CVE-2026-23990 is a privilege escalation vulnerability in the Flux Operator (versions 0.36.0 to 0.39.0) and ControlPlane enterprise distribution. It allows attackers to bypass Kubernetes RBAC impersonation and execute API requests with the operator's service account privileges if the OIDC provider issues tokens lacking expected claims or custom CEL expressions evaluate to empty values. Rated 5.3 MEDIUM (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N), this vulnerability requires specific misconfigurations and has a high impact on confidentiality. There is no evidence of active exploitation, public exploit code, or inclusion in the KEV catalog, though it has garnered significant community discussion with 10 mentions.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
>= 0.36.0, < 0.40.0CPE matchmatch criteria | cpe:2.3:a:control-plane:flux_operator:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.