ReservedCVE-2026-94290

    open source Fleet: security vulnerability (CVE-2026-94290)

    Published Sources: BSI, pwn.watch

    What is affected, what to do

    SUSE shipped Rancher Manager v2.15.3, v2.14.7, v2.13.11, v2.12.15 and v2.11.19 with Fleet v0.16.3, v0.15.8, v0.14.12 and v0.13.17 on Oct 29 2026, fixing six vulnerabilities. The worst is CVE-2026-94290 (CVSS 4.0 9.4 critical) in Fleet's agent management controller, which runs on the Rancher local cluster as cluster-admin: it did not restrict which kubeconfig secrets a Fleet Cluster object could reference, so an authenticated Rancher user with only the default user global role could get full cluster-admin on the management cluster, exposing every secret there, including credentials for all downstream clusters.

    Update open source Fleet to version 0.16.3, open source Fleet to version 0.14.12, open source Fleet to version 0.13.17.

    Affected
    • open source Fleet < *..0.16.3
    • open source Fleet < *..0.14.12
    • open source Fleet < *..0.13.17
    • open source Fleet < *..0.15.8
    Fixed in
    • open source Fleet 0.16.3
    • open source Fleet 0.14.12
    • open source Fleet 0.13.17
    • open source Fleet 0.15.8

    Not sure whether and how you are affected? Ask a question about this vulnerability

    Metrics

    —

    Priority

    No value is available for this vulnerability.

    —

    CVSS v3

    No value is available for this vulnerability.

    —

    EPSS score

    No value is available for this vulnerability.

    Show all metrics
    Severity
    Reserved
    Priority (0–325)

    The priority score is a consolidated metric that condenses several individual signals into a single, action-guiding ranking: technical severity (CVSS), exploitation likelihood (EPSS), known-exploited status (KEV) and the context of the affected asset. The aim is to answer the only truly important question in vulnerability management: what first?

    Read in glossary
    30.00 Methodology
    Exploit maturity

    An exploit is code or a technique that specifically uses a concrete vulnerability to force unintended behaviour — such as executing code or escalating privileges. It is the tool that turns a theoretical flaw into a practical attack.

    Read in glossary
    no public PoC known
    KEV status

    The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching.

    Read in glossary
    —
    Published

    Detection rules

    No NEOSEC detection rule is available for this vulnerability yet.

    Classification under NIS2 and CRA

    Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.

    NIS2

    NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management.

    Read in glossary
    High technical severity: assess and remediate the vulnerability in vulnerability handling under Art. 21(2)(e) NIS2 and document the decision.
    CRA

    The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates.

    Read in glossary
    From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.
    ISO/IEC 27001

    ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security.

    Read in glossary
    Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.

    Description

    SUSE shipped Rancher Manager v2.15.3, v2.14.7, v2.13.11, v2.12.15 and v2.11.19 with Fleet v0.16.3, v0.15.8, v0.14.12 and v0.13.17 on Oct 29 2026, fixing six vulnerabilities. The worst is CVE-2026-94290 (CVSS 4.0 9.4 critical) in Fleet's agent management controller, which runs on the Rancher local cluster as cluster-admin: it did not restrict which kubeconfig secrets a Fleet Cluster object could reference, so an authenticated Rancher user with only the default user global role could get full cluster-admin on the management cluster, exposing every secret there, including credentials for all downstream clusters. Fleet is enabled by default in Rancher. The release also fixes CVE-2026-104615 (high), a Fleet cluster identity takeover where a holder of a workspace registration token could claim another cluster's identity and read Secrets and ConfigMaps synced into its Fleet namespace; CVE-2026-104623 (medium), where any authenticated user could get an unprivileged shell pod on the management cluster; CVE-2026-88809 (high), a meta proxy allowlist bypass leading to server-side request forgery; CVE-2026-88811 (high), where the meta proxy leaked the caller's Rancher credentials to third-party cloud provider hosts; and CVE-2026-88810, a GlobalRole RBAC escalation fixed in v2.15.3.

    Source: BSI CSAF, BSI WID Portal, pwn.watch

    Affected products

    The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.

    Affected products
    Affected versionsFixed in
    Open SourceFleet
    • < 0.13.17
    • < 0.14.12
    • < 0.16.3
    • < 0.15.8
    • 0.13.17
    • 0.14.12
    • 0.16.3
    • 0.15.8

    Vendors and products

    References & sources

    • pwn.watchpwn.watch: Rancher and Fleet October 2026 security release: any Rancher user could become cluster-admin on the management cluster (CVE-2026-94290)pwn-watch
    • documentation.suse.comSecurity Advisories and CVEs (Rancher Manager v2.15)pwn-watch
    • github.comPrivilege escalation to cluster-admin on the Rancher local cluster through Fleet's agent management controller (GHSA-qfmw-gw96-ffcr)pwn-watch
    • github.comCluster identity takeover in Fleet cluster registration (GHSA-gx8v-2929-9q95)pwn-watch
    • github.comAuthorization bypass on the local cluster shell endpoint (GHSA-8x6f-2v58-x6p7)pwn-watch
    • github.comRancher meta proxy allowlist bypass leading to server-side request forgery (GHSA-f9gf-wh3x-jx3v)pwn-watch
    • github.comRancher credentials disclosed to third-party hosts by the Rancher Manager meta proxy (GHSA-x82x-2qj6-5rm2)pwn-watch
    • documentation.suse.comRancher Manager v2.15.3 release notespwn-watch

    Included in the same advisory

    Included in the same advisory
    Not ratedCVE-2026-88811Rancher: security vulnerability——
    Not ratedCVE-2026-88810Vulnerability CVE-2026-88810——
    Not ratedCVE-2026-88809Rancher: security vulnerability——
    MediumCVE-2026-104623SUSE Rancher: Authentication Bypass by Spoofing6.3—
    HighCVE-2026-104615SUSE Rancher: Authentication Bypass by Spoofing7.9—
    Embed badge

    Show the severity and KEV status of this vulnerability on your site – with a link back here. The image is updated hourly.

    Badge preview for CVE-2026-94290
    <a href="https://intel.neosec.eu/en/cve/CVE-2026-94290"><img src="https://intel.neosec.eu/badge/cve/CVE-2026-94290.svg?lang=en" alt="CVE-2026-94290 – NEOSEC Intel" height="20"></a>