Is CVE-2023-48312 actively exploited?

No active exploitation of CVE-2023-48312 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2023-48312 be exploited remotely?

Yes. CVE-2023-48312 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2023-48312?

CVE-2023-48312 has a CVSS score of 9.8 (CRITICAL).

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CRITICAL

CVE-2023-48312

CWE-287Published: November 24, 2023· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

capsule-proxy is a reverse proxy for the capsule operator project. Affected versions are subject to a privilege escalation vulnerability which is based on a missing check if the user is authenticated based on the `TokenReview` result. All the clusters running with the `anonymous-auth` Kubernetes API Server setting disable (set to `false`) are affected since it would be possible to bypass the token review mechanism, interacting with the upper Kubernetes API Server. This privilege escalation cannot be exploited if you're relying only on client certificates (SSL/TLS). This vulnerability has been addressed in version 0.4.6. Users are advised to upgrade.

NVD Source

Risk Analysis

The capsule-proxy component fails to properly validate authentication tokens, leading to a privilege escalation vulnerability. This allows attackers to bypass security checks and interact directly with the underlying Kubernetes API.

No public exploit is known, and it is not in the CISA KEV. The vulnerability is remotely exploitable with low complexity.

Recommended Action

Upgrade to capsule-proxy version 0.4.6 or later, or utilize client certificates for authentication to mitigate the risk.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2023-48312 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

From a weakness classification perspective (CWE-287): Authentication bypass vulnerabilities allow attackers to access protected resources without valid credentials.