SUSE Rancher up to 2.15.0 SAML Assertion Replay Protection authentication replay

Summaryinfo

A vulnerability marked as critical has been reported in SUSE Rancher up to 2.15.0. Affected by this issue is some unknown functionality of the component SAML Assertion Replay Protection. The manipulation leads to authentication replay. This vulnerability is referenced as CVE-2026-75034. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability was found in SUSE Rancher up to 2.15.0. It has been rated as critical. This issue affects an unknown code of the component SAML Assertion Replay Protection. The manipulation with an unknown input leads to a authentication replay vulnerability. Using CWE to declare the problem leads to CWE-294. A 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). Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-75034 since 08/17/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/03/2026). MITRE ATT&CK project uses the attack technique T1040 for this issue.

Upgrading to version 2.15.1 eliminates this vulnerability.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• SUSE

Name

• Rancher

Version

• 2.0
• 2.1
• 2.2
• 2.3
• 2.4
• 2.5
• 2.6
• 2.7
• 2.8
• 2.9
• 2.10
• 2.11
• 2.12
• 2.13
• 2.14
• 2.15.0

License

• open-source

Website

• Vendor: https://www.suse.com/

CPE 2.3info

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CPE 2.2info

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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