GHSA-r642-gv9p-2wjj
CRITICALArgo CD will blindly trust JWT claims if anonymous access is enabled
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/v2🐹github.com/argoproj/argo-cd/v2🐹github.com/argoproj/argo-cd/v2🐹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
A critical vulnerability has been discovered in Argo CD which would allow unauthenticated users to impersonate as any Argo CD user or role, including the admin user, by sending a specifically crafted JSON Web Token (JWT) along with the request. In order for this vulnerability to be exploited, anonymous access to the Argo CD instance must have been enabled.
In a default Argo CD installation, anonymous access is disabled. To find out if anonymous access is enabled in your instance, please see the Workarounds section of this advisory below.
The vulnerability can be exploited to impersonate as any user or role, including the built-in admin account regardless of whether that account is enabled or disabled. Also, the attacker does not need an account on the Argo CD instance in order to exploit this.
If anonymous access to the instance is enabled, an attacker can:
-
Escalate their privileges, effectively allowing them to gain the same privileges on the cluster as the Argo CD instance, which is cluster admin in a default installation. This will allow the attacker to create, manipulate and delete any resource on the cluster.
-
Exfiltrate data by deploying malicious workloads with elevated privileges, thus bypassing any redaction of sensitive data otherwise enforced by the Argo CD API
We strongly recommend that all users of Argo CD update to a version containing this patch as soon as possible, regardless of whether or not anonymous access is enabled in your instance.
Please see below for a list of versions containing a fix for this vulnerability and any possible workarounds existing for this issue.
Patches
A patch for this vulnerability has been released in the following Argo CD versions:
- v2.3.4
- v2.2.9
- v2.1.15
Workarounds
Disable anonymous access
If you are not able to upgrade to a patched version quickly, we highly suggest disabling anonymous access if it is enabled.
To find out whether anonymous access is enabled for your Argo CD instance, you can query the argocd-cm ConfigMap in the Argo CD's installation namespace. The below example assumes you have installed Argo CD to the argocd namespace:
$ kubectl get -n argocd cm argocd-cm -o jsonpath='{.data.users\.anonymous\.enabled}'
If the result of this command is either empty or "false", anonymous access to that instance is not enabled. If the result is "true", your instance is vulnerable.
To disable anonymous access, patch the argocd-cm ConfigMap to either remove the users.anonymous.enabled field or set this field to "false".
To set the field to "false":
$ kubectl patch -n argocd cm argocd-cm --type=json -p='[{"op":"add", "path":"/data/users.anonymous.enabled", "value":"false"}]'
Or you can remove the field completely, thus disabling anonymous access because the default is false:
$ kubectl patch -n argocd cm argocd-cm --type=json -p='[{"op":"remove", "path":"/data/users.anonymous.enabled"}]'
Credits
The Argo CD team would like to thank Mark Pim and Andrzej Hajto, who discovered this vulnerability and reported it in a responsible way to us.
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/v2 | ≥ 2.3.0&&< 2.3.4 | 2.3.4 |
| 🐹Go | github.com/argoproj/argo-cd/v2 | ≥ 2.2.0&&< 2.2.9 | 2.2.9 |
| 🐹Go | github.com/argoproj/argo-cd/v2 | all versions | 2.1.15 |
| 🐹Go | github.com/argoproj/argo-cd | all versions | 2.1.15 |
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/v2. 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/v2 to 2.3.4 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-r642-gv9p-2wjj 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-r642-gv9p-2wjj 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-r642-gv9p-2wjj. 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-r642-gv9p-2wjj in your dependencies?
O3 detects GHSA-r642-gv9p-2wjj across Go dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.