CVE-2023-3893 | Kubernetes - csi-proxy - Insufficient input sanitization leads to privilege escalation

A security issue was discovered in Kubernetes where a user that can create pods on Windows nodes running kubernetes-csi-proxy may be able to escalate to admin privileges on those nodes. Kubernetes clusters are only affected if they include Windows nodes running kubernetes-csi-proxy.

Published: 2023-11-03 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2023-3893 is rated Moderate Risk (64.1/100): CVSS High severity, with medium exploitation likelihood (EPSS 2.86%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2023-3893

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 3.69% 2.86% -0.83%
2 2025-11-21 0.65% 3.69% +3.04%
3 2025-11-18 — 0.65% —

Full EPSS history (19 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2023-3893

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.8 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 5.9 [email protected]
8.8 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 5.9 [email protected]

Weakness enumeration for CVE-2023-3893

GitHub Security Advisory for CVE-2023-3893

GHSA-r6cc-7wj7-gfx2 · Severity: high · Ecosystem: go — Kubernetes csi-proxy vulnerable to privilege escalation due to improper input validation

OS Trackers for CVE-2023-3893

vendor priority summary link
debian not yet assigned CVE-2023-3893 not yet assigned priority: Debian including 1 source packages (kubernetes), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2023-3893
redhat high — https://access.redhat.com/security/cve/CVE-2023-3893
suse high CVE-2023-3893 severity important: SUSE including 26 source package names (kubernetes, kubernetes-client, …), 181 product×package rows across 19 product lines (SUSE CaaS Platform 4.0, SUSE Enterprise Storage 7.1, … (19 product lines)): Known Not Affected 181. https://www.suse.com/security/cve/CVE-2023-3893/
ubuntu medium CVE-2023-3893 medium priority: Ubuntu including 1 source packages (kubernetes), 6 status rows across 6 suites (focal, jammy, noble, oracular, plucky, upstream): not-affected 3, DNE 1, ignored 1, needs-triage 1. https://ubuntu.com/security/CVE-2023-3893

Affected software / configurations for CVE-2023-3893

Vendor Product Version Raw CPE
kubernetes csi_proxy <= 1.1.2 cpe:2.3:a:kubernetes:csi_proxy:*:*:*:*:*:*:*:*
kubernetes csi_proxy 2.0.0 cpe:2.3:a:kubernetes:csi_proxy:2.0.0:alpha0:*:*:*:*:*:*

References for CVE-2023-3893

cvelogic Threat Intelligence