# CVE-2026-88809: Rancher meta proxy allowlist bypass leading to server-side request forgery

Status: published. Published: 2026-11-02. Updated: 2026-11-02.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- SUSE / Rancher (Rancher): ≥ 2.15.0; < 2.15.3 (affected, semver); ≥ 2.14.0; < 2.14.7 (affected, semver); ≥ 2.13.0; < 2.13.11 (affected, semver); ≥ 2.12.0; < 2.12.15 (affected, semver); ≥ 2.11.0; < 2.11.19 (affected, semver). Source: CNA: suse

## Severity and prioritization

- CVSS 3.1: 7.6 (high); CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:L/A:N; source: CNA: suse

- CVSS 3.1: 7.6 (high); CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:L/A:N; source: NVD: meissner@suse.de

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-918

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/rancher/rancher/security/advisories/GHSA-f9gf-wh3x-jx3v (CNA: suse; vendor-advisory)

- https://github.com/rancher/rancher/security/advisories/GHSA-f9gf-wh3x-jx3v (meissner@suse.de)

## Provenance

- CNA: suse: https://www.cve.org/CVERecord?id=CVE-2026-88809; retrieved 2026-11-02; source updated 2026-11-02

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-88809; retrieved 2026-11-02; source updated 2026-11-02

Revision: 618c9dc505d216661c2ba41e104b223380671abe01bb14bfcc184196c6d3a0fc

Canonical: https://y2.dev/cve/CVE-2026-88809

## Agent and API access

Public CVE pages, Markdown, and JSON are free to read without an account or API key.

- Public catalog: https://y2.dev/cve/index.json. Follow nextCursor with the same search, filters, sort, and limit (1–100). A null cursor marks the end.

- WebMCP: search_cve_disclosures, get_cve_disclosure, get_cve_page_markdown, get_y2_cve_access. Available in compatible browsers.

- Cyber API: https://api.y2.dev/api/v2/cyber/cves and https://api.y2.dev/api/v2/cyber/cves/{cveId}.

- Y2 Pro or Elite: create a workspace API key with the intel:cyber scope and send Authorization: Bearer <Y2_API_KEY>. Setup: https://y2.dev/docs/api/create-key.

- x402: Pay per request without an account or API key. Omit Authorization, read the HTTP 402 PAYMENT-REQUIRED challenge, validate its current requirements, and retry with PAYMENT-SIGNATURE through an authorized payment client. These browser tools never make payments. Guide: https://y2.dev/docs/api/x402.

- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

Collected public records only. Check source status for coverage and freshness.