HighCVE-2026-104615

    SUSE Rancher: Authentication Bypass by Spoofing (CVE-2026-104615)

    Published Last modified Sources: CVE.org, BSI, pwn.watch

    What is affected, what to do

    A security vulnerability was discovered in SUSE Rancher Fleet's cluster registration flow, in Fleet versions before 0.12, 0.13.0 up to 0.13.17, 0.14.0 up to 0.14.12, 0.15.0 up t o 0.15.17 and 0.16.0 up to 0.16.3. The cluster identity claimed by a registration request was accepted without being bound to the registration token that the request was made with.

    Update SUSE Rancher to version 0.16.3, SUSE Rancher to version 0.15.17, SUSE Rancher to version 0.14.12.

    Affected
    • SUSE Rancher lt 0.16.0..0.16.3
    • SUSE Rancher lt 0.15.0...0.15.17
    • SUSE Rancher lt 0.14.0..0.14.12
    • SUSE Rancher lt 0.13..0.13.17
    • SUSE Rancher lte *..0.12
    Fixed in
    • SUSE Rancher 0.16.3
    • SUSE Rancher 0.15.17
    • SUSE Rancher 0.14.12
    • SUSE Rancher 0.13.17

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

    Metrics

    7.9

    Priority

    XIEM Effective CVSS: highest available CVSS rating from NVD and vendor data.

    Source: Vendor (CNA), CVSS v3

    7.9

    CVSS v3

    Severity High on the scale from 0 to 10.

    Source: CVE.org, BSI, pwn.watch

    —

    EPSS score

    No value is available for this vulnerability.

    Show all metrics
    Severity
    High
    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
    69.50 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
    XIEM Effective CVSS

    XIEM® is the tiered managed-security operating model from NEOSEC and a registered trademark of NEOSEC GmbH. It extends classic SIEM — the central collection, normalisation and correlation of security-relevant events — with endpoint forensics, network visibility and deception technology, and consolidates them into three building tiers: Sentry, Orchestrate and Command.

    Read in glossary
    7.9 Methodology
    CVSS v3

    CVSS is the globally established, open standard for assessing the technical severity of a vulnerability on a scale from 0 to 10. It describes how easily a flaw can be exploited and what damage it can cause — but not how likely its actual exploitation is. CVSS and the complementary EPSS deliberately answer different questions.

    Read in glossary
    7.9
    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
    CWE

    CWE is a catalogue of typical weakness types in software and hardware — such as flawed input validation, unsafe memory handling or poor authentication. Where a CVE names a concrete vulnerability in a concrete product, a CWE describes the underlying class of defect.

    Read in glossary
    CWE-290

    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

    A security vulnerability was discovered in SUSE Rancher Fleet's cluster registration flow, in Fleet versions before 0.12, 0.13.0 up to 0.13.17, 0.14.0 up to 0.14.12, 0.15.0 up t o 0.15.17 and 0.16.0 up to 0.16.3. The cluster identity claimed by a registration request was accepted without being bound to the registration token that the request was made with. As a result, a registration request could be associated with a managed cluster that was originally registered with a different registration token.

    Source: cvelistv5, NVD (NIST), CVE.org (MITRE), 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
    SUSERancher
    • 0.15.0. – < 0.15.17
    • 0.14.0 – < 0.14.12
    • ≤ 0.12
    • 0.16.0 – < 0.16.3
    • 0.13 – < 0.13.17
    • 0.15.17
    • 0.14.12
    • —
    • 0.16.3
    • 0.13.17
    Open SourceFleet
    • < 0.13.17
    • < 0.15.17
    • < 0.14.12
    • < 0.16.3
    • < 0.15.8
    • 0.13.17
    • 0.15.17
    • 0.14.12
    • 0.16.3
    • 0.15.8

    Vendors and products

    Weakness classes (CWE)

    • CWE-290Authentication Bypass by Spoofing

      Base

      This attack-focused weakness is caused by incorrectly implemented authentication schemes that are subject to spoofing attacks.

      Entry at MITRE CWE-290

    References & sources

    • github.comCluster identity takeover in Fleet cluster registration (GHSA-gx8v-2929-9q95)Vendor advisory, pwn-watch
    • 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.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

    Changes to this CVE

    Who changed this CVE and when: NVD (analysis, affected products, CVSS), the CVE publisher (CNA) and additional providers such as CISA (ADP).

    1. Receivedsuse.de

      CVSS V3.1: AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:L/A:H

      Weakness type: CWE-290

      Description added or changed

      Show 5 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Descriptionadded
      —
      A security vulnerability was discovered in SUSE Rancher Fleet's cluster registration flow, in Fleet versions before 0.12, 0.13.0 up to 0.13.17, 0.14.0 up to 0.14.12, 0.15.0 up t o 0.15.17 and 0.16.0 up to 0.16.3. The cluster identity claimed by a registration request was accepted without being bound to the registration token that the request was made with. As a result, a registration request could be associated with a managed cluster that was originally registered with a different registration token.
      CVSSadded
      —
      AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:L/A:H
      Weakness type (CWE)added
      —
      CWE-290
      Affected versions (publisher)added
      —
      New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/104xxx/CVE-2026-104615.json">CVE-2026-104615</a>
      Referenceadded
      —
      https://github.com/rancher/fleet/security/advisories/GHSA-gx8v-2929-9q95

      Source identifier: meissner@suse.de

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