VULNERABILITY INTELLIGENCE

CVE-2021-31999

CVSS score8.8 HIGH

EPSS probability1.05%

CISA KEVNot currently listed

Published2021-07-15

Last modified2026-06-17

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

Description

A Reliance on Untrusted Inputs in a Security Decision vulnerability in Rancher allows users in the cluster to act as others users in the cluster by forging the "Impersonate-User" or "Impersonate-Group" headers. This issue affects: Rancher versions prior to 2.5.9. Rancher versions prior to 2.4.16.

Weakness classification

meissner@suse.de: CWE-807

Primary references

meissner@suse.de — Issue Tracking, Release Notes, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 — Issue Tracking, Release Notes, Third Party Advisory