CVE-2026-42297Public exploitNetwork attack vector

Authenticated ConfigMap manipulation via missing authorization checks

Published May 9, 2026 · Updated May 9, 2026

Missing authorization in Argo Workflows 4.0.0 through 4.0.4 allows remote authenticated users to manipulate synchronization ConfigMaps. The ConfigMap-backed Sync Service provider directly performs create, get, update, and delete operations with the server's Kubernetes client without auth.CanI checks. Argo Server in server mode or SSO mode without RBAC is exposed, allowing ConfigMap reads and writes and workflow service interruption.

CVSS severity8.5
High
EPSS probability0.52%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in Argo Workflows 4.0.0 through 4.0.4 allows remote authenticated users to manipulate synchronization ConfigMaps. The ConfigMap-backed Sync Service provider directly performs create, get, update, and delete operations with the server's Kubernetes client without auth.CanI checks. Argo Server in server mode or SSO mode without RBAC is exposed, allowing ConfigMap reads and writes and workflow service interruption.

The record

CVE
CVE-2026-42297
Published
May 9, 2026
Updated
May 9, 2026
Vendor
Argo Project
Product
Argo Workflows
Classifications
CWE-862, CWE-425, T1565.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 9, 2026CVE publishedPublication date reported by the CVE source.
  2. May 9, 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=>= 4.0.0, < 4.0.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Argo Project · Argo Workflowsversion=>= 4.0.0, < 4.0.5

Published CVSS scores

8.3Red HatCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H
8.5GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:H/SC:N/SI:H/SA:H
8.3NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-862Missing Authorization
CWE-425Direct Request ('Forced Browsing')
T1565.001Stored Data Manipulation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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