSS issues (-117613, -117621) are noted as mitigated by enforcing Content Security Policy on Jenkins 2.539+/LTS 2.541.1+. Whether any of these conditions apply to -117620 cannot be confirmed; consult the CVE-2026-117620 entry at https://www.jenkins.io/security/advisory/2026-10-28/ to establish the exact prerequisites and limiting factors.

Impact

Risk cannot be confidently scored for CVE-2026-117620 specifically: the supplied oss-security post and Jenkins advisory 2026-10-28 are a bulk 'Multiple vulnerabilities in Jenkins' bundle that individually detail CVE-2026-117612, -117613, -117614, -117615, -117616, -117617, -117621 and -117622, but do NOT contain a standalone description for CVE-2026-117620, so its mechanism, impact and required privileges are not described in the available sources. No CVSS base vector is provided (both linked Jenkins pages report CVSS/CVE Vector/CWE as N/A), no EPSS probability is supplied, the vuln.today Decision label is 'awaiting_data', the CVE is not listed in CISA KEV, and no proof-of-concept or exploit reference appears among the references (all four are vendor/mailing-list advisories). Signals therefore do not conflict so much as they are absent: this is an unscored, data-incomplete entry rather than a confirmed high-priority or confirmed low-risk issue. Contextually, every vulnerability that IS described in this same advisory requires authenticated Jenkins access with a specific permission (Overall/Read, Item/Configure, Agent/Configure, or Item/Create), so it is likely - but not confirmed for -117620 - that this CVE also requires an authenticated account rather than anonymous network access; verify against the per-CVE entry at the Jenkins advisory before prioritizing.

Exploit ScenarioDerived

The specific attack scenario for CVE-2026-117620 cannot be constructed because the vulnerability is not individually described in the provided advisory text; the trigger, affected component, and impact are not stated in the available sources. The sibling vulnerabilities fixed in the same release (Jenkins 2.588 / LTS 2.580.2) are exploited by an authenticated user abusing a */Configure or Overall/Read permission to submit crafted configuration or requests to the controller. No public exploit code is referenced for this CVE.

Act Now Prioritize within 24-48h. Why: CRITICAL severity.
No patch listed yet

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AnalysisAIv1 – Oct 28, 2026

CVE-2026-117620 is one of the vulnerabilities covered by the Jenkins security advisory of 2026-10-28, fixed in Jenkins 2.588 and Jenkins LTS 2.580.2, but the supplied advisory text and oss-security post do not include a standalone description for this specific identifier. By contrast, the sibling CVEs detailed in the same bundle are permission-gated issues (XStream deserialization RCE under SECURITY-4125, stored XSS via crafted job config.xml under SECURITY-4225, command agent launcher RCE, symlink-based file read/write flaws, and an unvalidated agent-loading endpoint) and are not reported as actively exploited. The exact mechanism, impact, and required permissions for CVE-2026-117620 remain unconfirmed from the available sources; no public exploit code is identified for it and the decision label is awaiting_data.

RemediationAI

Upgrade to Jenkins 2.588 or Jenkins LTS 2.580.2, the releases that contain the fixes for the vulnerabilities in advisory 2026-10-28, and review the per-CVE entry for CVE-2026-117620 at https://www.jenkins.io/security/advisory/2026-10-28/ to confirm which of the bundled issues applies to your instance. The advisory states that Jenkins 2.588/LTS 2.580.2 also enforces the XStream type permissions system, and that administrators who encounter problems with it can disable it by setting the Java system property hudson.util.XStream2.SUPPRESS_TYPE_PERMISSION to true, accepting the corresponding reduction in deserialization protection. For the XSS issues disclosed alongside this CVE, the advisory notes that enforcing Content Security Policy on Jenkins 2.539 or newer and LTS 2.541.1 or newer mitigates the known impact, which is a compensating control rather than a substitute for upgrading. No mitigating control specific to CVE-2026-117620 is described in the available sources, so consult the advisory for any prerequisites and workarounds before relying on one.

