Rancher is widely used to manage Kubernetes clusters; an unauthenticated UI XSS can lead to session theft and compromise of cluster management.
CVE-2026-88804
Unauthenticated stored XSS in Rancher UI enabling remote script execution
Is CVE-2026-88804 being exploited?
Not confirmed. CVE-2026-88804 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.54% probability of exploitation in the next 30 days.
How severe is CVE-2026-88804?
CVE-2026-88804 is rated Critical with a CVSS score of 9.6. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-88804?
Yes. A fix has been recorded for CVE-2026-88804. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-88804 affect?
CVE-2026-88804 affects SUSE Rancher 2.15 (<2.15.2), SUSE Rancher 2.14 (<2.14.6), SUSE Rancher 2.13 (<2.13.10), SUSE Rancher 2.12 (<2.12.14), and 1 further product or version. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-88804?
Upgrade to patched versions, restrict UI exposure, and rotate sessions/credentials.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated stored XSS; attackers can run JS in admin/user browsers, steal sessions, perform CSRF, and potentially compromise cluster management.
Immediate action required
- affected>= 2.15.0 and < 2.15.2
- affected>= 2.14.0 and < 2.14.6
- affected>= 2.13.0 and < 2.13.10
- affected>= 2.12.0 and < 2.12.14
- affected>= 2.11.0se and < 2.11.18
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.