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Jenkins CVE-2026-84646

| EUVDEUVD-2026-70112 MEDIUM
Deserialization of Untrusted Data (CWE-502)
2026-09-02 jenkins GHSA-8wrx-j32g-7fcf
4.3
CVSS 3.1 · Vendor: jenkins
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Severity by source

Vendor (jenkins) PRIMARY
4.3 MEDIUM
AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
vuln.today AI
4.3 MEDIUM

Network-reachable via Jenkins API; Overall/Read is low privilege (PR:L); impact is user-object creation only, no confidentiality or availability effect.

3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Red Hat
4.3 MEDIUM
qualitative

Primary rating from Vendor (jenkins).

CVSS VectorVendor: jenkins

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None

Lifecycle Timeline

4
Analysis Generated
Sep 02, 2026 - 18:29 vuln.today
CVSS changed
Sep 02, 2026 - 18:22 NVD
4.3 (MEDIUM)
CVE Published
Sep 02, 2026 - 15:40 cve.org
UNKNOWN (no severity yet)
CVE Published
Sep 02, 2026 - 15:40 cve.org
MEDIUM 4.3

DescriptionCVE.org

In Jenkins 2.579 and earlier, LTS 2.568.2 and earlier, user objects can appear as nested field values in other deserialized XML objects, allowing attackers with Overall/Read permission to create user objects by submitting crafted XML.

AnalysisAI

XML deserialization in Jenkins 2.579 and earlier (LTS 2.568.2 and earlier) allows any authenticated user holding the minimal Overall/Read permission to inject crafted XML that causes the server to instantiate user objects as nested field values within other deserialized structures, producing unauthorized modifications to the Jenkins user database. The root cause is CWE-502 - insufficient type filtering during XML deserialization - which permits user-typed objects to be materialized outside normal user-creation workflows. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
technique details hidden
Delivery
technique details hidden
Exploit
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Execution
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Impact
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Vulnerability AssessmentAI

Exploitation Exploitation requires a valid Jenkins account with the Overall/Read permission, which is the baseline permission assigned to virtually all authenticated users in default Jenkins configurations - it is not a privileged role. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The provided CVSS 3.1 vector (AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N, score 4.3) accurately captures the bounded nature of this flaw: it is network-reachable with low complexity, but requires at minimum a valid Jenkins account with Overall/Read, and the impact is confined to a low-integrity write (user-object creation) with no confidentiality or availability consequence. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Upgrade Jenkins weekly builds to version 2.580 or later, or upgrade Jenkins LTS installations to version 2.568.3 or later; both fix versions are confirmed in the EUVD affected-versions data and the Jenkins security advisory at https://www.jenkins.io/security/advisory/2026-09-02/#SECURITY-3908. … Detailed patch versions, workarounds, and compensating controls in full report.

Threat intelligence, references, and detailed analysis are available after sign-in.

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CVE-2026-84646 vulnerability details – vuln.today

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