CVE-2026-75034
HighCVSS 7.4Exploitation Probability (EPSS)
Low risk10th percentile - higher than 10% of all known CVEs
Summary
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.
Risk Assessment
An attacker could gain unauthorized access to user sessions in a multi-replica Rancher environment, potentially leading to account takeover and security breaches.
Recommendation
Upgrade Rancher Manager to version 2.15.1 or later, which includes the fix. Consider implementing additional mechanisms to detect SAML assertion replays.
Other vulnerabilities in Rancher Manager
See all- CVE-2026-44939Critical
CVE-2026-44939 describes a command injection vulnerability in the Rancher Manager import endpoint before version 2.14.2, potentially allowing the execution of malicious containers.
- CVE-2026-75035High
A flaw was found in Rancher Manager. When a non-administrative caller supplied a label selector naming a different user, the ext.cattle.io/v1 Token store dropped its internal owner filter instead of returning an empty result. Any authenticated user could therefore list and watch every other user's tokens, disclosing token metadata and the stored salted hash of the bearer token. This issue affects Rancher before 2.15.1.
- CVE-2026-75033High
In Rancher Manager, project secrets were propagated into a namespace based only on the `field.cattle.io/projectId` annotation, without verifying that the project belonged to the same downstream cluster. A user able to create namespaces could set the annotation to a project ID from another cluster and have that project's secrets copied into a namespace under their control.
- CVE-2026-71404High
In Rancher Manager, the GlobalRole controller derived the target ClusterRole name from the user-settable `authz.management.cattle.io/cr-name` annotation and overwrote that object's rules without verifying ownership. A user with delegated GlobalRole create or update permission could point the annotation at any existing ClusterRole, such as `cluster-admin`, and revoke the permissions of every principal bound to it.
- CVE-2026-71403Medium
A flaw was found in Rancher Manager. The /v3/users update path did not enforce immutability of a User resource's `username` and `principalIds` fields. A user holding the `update` verb on `users.management.cattle.io` could inject a foreign identity provider principal into any account, so that the next login by the owner of that principal was bound to the victim's account and inherited its role bindings. This issue affects Rancher before 2.15.1.
- CVE-2024-58269Medium
A vulnerability has been identified in Rancher Manager, where sensitive information, including secret data, cluster import URLs, and registration tokens, is exposed to any entity with access to Rancher audit logs.
- CVE-2025-54468Medium
A vulnerability has been identified within Rancher Manager whereby `Impersonate-Extra-*` headers are being sent to an external entity, for example `amazonaws.com`, via the `/meta/proxy` Rancher endpoint. These headers may contain identifiable and/or sensitive information e.g. email addresses.
Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS