GHSA-3jfq-742w-xg8j
CRITICALUsers with any cluster secret update access may update out-of-bounds cluster secrets
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
Blast Radius
github.com/argoproj/argo-cd🐹github.com/argoproj/argo-cd🐹github.com/argoproj/argo-cd🐹github.com/argoproj/argo-cdReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.
Description
Impact
All Argo CD versions starting with v2.3.0-rc1 are vulnerable to an improper authorization bug which allows users who have the ability to update at least one cluster secret to update any cluster secret.
The attacker could use this access to escalate privileges (potentially controlling Kubernetes resources) or to break Argo CD functionality (by preventing connections to external clusters).
How the Attack Works
Argo CD stores cluster access configurations as Kubernetes Secrets. To take advantage of the vulnerability, an attacker must know the server URL for the cluster secret they want to modify.
The attacker must be authenticated with the Argo CD API server, and they must be authorized to update at least one (non project-scoped) cluster. Then they must craft a malicious request to the Argo CD API server.
Removing Deployment Restrictions
A cluster Secret's clusterResources field determines whether Argo CD users may deploy cluster-scoped resources to that cluster. The namespaces field determines the namespaces to which Argo CD users may deploy resources.
You can use this command to determine whether any of your cluster configurations employ these restrictions (replace argocd with the namespace of your Argo CD installation):
kubectl get secret -n argocd -l 'argocd.argoproj.io/secret-type=cluster' -ojson | jq '.items |
map(.data |= with_entries(.value |= @base64d)) | # base64-decode secrets
map(select(.data | (
(.clusterResources != null and .clusterResources == "false") or # we deny cluster-scoped resource management
(.namespaces != null and .namespaces != "") # we are only managing certain clusters
)) | .metadata.name)'
The clusterResources and namespaces fields are one line of defense against unauthorized management of Kubernetes resources. Users should also have AppProject and RBAC restrictions in place.
If clusterResources: "false" or namespaces: "some,namespaces" are the only mechanisms preventing an attacker from maliciously managing certain resources via Argo CD, then this vulnerability could allow that attacker to manage out-of-bounds resources via Argo CD (create, get, update, delete).
Modifying Connection Parameters
Cluster secrets also hold client configuration for connecting to the remote cluster. One option is to skip TLS certificate verification. An attacker could disable certificate verification in an effort to achieve a malicious-in-the-middle (MITM) attack.
Alternatively, an attacker could apply an invalid configuration (for example, by setting an invalid bearer token) and achieve a denial-of-service by preventing Argo CD from managing the target cluster.
Changing Unscoped Clusters to be Scoped
The vulnerability also allows an attacker to modify a previously-unscoped cluster and make it scoped. This is important if you are using permitOnlyProjectScopedClusters: true in a project under which the attacker can deploy. By scoping a previously-unscoped cluster under that project, they can grant themselves the ability to manage resources on the target cluster.
Patches
A patch for this vulnerability has been released in the following Argo CD versions:
- v2.6.2
- v2.5.11
- v2.4.23
- v2.3.17
Workarounds
The best way to mitigate the vulnerability is to upgrade. The following two sections explain other ways to mitigate the vulnerability if you are currently unable to upgrade.
Limit Users with Cluster Update Access
The only complete mitigation besides upgrading is to modify your RBAC configuration to completely revoke all clusters, update access.
To exploit this vulnerability, an attacker must have access to update at least one cluster configuration. Check your RBAC configuration, for lines like this:
p, role:developers, clusters, update, *, allow
p, role:developers, clusters, *, *, allow
p, role:developers, *, update, *, allow
Revoke clusters, update access for any users who do not absolutely need that access.
Restrict Resource Management via AppProjects and RBAC
AppProjects are a primary tool to restrict what resources may be managed via Argo CD.
You can use the destinations and clusterResourceWhitelist fields to apply similar restrictions as the namespaces and clusterResources fields described above.
apiVersion: argoproj.io/v1alpha1
kind: AppProject
spec:
destinations:
# Only allow Applications managed by this AppProject to manage to the `allowed-namespace` namespace.
- namespace: 'allowed-namespace'
server: 'https://your-server'
# Do not allow Applications managed by this AppProject to manage any cluster-scoped resources.
clusterResourceWhitelist: []
Along with adding AppProject restrictions, make sure that your RBAC restrictions are strict enough.
For example, limit projects, update access to Argo CD administrators only. Also use the {project} field in applications, *, {project}/{application} field to limit users' access to certain, restricted, AppProjects.
AppProject restrictions can only prevent Applications from managing out-of-bounds resources. It cannot prevent an attacker from maliciously changing cluster connection TLS configuration.
For more information
- Open an issue in the Argo CD issue tracker or discussions
- Join us on Slack in channel #argo-cd
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐹Go | github.com/argoproj/argo-cd | ≥ 2.3.0&&< 2.3.17 | 2.3.17 |
| 🐹Go | github.com/argoproj/argo-cd | ≥ 2.4.0&&< 2.4.23 | 2.4.23 |
| 🐹Go | github.com/argoproj/argo-cd | ≥ 2.5.0&&< 2.5.11 | 2.5.11 |
| 🐹Go | github.com/argoproj/argo-cd | ≥ 2.6.0&&< 2.6.2 | 2.6.2 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/argoproj/argo-cd. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Fix
Update github.com/argoproj/argo-cd to 2.3.17 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-3jfq-742w-xg8j is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 pinpoints whether GHSA-3jfq-742w-xg8j is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.
Tailored to GHSA-3jfq-742w-xg8j. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is GHSA-3jfq-742w-xg8j in your dependencies?
O3 detects GHSA-3jfq-742w-xg8j across Go dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.