CVE-2026-42461— Arcane Vulnerable to Unauthenticated Disclosure of Custom Compose Template Content (incl. `.env` secrets)
Quick assessment
Affected
getarcaneapp arcane
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.
arcane是Arcane开源的一个Docker管理软件。 Arcane 1.18.0之前版本存在安全漏洞，该漏洞源于/api/templates*下的四个GET端点未设置安全要求，可能导致任何未经身份验证的网络客户端列出和读取所有自定义模板的完整Compose YAML和.env内容。
Public Exploits 1
Nuclei · 1
CVE-2026-42461.yaml [template]
Possible ATT&CK Techniques 1 AI
T1530 · Data from Cloud StorageAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| getarcaneapp | arcane | < 1.18.0 |
affected |
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I. Basic Information for CVE-2026-42461
Vulnerability Information
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Vulnerability Title
Arcane Vulnerable to Unauthenticated Disclosure of Custom Compose Template Content (incl. `.env` secrets)
Source: CVE Program / CVE List V5
Vulnerability Description
Arcane is an interface for managing Docker containers, images, networks, and volumes. Prior to version 1.18.0, four GET endpoints under /api/templates* in Arcane's Huma backend are registered without any Security requirement, allowing any unauthenticated network client to list and read the full Compose YAML and .env content of every custom template stored in the instance. Because Arcane's UI exposes a "Save as Template" flow on the project / swarm-stack creation pages that persists the operator's real env content (database passwords, API keys, etc.) verbatim, this missing authorization is an unauthenticated read of operator secrets in practice — not a theoretical info-disclosure. The frontend explicitly treats /customize/templates/* as an authenticated area (PROTECTED_PREFIXES in frontend/src/lib/utils/redirect.util.ts), and every CRUD operation (POST/PUT/DELETE) on the same paths requires a Bearer/API key, so this is a clear backend authorization gap, not intended public access. This issue has been patched in version 1.18.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
arcane 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
arcane是Arcane开源的一个Docker管理软件。 Arcane 1.18.0之前版本存在安全漏洞，该漏洞源于/api/templates*下的四个GET端点未设置安全要求，可能导致任何未经身份验证的网络客户端列出和读取所有自定义模板的完整Compose YAML和.env内容。
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 |
|---|---|---|---|---|
| getarcaneapp | arcane | < 1.18.0 | - |
|
II. Public POCs for CVE-2026-42461
| # | POC Description | Source Link | Shenlong Link |
|---|---|---|---|
| 1 | Arcane < 1.18.0 contains an information disclosure caused by missing authorization on /api/templates GET endpoints, letting unauthenticated network clients read sensitive Compose YAML and .env content, exploit requires network access | https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-42461.yaml | POC Details |
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Vendor Advisories for CVE-2026-42461 (1)
IV. Related Vulnerabilities
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Same vendor: getarcaneapp
-
CVE-2026-86114
Arcane before 2.0.0 Missing Administrator Authorization on t -
CVE-2026-45625
Arcane: Missing admin authorization on git repository endpoi -
CVE-2026-45626
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CVE-2026-45627
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CVE-2026-47125
Arcane: Missing admin authorization on global variables endp
Same weakness: CWE-862
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CVE-2026-108891
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CVE-2026-108888
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JeecgBoot through 3.9.5 Missing Authorization via /sys/comme -
CVE-2026-108886
JeecgBoot through 3.9.5 Missing Authorization via /sys/user/ -
CVE-2026-108885
JeecgBoot through 3.9.5 Missing Authorization via /sys/messa
V. Comments for CVE-2026-42461
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