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    CVE-2026-84655

    Jenkins 2.579 and earlier, LTS 2.568.2 and earlier does not escape map keys when serializing objects as JSON and Python through its REST API, allowing attackers able to control map property names to inject arbitrary fields into JSON and Python API responses.

    Published:Sep 2, 2026
    Last Modified:Sep 3, 2026
    EPS:Sep 2, 2026
    EPSS Score:0.00192
    CVSS Score:4.3

    Affected Products

    Vendor
    Jenkins Project
    Product
    Jenkins

    Exploits

    No exploit reference

    Related CVEs

    CVE-2026-84657 (CVSS 4.2) — In Jenkins 2.579 and earlier, LTS 2.568.2 and earlier, the build CLI command does not check the Item/Cancel pe…
    CVE-2026-84656 (CVSS 4.3) — A missing permission check in Jenkins 2.579 and earlier, LTS 2.568.2 and earlier allows attackers with Item/Re…
    CVE-2026-84654 (CVSS 5.4) — In Stapler 2107.v8dfcb_e8ed317 and earlier, except 2088.2093.vd7c3e58008a_6, included in Jenkins 2.579 and ear…
    CVE-2026-84653 (CVSS 3.5) — Jenkins 2.421 through 2.579 (both inclusive), LTS 2.426.1 through 2.568.2 (both inclusive) does not correctly …
    CVE-2026-84652 (CVSS 7.3) — In Jenkins 2.579 and earlier, LTS 2.568.2 and earlier, Jenkins does not rotate the session when a user is auth…
    CVE-2026-84651 (CVSS 6.3) — In Jenkins 2.579 and earlier, LTS 2.568.2 and earlier, the REST API and CLI endpoints for updating agent confi…
    CVE-2026-84650 (CVSS 8.8) — In Jenkins 2.579 and earlier, LTS 2.568.2 and earlier, transient fields cannot be excluded from deserializatio…
    CVE-2026-84648 (CVSS 8.8) — In Jenkins 2.579 and earlier, LTS 2.568.2 and earlier, the system log viewer does not escape log record metada…
    CVE-2026-84649 (CVSS 8.8) — In Stapler 1839.ved17667b_a_eb_5 through 2107.v8dfcb_e8ed317 (both inclusive), except 2088.2093.vd7c3e58008a_6…
    CVE-2026-84647 (CVSS 8.8) — In Stapler 2107.v8dfcb_e8ed317 and earlier, except 2088.2093.vd7c3e58008a_6, included in Jenkins 2.579 and ear…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High