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CVE-2026-42880— ArgoCD ServerSideDiff is vulnerable to Kubernetes Secret Extraction

Quick assessment

Affected
argoproj argo-cd
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Argo CD是Argo开源的一个用于Kubernetes的声明性GitOps连续交付工具。 Argo CD 3.2.0至3.2.11之前版本和3.3.0至3.3.9之前版本存在信息泄露漏洞，该漏洞源于ServerSideDiff端点缺少授权和数据掩码，可能导致具有只读权限的攻击者通过Kubernetes API服务器的Server-Side Apply dry-run机制从etcd提取明文Kubernetes Secret数据。

CVSS 9.6 · Critical EPSS 0.56% · P45

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 2

VendorProduct Version RangeStatus
argoproj argo-cd >= 3.2.0, < 3.2.11 affected
>= 3.3.0, < 3.3.9 affected
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I. Basic Information for CVE-2026-42880

Vulnerability Information
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Vulnerability Title
ArgoCD ServerSideDiff is vulnerable to Kubernetes Secret Extraction
Source: CVE Program / CVE List V5
Vulnerability Description
Argo CD is a declarative, GitOps continuous delivery tool for Kubernetes. From versions 3.2.0 to before 3.2.11 and 3.3.0 to before 3.3.9, there is a missing authorization and data-masking gap in Argo CD's ServerSideDiff endpoint that allows an attacker with read-only access to extract plaintext Kubernetes Secret data from etcd via the Kubernetes API server's Server-Side Apply dry-run mechanism. This issue has been patched in versions 3.2.11 and 3.3.9.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Argo CD 信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Argo CD是Argo开源的一个用于Kubernetes的声明性GitOps连续交付工具。 Argo CD 3.2.0至3.2.11之前版本和3.3.0至3.3.9之前版本存在信息泄露漏洞，该漏洞源于ServerSideDiff端点缺少授权和数据掩码，可能导致具有只读权限的攻击者通过Kubernetes API服务器的Server-Side Apply dry-run机制从etcd提取明文Kubernetes Secret数据。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
argoproj argo-cd >= 3.2.0, < 3.2.11 -

II. Public POCs for CVE-2026-42880

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Reproduced successfully in a real sandbox · Below is the actual recording of building the environment and exploiting the vulnerability.
Success marker: VULNERABLE: Extracted Kubernetes Secret via ArgoCD ServerSideDiff mechanism (CVE-2026-42880): password=S3cretP@ssw0rd!2024 username=admin
Reproduction recording is a Pro+ exclusive
Watch the full sandbox build + live exploit recording for this CVE. Limited-time ¥499/mo.
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claude_code · 5130 chars
GitHub 复现环境（可 clone 直接跑）
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III. Intelligence Information for CVE-2026-42880

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Vendor Advisories for CVE-2026-42880 (1)

IV. Related Vulnerabilities

Same product: argo-cd
Same vendor: argoproj
Same weakness: CWE-200

V. Comments for CVE-2026-42880

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