What is CVE-2019-12303?

CVE-2019-12303 is a high-severity vulnerability in SUSE Rancher, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 8.8/10. Published 2019-06-06.

How severe is CVE-2019-12303?

High severity. CVSS v3 base score is 8.8 out of 10.

Vulnerability in SUSE Rancher

CVE-2019-12303

In Rancher 2 through 2.2.3, Project owners can inject additional fluentd configuration to read files or execute arbitrary commands inside the fluentd container.

Published 2019-06-06 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.020 (79.7th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 80th percentile — 79.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.020 · newest: 0.020 · change: -0.000

Affected products

SUSE Rancher

Weakness classification (CWE)

CWE-74 — Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection)

References

forums.rancher.com/c/announcements (Release Notes, Vendor Advisory)
forums.rancher.com/t/rancher-release-v2-2-4-addresses-rancher-cve-2019-12274-an… (Release Notes, Vendor Advisory)

Frequently asked questions

What is CVE-2019-12303?: CVE-2019-12303 is a high-severity vulnerability in SUSE Rancher, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 8.8/10. Published 2019-06-06.
How severe is CVE-2019-12303?: High severity. CVSS v3 base score is 8.8 out of 10.