SUSE Rancher Manager 2.15.3 Meta Proxy Allowlist Bypass
CVE-2026-88809 Published on November 2, 2026
Rancher meta proxy allowlist bypass leading to server-side request forgery
A security vulnerability exists in the SUSE Rancher Manager meta proxy endpoint (/meta/proxy). This endpoint is intended to forward requests only to destinations that appear on a configured allowlist. The allowlist decision was evaluated in a place where it could not stop a request from being forwarded, so a rejected destination was logged but the request was still handed to the proxy's transport. This affects SUSE Rancher 2.15.0 up to 2.15.3, 2.14.0 up to 2.14.7, 2.13.0 up to 2.13.11, 2.12.0 up to 2.12.15, 2.11.0 up to 2.11.19 and potentially older EOL versions.
Vulnerability Analysis
CVE-2026-88809 can be exploited with network access, and requires user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality, with no impact on integrity, and no impact on availability.
Weakness Type
What is a SSRF Vulnerability?
The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. By providing URLs to unexpected hosts or ports, attackers can make it appear that the server is sending the request, possibly bypassing access controls such as firewalls that prevent the attackers from accessing the URLs directly. The server can be used as a proxy to conduct port scanning of hosts in internal networks, use other URLs such as that can access documents on the system (using file://), or use other protocols such as gopher:// or tftp://, which may provide greater control over the contents of requests.
CVE-2026-88809 has been classified to as a SSRF vulnerability or weakness.
Products Associated with CVE-2026-88809
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Affected Versions
SUSE Rancher:- Version 2.15.0 and below 2.15.3 is affected.
- Version 2.14.0 and below 2.14.7 is affected.
- Version 2.13.0 and below 2.13.11 is affected.
- Version 2.12.0 and below 2.12.15 is affected.
- Version 2.11.0 and below 2.11.19 is affected.