⚠️ Breaking Change
Impact Score: 7/10
Argo CD v2.6.7 — Release Notes & Engineering Impact
Source available — automated, not human-reviewed
Component: argocd · Channel: stable. Automated analysis, not a compatibility certification. How this works.
Analysis updated: 2026-11-01.
Breaking-change evidence from the source
Breaking changes As part of the fix for https://github.com/argoproj/argo-cd/security/advisories/GHSA-2q5c-qw9c-fmvq, the API will now return "Unauthorized" instead of "Not found" if an Application does not exist. This change prevents leaking the existence or non-existence of Applications to unauthorized parties.
⚡ Executive Summary (TL;DR)
Argo CD v2.6.7. Source highlight: kubectl create namespace argocd
Who Does This Impact? (Role-Based Analysis)
💻 Software Engineers & Devs
Check the source notes against the package and APIs you use before upgrading.
📊 Product & Engineering Leads
Use the documented changes to assess relevance to your product; release frequency alone is not a quality measure.
⚙️ DevOps & Security
Verify the target version, runtime requirements and rollback procedure in the official documentation.
⚠️ Breaking Changes & Deprecations (1)
- Breaking changes As part of the fix for https://github.com/argoproj/argo-cd/security/advisories/GHSA-2q5c-qw9c-fmvq, the API will now return "Unauthorized" instead of "Not found" if an Application does not exist. This change prevents leaking the existence or non-existence of Applications to unauthorized parties.
📄 View Raw Release Notes (Original Developer Log)
## Quick Start
### Non-HA:
```shell
kubectl create namespace argocd
kubectl apply -n argocd -f https://raw.githubusercontent.com/argoproj/argo-cd/v2.6.7/manifests/install.yaml
```
### HA:
```shell
kubectl create namespace argocd
kubectl apply -n argocd -f https://raw.githubusercontent.com/argoproj/argo-cd/v2.6.7/manifests/ha/install.yaml
```
## Breaking changes
As part of the fix for https://github.com/argoproj/argo-cd/security/advisories/GHSA-2q5c-qw9c-fmvq, the API will now return "Unauthorized" instead of "Not found" if an Application does not exist. This change prevents leaking the existence or non-existence of Applications to unauthorized parties.
This change may break applications which depend on "Not found" responses from the Argo CD API's application endpoints.
Workarounds and potential long-term solutions will be discussed on https://github.com/argoproj/argo-cd/issues/13000.
The `argocd app create` CLI command for versions >= 2.5.0-rc1 and before this security patch is one such application which was affected. (See [upgrade notes](https://argo-cd.readthedocs.io/en/latest/operator-manual/upgrading/2.5-2.6/#argocd-app-create-for-old-cli-versions-fails-with-api-version-267) for details on that issue.)
## Release signatures
All Argo CD container images and CLI binaries are signed by cosign. See the [documentation](https://argo-cd.readthedocs.io/en/stable/operator-manual/signed-release-assets/) on how to verify the signatures.
```shell
-----BEGIN PUBLIC KEY-----
MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEesHEB7vX5Y2RxXypjMy1nI1z7iRG
JI9/gt/sYqzpsa65aaNP4npM43DDxoIy/MQBo9s/mxGxmA+8UXeDpVC9vw==
-----END PUBLIC KEY-----
```
## Upgrading
If upgrading from a different minor version, be sure to read the [upgrading](https://argo-cd.readthedocs.io/en/stable/operator-manual/upgrading/overview/) documentation.
## Changes
This release includes 1 contributions from 1 contributors with 0 features and 0 bug fixes.
### Security (1)
- MODERATE: Authenticated but unauthorized users may enumerate Application names via the API (https://github.com/argoproj/argo-cd/security/advisories/GHSA-2q5c-qw9c-fmvq)