How severe is CVE-2026-71403?

CVE-2026-71403 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2026-71403 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (29th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-71403?

CVE-2026-71403 affects Suse Rancher. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-71403?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2026-71403 published?

CVE-2026-71403 was published on 2026-09-03 and last updated on 2026-09-18.

CVE-2026-71403

CVE-2026-71403 is a medium-severity vulnerability in Suse Rancher with a CVSS 3.x base score of 6.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-639.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
EPSS exploit prediction: 0% (29th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-639
Affected product: Suse Rancher
Published: 2026-09-03
Last modified: 2026-09-18

Description

A flaw was found in Rancher Manager. The /v3/users update path did not enforce immutability of a User resource's `username` and `principalIds` fields. A user holding the `update` verb on `users.management.cattle.io` could inject a foreign identity provider principal into any account, so that the next login by the owner of that principal was bound to the victim's account and inherited its role bindings. This issue affects Rancher: before 2.15.1.

Frequently asked questions

What is CVE-2026-71403?: A flaw was found in Rancher Manager. The /v3/users update path did not enforce immutability of a User resource's `username` and `principalIds` fields. A user holding the `update` verb on `users.management.cattle.io` could inject a foreign identity provider principal into any account, so that the next login by the owner of that principal was bound to the victim's account and inherited its role bindings. This issue affects Rancher: before 2.15.1.
How severe is CVE-2026-71403?: CVE-2026-71403 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2026-71403 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (29th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-71403?: CVE-2026-71403 affects Suse Rancher. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-71403?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2026-71403 published?: CVE-2026-71403 was published on 2026-09-03 and last updated on 2026-09-18.

References

https://github.com/rancher/rancher/pull/56616

Affected products (1)

cpe:2.3:a:suse:rancher:*:*:*:*:*:*:*:*

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