CVE-2026-93538

Q: How do I fix CVE-2026-93538?

Upgrade rancher fleet to 0.12.19 or later.

Q: Is CVE-2026-93538 being actively exploited?

Not that we know of. CVE-2026-93538 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.17% is the estimated probability that it will be exploited in the next 30 days. That is higher than 6% of all scored CVEs.

Q: How severe is CVE-2026-93538?

CVE-2026-93538 has a CVSS v3 base score of 7.1, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

Q: What does CVE-2026-93538 affect?

Published advisories record a fix for rancher fleet (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

HIGH

7.1

CVSS v3

NVD

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.

CWE-290 CWE-639Authorization Bypass Through User-Controlled Key

How to fix

Remediation Available

rancher fleetNVD

Affected:>= 0.12.0, < 0.12.19Fixed in:0.12.19CVE-2026-93538derived from NVD

Affected:>= 0.14.0, < 0.14.10Fixed in:0.14.10CVE-2026-93538derived from NVD

Affected:>= 0.16.0, < 0.16.1Fixed in:0.16.1CVE-2026-93538derived from NVD

Affected:>= 0.13.0, < 0.13.15Fixed in:0.13.15CVE-2026-93538derived from NVD

Affected:>= 0.15.0, < 0.15.6Fixed in:0.15.6CVE-2026-93538derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityLow

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

Exploit Intelligence

0.17%probability of exploitation in 30 days

6thpercentile

Low risk: more likely to be exploited than 6% of all known CVEs.

References

Vendor Advisory1

github.com

Related Vulnerabilities

Other CWE-290 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-4358	Critical	9.8	97%	KEV	-
CVE-2022-24112	Critical	9.8	96%	KEV	Fix
CVE-2022-23131	Critical	9.1	96%	KEV	-
CVE-2021-29441	High	8.6	83%	-	Fix
CVE-2019-1234	High	7.5	75%	-	-
CVE-2021-31195	Medium	6.5	74%	-	Fix

Common questions

How do I fix CVE-2026-93538?

Upgrade rancher fleet to 0.12.19 or later.

Is CVE-2026-93538 being actively exploited?

Not that we know of. CVE-2026-93538 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.17% is the estimated probability that it will be exploited in the next 30 days. That is higher than 6% of all scored CVEs.

How severe is CVE-2026-93538?

CVE-2026-93538 has a CVSS v3 base score of 7.1, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-93538 affect?

Published advisories record a fix for rancher fleet (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-10-07.