CVE-2026-75034: suse rancher Authentication Bypass by Capture-replay

Vulnerability summary

CVE-2026-75034 is a high (CVSS 7.4) Authentication Bypass by Capture-replay vulnerability in suse rancher. EPSS estimates a 0.32% chance of exploitation in the next 30 days, higher than 24% of scored vulnerabilities.

Timeline

1. 03-09-2026
   PublishedVulnerability first disclosed.
2. 04-09-2026
   Last modifiedVulnerability information updated.

Description

A flaw was found in Rancher Manager. The SAML assertion replay protection introduced by the fix for CVE-2026-44946 recorded consumed assertion IDs in a per-process cache, so each replica only detected replays that reached the same pod. In a high-availability deployment, an attacker holding a captured assertion could replay it once against every other replica to obtain additional authenticated sessions as the victim. This issue affects Rancher: before 2.15.1.

• CWE-294Authentication Bypass by Capture-replayA capture-replay flaw exists when the design of the product makes it possible for a malicious user to sniff network traffic and bypass authentication by replaying it to the server in question to the same effect as the original message (or with minor changes).