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7.6

Rancher proxy can forward disallowed requests, risking data exposure

CVE-2026-88809 · published 2 days ago
Summary

The Rancher management console’s meta‑proxy feature may send requests to sites that are not on the approved list, even though the system logs them as blocked. This could let an attacker make the server contact harmful external resources or retrieve internal information. Upgrade Rancher to the latest patched release or apply the vendor’s recommended configuration changes to enforce the allowlist correctly.

What to do
  • Update suse rancher to version 2.15.3 or later.
Affected software
VendorProductAffected versions
suse rancher < 2.15.3
Original advisory text
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.
References
Fix within
Internet-facing 60 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker partial control
Severity
7.6 High
Exploitation
<1% chance of attack within 30 days
Type
CWE-918Server-Side Request Forgery (SSRF)
Timeline
Published2 Nov 2026
Updated3 Nov 2026
First seen2 Nov 2026
Sources
CVE-2026-88809 · NVD
CVE-2026-88809 · MITRE
CVE-2026-88809 · OSV
GHSA-f9gf-wh3x-jx3v · GHSA
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