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CVE-2026-75627

Bastillion Authentication Bypass via Path-Prefix Routing Mismatch

CVSS 4.0 9.3 CRITICALCVSS 3.1 9.8 CRITICALCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-75627

Published

Bastillion fails to properly validate request URI paths in its controller dispatcher, allowing unauthenticated attackers to bypass authentication filters by prefixing requests with arbitrary path segments. Attackers can access administrative controllers to read user listings, create manager accounts, and register managed systems, gaining control over SSH access to the managed fleet.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-75627

Published

Bastillion

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "bastillion-io",
                    "product": "Bastillion",
                    "defaultStatus": "unaffected",
                    "packageURL": "pkg:github/bastillion-io/Bastillion",
                    "repo": "https://github.com/bastillion-io/Bastillion",
                    "versions": [
                        {
                            "version": "0",
                            "status": "affected",
                            "lessThanOrEqual": "5.1.0",
                            "versionType": "custom"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON