# CVE-2026-75034: Rancher: SAML Assertion Replay

> Attackers can replay SAML assertions across different replicas in high-availability deployments to hijack user sessions.

- **Severity:** High 7.4 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 3 Sep 2026
- **Updated:** 4 Sep 2026

## What is CVE-2026-75034?

CVE-2026-75034 is a high-severity authentication bypass vulnerability in SUSE Rancher, published on 3 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official 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.

Weakness: CWE-294 (Authentication Bypass by Capture-replay)

## Which versions are affected by CVE-2026-75034?

It affects 1 product.


Products: Suse Rancher.

## How do I fix CVE-2026-75034?

No fix has been published for CVE-2026-75034 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-75034 being exploited?

There is no known exploitation of CVE-2026-75034 in the wild and no public exploit code.

## Other vulnerabilities in SUSE Rancher

- [CVE-2023-22647](https://insights.sbomify.com/CVE-2023-22647/): Rancher vulnerable to Privilege Escalation via manipulation of Secrets (critical 9.9)
- [CVE-2023-22651](https://insights.sbomify.com/CVE-2023-22651/): Rancher Webhook is misconfigured during upgrade process (critical 9.9)
- [CVE-2022-43757](https://insights.sbomify.com/CVE-2022-43757/): Rancher: Exposure of sensitive fields (critical 9.9)
- [CVE-2021-36782](https://insights.sbomify.com/CVE-2021-36782/): Rancher: Plaintext storage and exposure of credentials in Rancher API and cluster.management.cattle.io object (critical 9.9)
- [CVE-2021-36783](https://insights.sbomify.com/CVE-2021-36783/): Rancher: Failure to properly sanitize credentials in cluster template answers (critical 9.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-75034 and fix it if it is affected.

What it is: CVE-2026-75034 is a high-severity authentication bypass vulnerability in SUSE Rancher, published on 3 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-75034 in the wild and no public exploit code.

Affected product: SUSE Rancher. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-75034/ (Markdown: https://insights.sbomify.com/CVE-2026-75034/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-75034
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-75034
- OSV: https://osv.dev/vulnerability/CVE-2026-75034

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-75034/
Summaries are generated and may contain mistakes; the official description above is the record.