Quick answers
- Is CVE-2026-75034 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-75034 being exploited in the wild.
- How severe is CVE-2026-75034?
- High severity, with a CVSS score of 7.4, published 3 September 2026.
- Which products and versions are affected?
- Rancher Manager before 2.15.1.
- Is there a fix for CVE-2026-75034?
- A patch was published on 2026-08-28: Fixed in v2.15.1 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-75034 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-75034?
- Check whether you run Suse Rancher. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The vulnerability is a replay attack in the SAML authentication handler. The fix for CVE-2026-44946 introduced assertion replay protection, but it tracked consumed assertion IDs only in a per-process, in-memory cache. In multi-replica deployments, each replica maintains a separate cache, so an attacker with a valid SAML assertion can replay it against multiple replicas to obtain additional authenticated sessions. The attack requires network access to the SAML endpoint and a previously captured valid SAML assertion, but no authentication credentials. The fix validates assertion IDs across all replicas to prevent cross-replica replay attacks. This affects all SAML providers integrated with Rancher.
Affected products
- Rancher Manager before 2.15.1
Timeline
- 2026-09-03: disclosed
- 2026-08-28: patched: Fixed in v2.15.1