CVE-2026-28229Public exploitNetwork attack vector

Template disclosure via unauthenticated informer-backed reads

Published Mar 11, 2026 · Updated Mar 11, 2026

Incorrect authorization in Argo Workflows 3.7.0 through 3.7.10 and 4.0.0 through 4.0.1 allows remote attackers to read templates. The GetWorkflowTemplate and GetClusterWorkflowTemplate handlers return objects from informer stores using the server service account while performing instance-ID validation but no request authorization. An unauthenticated network client can supply an invalid nonempty bearer token to retrieve template data, including embedded Secret manifests, environment variables, artifact locations, and service-account use.

CVSS severity9.1
Critical
EPSS probability0.65%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Incorrect authorization in Argo Workflows 3.7.0 through 3.7.10 and 4.0.0 through 4.0.1 allows remote attackers to read templates. The GetWorkflowTemplate and GetClusterWorkflowTemplate handlers return objects from informer stores using the server service account while performing instance-ID validation but no request authorization. An unauthenticated network client can supply an invalid nonempty bearer token to retrieve template data, including embedded Secret manifests, environment variables, artifact locations, and service-account use.

The record

CVE
CVE-2026-28229
Published
Mar 11, 2026
Updated
Mar 11, 2026
Vendor
Argo Project
Product
Argo Workflows
Classifications
CWE-863, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=< 3.7.11
  2. Affected versionversion=>= 4.0.0, < 4.0.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Argo Project · Argo Workflowsversion=< 3.7.11; version=>= 4.0.0, < 4.0.2

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
9.1Argo Project GitHub Security AdvisoryCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
7.5Red Hat Product SecurityCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-863Incorrect Authorization
T1190Exploit Public-Facing Application

Public exploit references

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

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo