LiveActive security incident?Get immediate response
CVE Record

CVE-2026-54745: Kubeflow Pipelines: Unauthenticated SSRF and HTTP smuggling in Kubeflow Pipelines frontend /_proxy/ route, bypasses ENABLE_AUTHZ=true

Kubeflow Pipelines enables users to build and deploy portable, scalable machine learning workflows. Prior to 2.17.0, the Kubeflow Pipelines frontend exposes an unauthenticated server-side request forgery vulnerability through the /_proxy/ route in frontend/server/proxy-middleware.ts. The _routePathWithReferer() function accepts an arbitrary attacker-controlled HTTP or HTTPS target and passes its origin to createProxyMiddleware without a host allowlist or filtering for loopback, link-local, RFC1918, or cluster-local addresses. The route remains outside the authorization middleware when ENABLE_AUTHZ=true and is reachable through /apis/v1beta1/_proxy/, /apis/v2beta1/_proxy/, /pipeline/apis/v1beta1/_proxy/, and /pipeline/apis/v2beta1/_proxy/, including through a crafted Referer header. Requests can forward attacker-controlled methods, headers such as Authorization, Cookie, and X-Forwarded-For, and POST bodies to reachable internal services, while returning the upstream response to the unauthenticated client. This can expose cloud metadata credentials, Kubernetes or service APIs, and other cluster-internal endpoints to unauthorized read or modification. This issue is fixed in version 2.17.0.

CriticalCVSS 10Not KEV-listedUpdated
Glexia's TakeAutomated analysiscritical

Security readout for executives and security teams

Plain-English summary

Kubeflow Pipelines before 2.17.0 may let an unauthenticated internet or network user make the frontend contact sensitive internal services and return their responses. This could expose cloud credentials or enable unauthorized changes to Kubernetes and service APIs. Enabling authorization does not protect the affected proxy route.

Executive priority

Treat this as an emergency upgrade for reachable Kubeflow Pipelines deployments. The vulnerability crosses an authorization boundary and may turn frontend access into access to sensitive internal systems. Prioritize asset identification, upgrading to 2.17.0, log review, and credential rotation where evidence suggests internal credential exposure.

Technical view

The frontend /_proxy/ route accepts attacker-controlled HTTP or HTTPS destinations without filtering loopback, link-local, private, or cluster-local addresses. It remains outside authorization middleware when ENABLE_AUTHZ=true and can forward methods, sensitive headers, and request bodies. The supplied sources describe SSRF and HTTP smuggling risk. Version 2.17.0 contains the fix.

Likely exposure

Deployments running Kubeflow Pipelines versions earlier than 2.17.0 are affected when an attacker can reach the frontend proxy routes. Exposure is especially consequential where the frontend can access cloud metadata, Kubernetes APIs, or privileged internal services. The bundle does not establish how many deployments expose these routes publicly.

Exploitation context

The CVSS 3.1 score is 10.0, reflecting remote, unauthenticated exploitation with low complexity and potentially severe confidentiality, integrity, and availability impact. The CVE is not identified as KEV, and the supplied sources provide no evidence of active exploitation. Absence from KEV does not establish that exploitation is impossible.

Researcher notes

Affected paths include /apis/v1beta1/_proxy/, /apis/v2beta1/_proxy/, and their /pipeline-prefixed equivalents, including crafted Referer handling. The vulnerable routing passes an attacker-selected origin to proxy middleware and can relay upstream responses. Validate exposure through configuration, version, routing, and logs; avoid intrusive testing against production internal services.

Mitigation direction

  • Upgrade Kubeflow Pipelines to version 2.17.0 or later.
  • Prioritize deployments whose frontend is reachable from untrusted networks.
  • Review vendor guidance before applying any compensating control not documented in the supplied sources.
  • Rotate exposed credentials if investigation indicates access to metadata or internal authentication services.

Validation and detection

  • Inventory deployed Kubeflow Pipelines versions and confirm none are earlier than 2.17.0.
  • Map network paths from the frontend to metadata, Kubernetes, and internal service endpoints.
  • Review frontend access logs for unexpected requests involving the affected _proxy routes.
  • Check cloud, Kubernetes, and service audit logs for correlated unauthorized access or changes.
  • Confirm authorization settings were not treated as sufficient protection for these routes.
Prepared
Confidence
high
Sources
5

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · medium confidence lookup

CWE-284: Authorization and privilege behavior lookup

Authorization weaknesses can support privilege escalation and valid-account review, depending on exploit path. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

Open ATT&CK lookup
cwe · medium confidence lookup

CWE-918: Information exposure and cloud metadata lookup

Information exposure and SSRF weaknesses can make discovery, cloud metadata, and credential material review relevant. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

Open ATT&CK lookup
description · low confidence lookup

Cloud metadata behavior lookup

The CVE wording references SSRF or metadata access, so cloud discovery and credential material review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

Open ATT&CK lookup
description · low confidence lookup

Container behavior lookup

The affected technology mentions containers, so container-specific ATT&CK technique review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2026-54745 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
Critical
CVSS
10 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
3Timeline events
1ADP providers
5Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: pocAutomatable: yesTechnical Impact: total

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
10CVSS 3.1CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H3.96GitHub_M

Vulnerability scoring details

Base CVSS 3.1 score

10Critical
CVSS 3.1 vector shape for CVE-2026-54745Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
kubeflowpipelines< 2.17.0Listed
Weakness

CWE details

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-284 · source CWE mapping

Improper Access Control

Improper Access Control represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

CWE-918 · source CWE mapping

Server-Side Request Forgery (SSRF)

Server-Side Request Forgery (SSRF) represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.