# CVE-2026-88979: Kubeflow Pipelines: Unauthenticated SSRF vulnerability in Kubeflow Pipelines TensorBoard proxy

Status: published. Published: 2026-11-05. Updated: 2026-11-05.

Kubeflow Pipelines enables users to build and deploy portable, scalable machine learning workflows. From 2.17.0 until 2.18.0, the TensorBoard proxy token introduced by the incomplete remediation for CVE-2026-54745 uses MINIO_SECRET_KEY as its HMAC secret, whose bundled default is publicly known. In an authorization-disabled deployment using that default, an unauthenticated attacker can forge a token containing a chosen viewerName and namespace; the proxy constructs the destination from the viewerName plus the -service suffix, the namespace, and the configured cluster domain, then reads responses on port 80 under the /tensorboard/<viewer>/ path. Resource-name validation and path-traversal rejection remain enforced, authorization-enabled deployments still check access to the selected namespace, and unrestricted metadata access, writes, or service disruption are not established. This issue is fixed in version 2.18.0.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- kubeflow / pipelines: >= 2.17.0, < 2.18.0 (affected). Source: CNA: GitHub_M

## Severity and prioritization

- CVSS 3.1: 5.8 (medium); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N; source: CNA: GitHub_M

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-798, CWE-918

## Exploit evidence

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

## References

- https://github.com/kubeflow/pipelines/security/advisories/GHSA-j429-j7xw-8j9h (CNA: GitHub_M; x_refsource_CONFIRM)

- https://github.com/kubeflow/pipelines/pull/14346 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/kubeflow/pipelines/commit/c8effaed62476a8d8c99d3a6cfdd404a04ef99d8 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/kubeflow/pipelines/releases/tag/2.18.0 (CNA: GitHub_M; x_refsource_MISC)

## Provenance

- CNA: GitHub_M: https://www.cve.org/CVERecord?id=CVE-2026-88979; retrieved 2026-11-05; source updated 2026-11-05

Revision: 21e5b83c312bdb909b0314809521fde809ba48581f28d270a175d77b39b80ec5

Canonical: https://y2.dev/cve/CVE-2026-88979

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