---
id: "CVE-2026-127091"
page: "https://infrastack.ai/live/CVE-2026-127091"
kind: "vulnerability"
aliases: ["CVE-2026-127091"]
title: "Jadaptive Maverick Synergy: path tricks let users bypass folder access rules"
severity: "high"
cvss: 7.6
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["file-transfer", "infrastructure", "maverick-legacy", "maverick-synergy", "sftp"]
not_affected_if: ["auth-required", "single-mount-config"]
published_at: "2026-11-13T10:18:05+00:00"
first_seen_at: "2026-11-13T10:47:30+00:00"
updated_at: "2026-11-13T10:52:33+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-127091", "first_seen_at": "2026-11-13T10:47:30+00:00"}]
exploit_sources: []
---

# Jadaptive Maverick Synergy: path tricks let users bypass folder access rules

Link for people: https://infrastack.ai/live/CVE-2026-127091 (this .md is for agents)

Jadaptive Maverick Synergy Server and Maverick Legacy Server fail to normalise file paths, so a logged-in user can send paths with duplicate separators or dot segments. Those paths route requests to a less restricted parent mount, letting the user read or write files that the child mount should deny.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed Maverick Synergy Server version against the fixed ranges: `3.0.33` for the 3.0.x line and `3.1.7` for the 3.1.x line.
- Check the installed Maverick Legacy Server version against `1.8.1`.
- Review any mount-level access policies on the server, since the flaw bypasses them.

## Fix

- Maverick Synergy Server 3.0.x: upgrade to `3.0.33` or later
- Maverick Synergy Server 3.1.x: upgrade to `3.1.7` or later
- Maverick Legacy Server: upgrade to `1.8.1` or later

## Timeline

- 2026-11-13T10:47:30+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-127091

## Documents

- [advisory] Third-party advisory: www.vulncheck.com https://www.vulncheck.com/advisories/jadaptive-maverick-synergy-server-before-3.0.33-and-3.1-x-before-3.1.7-and-maverick-legacy-server-before-1.8.1-vfs-mount-policy-bypass-via-non-canonical-paths
- [fix] Patch: github.com https://github.com/sshtools/maverick-synergy/commit/f5531c21302d00901021bf2cb4dba7fca6436cfb

## From the sources

Jadaptive Maverick Synergy Server before 3.0.33 and 3.1.x before 3.1.7, and Maverick Legacy Server before 1.8.1, contain an improper path equivalence flaw in VirtualFileFactory.canonicalisePath that bypasses mount-level access policy. Authenticated users can supply paths with duplicate separators or dot segments to route operations to a less restrictive parent mount and read or write files the child mount denies.

---

_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_