Auth bypass in Getarcaneapp Arcane
CVE-2026-86114
Arcane versions before 2.0.0 fail to properly restrict template operations, allowing default user role accounts to create, modify, and delete compose templates including instance-wide defaults. Attackers can inject malicious container configurations with privileged settings or host path mounts that execute with administrative privileges when deployed by administrators.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.004 (35.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 36th percentile — 35.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.004 · change: +0.002
Affected products
Weakness classification (CWE)
References
- github.com/geo-chen/oss/blob/main/arcane.md (technical-description)
- github.com/getarcaneapp/arcane (product)
- github.com/getarcaneapp/arcane/blob/v1.19.5/backend/api/handlers/templates.go (technical-description)
- github.com/getarcaneapp/arcane/commit/1500646aa91f (patch)
- github.com/getarcaneapp/arcane/releases/tag/v2.0.0 (release-notes)
- www.vulncheck.com/advisories/arcane-before-2.0.0-missing-administrator-authoriz… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-86114?
- CVE-2026-86114 is a medium-severity vulnerability in Getarcaneapp Arcane, classified under Missing Authorization. CVSS score: 6.5/10. Published 2026-09-05.
- How severe is CVE-2026-86114?
- Medium severity. CVSS v3 base score is 6.5 out of 10.