CyberSecBulletin
CVE-2026-93538NVD status: Analyzed

Rancher: Authentication Bypass by Spoofing

Published Updated By the CyberSecBulletin desk

CVE-2026-93538 is a high-severity authentication bypass by spoofing vulnerability in Rancher from SUSE, with a CVSS 3.1 base score of 7.1 out of 10. It can be exploited remotely over the network by an attacker with a low-privileged account, without any action from a user. The record lists versions 0.16.1, 0.15.6, 0.14.10 as the first without the flaw, so updating Rancher to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.17% chance of exploitation within 30 days, which is low compared with other CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update Rancher to 0.16.1 or 0.15.6 or 0.14.10 or 0.13.15, whichever matches your release line, or a later version.
  2. Update Rancher Fleet to 0.12.19 or 0.13.15 or 0.14.10 or 0.15.6, whichever matches your release line, or a later version.
  3. Read the advisory on github.com for workarounds and exact fixed builds.

Affected products and versions

VendorProductAffected versionsFixed in
SUSERancher0.16.0 up to, but not including, 0.16.1; 0.15.0 up to, but not including, 0.15.6; 0.14.0 up to, but not including, 0.14.10; 0.13.0 up to, but not including, 0.13.15; 0.12.0 up to, but not including, 0.12.190.16.1, 0.15.6, 0.14.10, 0.13.15, 0.12.19
SUSERancher Fleet0.12.0 up to, but not including, 0.12.19; 0.13.0 up to, but not including, 0.13.15; 0.14.0 up to, but not including, 0.14.10; 0.15.0 up to, but not including, 0.15.6; 0.16.0 up to, but not including, 0.16.10.12.19, 0.13.15, 0.14.10, 0.15.6, 0.16.1

Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
NetworkCan be exploited remotely over a network, including the internet.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
LowA basic user account is enough.
User interaction
NoneNo action by a victim is required.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
HighAll data handled by the component can be read.
Integrity
LowLimited modification of data is possible.
Availability
NoneAvailability is not affected.

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N. Scored by CNA (suse.de).

Official description

A cross-tenant authorization issue was discovered in SUSE Rancher Fleet. During agent-initiated cluster registration, cluster labels supplied by the registering agent, including labels in the reserved management.cattle.io/ namespace such as the cluster display name label, were applied to the resulting upstream Cluster object. Because Fleet resolves GitRepo and Bundle targets from those cluster labels, a party able to register a cluster into a Fleet workspace namespace shared with other tenants could cause its own cluster to satisfy targeting rules that administrators intended for a different cluster. This affects SUSE Rancher Fleet 0.16 before 0.16.1, 0.15 before 0.15.6, 0.14 before 0.14.10, 0.13 before 0.13.15, 0.12 before 0.12.19 and older versions.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Authentication Bypass by Spoofing

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

More Authentication Bypass by Spoofing vulnerabilities (CWE-290)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: partial).
  3. Record last changed materially (score, affected products, status or references).

References

Other vulnerabilities in Rancher

All Rancher vulnerabilities

Recent Authentication Bypass by Spoofing vulnerabilities

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