Affected VersionsENISA

Jenkins patch: 2.588
Jenkins patch: 2.580.2

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Technical ContextAI · show details

Jenkins is a Java-based automation server that persists configuration and build state via XStream, and defends deserialization with a JEP-200 allowlist filter plus custom converters; the advisory's other entries show the surrounding attack surface includes XStream's resolves-to attribute handling, unrestricted collection element types (leading to stored XSS), legacy agent launch command conversion, symlink-following during item rename and artifact extraction, and an agent-loading HTTP endpoint that accepts arbitrary config.xml paths. The advisory also notes that Jenkins 2.588/LTS 2.580.2 additionally adopt the XStream type permission system, disableable via the Java system property hudson.util.XStream2.SUPPRESS_TYPE_PERMISSION, and that CSP enforcement on Jenkins 2.539+/LTS 2.541.1+ mitigates the known XSS impact. No CWE, CVSS vector, or CPE data is provided for CVE-2026-117620, so neither the root-cause class nor the exact affected component can be attributed to this identifier; consult the advisory page for the corresponding SECURITY-xxxx entry.

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Description PRE-NVD

Disclosed via oss-security. NVD scoring and full description are pending.

Executive ViewAI

Why It Matters

A critical-severity vulnerability (CVE-2026-117620) affects Jenkins automation servers, with fixes released in Jenkins 2.588 and Jenkins LTS 2.580.2. The specific impact for this CVE remains unconfirmed, but Jenkins often holds privileged credentials and orchestrates CI/CD pipelines, so a critical flaw could enable unauthorized access or disruption. Leadership should prioritize patching to protect software delivery integrity and avoid business interruption.

Business Impact: High
Compensating Controls

Apply vendor patch.

Threat Intelligence Overview

Prevalence
High
Jenkins is a widely deployed enterprise CI/CD automation server
Data Quality
2 sources
Confidence: Low

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity CRITICAL
CISA KEV No
Public POC No
EPSS N/A
Patch available No
Active threat No
Deciding rule
CRITICAL severity
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

Attack Technique

Code Injection CRITICAL

Code injection occurs when an application accepts user input and passes it directly into a language interpreter or evaluator without proper sanitization.

CVE-2023-44487 HIGH POC
7.5 Oct 10

Denial of service against HTTP/2 server implementations allows remote unauthenticated attackers to exhaust server resour

CVE-2019-1003030 CRITICAL POC
9.9 Mar 08

A sandbox bypass vulnerability exists in Jenkins Pipeline: Groovy Plugin 2.63 and earlier in pom.xml, src/main/java/org/

CVE-2015-8103 CRITICAL POC
9.8 Nov 25

The Jenkins CLI subsystem in Jenkins before 1.638 and LTS before 1.625.2 allows remote attackers to execute arbitrary co

CVE-2016-9299 CRITICAL POC
9.8 Jan 12

The remoting module in Jenkins before 2.32 and LTS before 2.19.3 allows remote attackers to execute arbitrary code via a

CVE-2016-0792 HIGH POC
8.8 Apr 07

Multiple unspecified API endpoints in Jenkins before 1.650 and LTS before 1.642.2 allow remote authenticated users to ex

CVE-2015-5317 HIGH
7.5 Nov 25

The Fingerprints pages in Jenkins before 1.638 and LTS before 1.625.2 might allow remote attackers to obtain sensitive j

CVE-2016-0788 CRITICAL
9.8 Apr 07

The remoting module in Jenkins before 1.650 and LTS before 1.642.2 allows remote attackers to execute arbitrary code by

CVE-2019-1003029 CRITICAL POC
9.9 Mar 08

A sandbox bypass vulnerability exists in Jenkins Script Security Plugin 1.53 and earlier in src/main/java/org/jenkinsci/

CVE-2018-1000861 CRITICAL POC
9.8 Dec 10

A code execution vulnerability exists in the Stapler web framework used by Jenkins 2.153 and earlier, LTS 2.138.3 and ea

CVE-2019-1003005 HIGH POC
8.8 Feb 06

A sandbox bypass vulnerability exists in Jenkins Script Security Plugin 1.50 and earlier in src/main/java/org/jenkinsci/

CVE-2019-1003002 HIGH POC
8.8 Jan 22

A sandbox bypass vulnerability exists in Pipeline: Declarative Plugin 1.3.3 and earlier in. Rated high severity (CVSS 8.

CVE-2019-1003001 HIGH POC
8.8 Jan 22

A sandbox bypass vulnerability exists in Pipeline: Groovy Plugin 2.61 and earlier in src/main/java/org/jenkinsci/plugins

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