Missing Authorization Affecting github.com/controlplaneio-fluxcd/flux-operator/internal/web/user package, versions >=0.36.0 <0.40.0
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-GOLANG-GITHUBCOMCONTROLPLANEIOFLUXCDFLUXOPERATORINTERNALWEBUSER-15054353
- published22 Jan 2026
- disclosed21 Jan 2026
- creditUnknown
Introduced: 21 Jan 2026
CVE-2026-23990 (opens in a new tab)How to fix?
Upgrade github.com/controlplaneio-fluxcd/flux-operator/internal/web/user to version 0.40.0 or higher.
Overview
Affected versions of this package are vulnerable to Missing Authorization via improper validation of OIDC token claims after processing through CEL expressions. An attacker can gain unauthorized operator-level read access and perform actions such as suspend, resume, or reconcile by authenticating with a token that results in empty username and groups values, causing API requests to execute with elevated service account privileges.
Workaround
This vulnerability can be mitigated by making the email and groups claims required in the web config impersonation section.