CVE-2026-19274Network attack vector

Cross-tenant RBAC hijacking via namespace-blind resource names

Published Sep 4, 2026 · Updated Sep 4, 2026

Improper access control in IBM Instana Agent Operator builds 1.0.303 through 1.0.323 allows remote authenticated users to alter cluster RBAC. Cluster-scoped RBAC objects use only an InstanaAgent custom resource's bare name as their key, without its namespace, so same-named resources collide across tenants. A tenant able to create an InstanaAgent resource can overwrite a victim's ClusterRoleBinding or delete the colliding resource, revoking the victim agent's cluster-monitoring access.

CVSS severity9.6
Critical
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in IBM Instana Agent Operator builds 1.0.303 through 1.0.323 allows remote authenticated users to alter cluster RBAC. Cluster-scoped RBAC objects use only an InstanaAgent custom resource's bare name as their key, without its namespace, so same-named resources collide across tenants. A tenant able to create an InstanaAgent resource can overwrite a victim's ClusterRoleBinding or delete the colliding resource, revoking the victim agent's cluster-monitoring access.

The record

CVE
CVE-2026-19274
Published
Sep 4, 2026
Updated
Sep 4, 2026
Vendor
IBM
Product
IBM Instana Agent
Classifications
CWE-284, T1098.003
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 4, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=Build 1.0.303 <=1.0.323

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

IBM · IBM Instana Agentversion=Build 1.0.303 <=1.0.323

Published CVSS scores

9.6IBMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-284Improper Access Control
T1098.003Additional Cloud Roles

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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