Vulnerability-Lookup

CVE-2026-75627 (GCVE-0-2026-75627)

Vulnerability from cvelistv5 – Published: 2026-08-18 10:46 – Updated: 2026-08-18 18:06

Title

Bastillion Authentication Bypass via Path-Prefix Routing Mismatch

Summary

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.

Severity

9.3 (Critical)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

9.8 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: poc Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-18 18:06 UTC

CWE

CWE-288 - Authentication Bypass Using an Alternate Path or Channel

Assigner

VulnCheck mitre root

References

5 references

URL	Tags
https://github.com/bastillion-io/Bastillion/issues/669	issue-tracking
https://github.com/bastillion-io/Bastillion	product
https://github.com/bastillion-io/Bastillion/commi…	patch
https://github.com/bastillion-io/Bastillion/blob/…	technical-description
https://www.vulncheck.com/advisories/bastillion-a…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version	CPE status
bastillion-io	Bastillion	Affected: 0 , ≤ 5.1.0 (custom)	guessed

Date Public

2026-08-17 00:00

Credits

George Chen

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-75627

Vulnerability from fkie_nvd - Published: 2026-08-18 11:16 - Updated: 2026-08-18 18:19

Severity

9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Summary

References

	URL	Tags
	disclosure@vulncheck.com	https://github.com/bastillion-io/Bastillion
	disclosure@vulncheck.com	https://github.com/bastillion-io/Bastillion/blob/master/src/main/java/loophole/mvc/base/BaseKontroller.java
	disclosure@vulncheck.com	https://github.com/bastillion-io/Bastillion/commit/d759fb686a1a097b1b026e286fd9b20e5ba349c8
	disclosure@vulncheck.com	https://github.com/bastillion-io/Bastillion/issues/669
	disclosure@vulncheck.com	https://www.vulncheck.com/advisories/bastillion-authentication-bypass-via-path-prefix-routing-mismatch
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/bastillion-io/Bastillion/issues/669

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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  ],
  "sourceIdentifier": "disclosure@vulncheck.com",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-288"
        }
      ],
      "source": "disclosure@vulncheck.com",
      "type": "Secondary"
    }
  ]
}

GHSA-9V44-G22G-QFG5

Vulnerability from github – Published: 2026-08-18 12:31 – Updated: 2026-08-18 12:31

Details

Severity

9.8 (Critical)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

9.3 (Critical)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Show details on source website

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{
  "affected": [],
  "aliases": [
    "CVE-2026-75627"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-288"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-18T11:16:52Z",
    "severity": "CRITICAL"
  },
  "details": "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.",
  "id": "GHSA-9v44-g22g-qfg5",
  "modified": "2026-08-18T12:31:21Z",
  "published": "2026-08-18T12:31:20Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-75627"
    },
    {
      "type": "WEB",
      "url": "https://github.com/bastillion-io/Bastillion/issues/669"
    },
    {
      "type": "WEB",
      "url": "https://github.com/bastillion-io/Bastillion/commit/d759fb686a1a097b1b026e286fd9b20e5ba349c8"
    },
    {
      "type": "WEB",
      "url": "https://github.com/bastillion-io/Bastillion"
    },
    {
      "type": "WEB",
      "url": "https://github.com/bastillion-io/Bastillion/blob/master/src/main/java/loophole/mvc/base/BaseKontroller.java"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/bastillion-authentication-bypass-via-path-prefix-routing-mismatch"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

CVE-2026-75627 (GCVE-0-2026-75627)

FKIE_CVE-2026-75627

GHSA-9V44-G22G-QFG5

Tags

Sightings

Nomenclature