Vulnerability-Lookup

CVE-2026-44177 (GCVE-0-2026-44177)

Vulnerability from cvelistv5 – Published: 2026-07-16 21:19 – Updated: 2026-07-17 13:43

Title

Kirby: Pre-authentication path traversal and PHP file inclusion during user lookup

Summary

Kirby is an open-source content management system. In versions 5.3.0 and above but prior to 5.4.1, Kirby did not correctly validate the provided user ID, resulting in a path traversal vulnerability. Version 5.3.0 introduced a performance improvement to the Users collection that loaded user objects lazily when first needed. Users were queried by their ID, which was then used to locate the corresponding account directory under site/accounts. This affected the authentication API (accessible to unauthenticated requests), the users API (accessible only to authenticated users), and any other place that uses $users->find() to look up an individual user by a request-provided email or ID. As a result, an attacker could trigger arbitrary PHP file inclusion of files named index.php (for example, the main PHP files of plugins), the impact of which depends on the logic those files contain. It also allowed probing for the existence of arbitrary directories on the server, letting attackers fingerprint the server and site setup, including installed plugins and the content structure. This issue has been fixed in version 5.4.1.

Severity

8.8 (High)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-98 - Improper Control of Filename for Include/Require Statement in PHP Program ('PHP Remote File Inclusion')

Assigner

GitHub_M

References

2 references

URL	Tags
https://github.com/getkirby/kirby/security/adviso…	x_refsource_CONFIRM
https://github.com/getkirby/kirby/releases/tag/5.4.1	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
getkirby	kirby	Affected: >= 5.3.0, < 5.4.1

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-44177

Vulnerability from fkie_nvd - Published: 2026-07-16 22:17 - Updated: 2026-07-17 14:17

Severity

8.8 (High) - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/getkirby/kirby/releases/tag/5.4.1
	security-advisories@github.com	https://github.com/getkirby/kirby/security/advisories/GHSA-9hx7-c53c-v6x8

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "kirby",
          "vendor": "getkirby",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 5.3.0, \u003c 5.4.1"
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      ],
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    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
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    }
  ],
  "id": "CVE-2026-44177",
  "lastModified": "2026-07-17T14:17:23.013",
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GHSA-9HX7-C53C-V6X8

Vulnerability from github – Published: 2026-05-26 23:56 – Updated: 2026-05-26 23:56

Summary

Kirby CMS has pre-authentication path traversal and PHP file inclusion during user lookup

Details

TL;DR

This vulnerability affects all Kirby sites on Kirby 5.3.0-5.4.0 and is independent from setup conditions and authentication.

This vulnerability is of high severity for all Kirby sites.

Introduction

Path traversal is a type of attack that allows to access arbitrary filesystem paths. By using special elements such as .. and / separators, attackers can escape outside of the restricted location to access files or directories that are elsewhere on the system. One of the most common special elements is the ../ sequence, which in most modern operating systems is interpreted as the parent directory of the current location. Path traversal can give attackers information about the filesystem and directory structure on the server and can lead to additional attacks depending on the nature of the accessible files and directories.

PHP file inclusion is a type of attack that allows to load and execute PHP files on the server that are not intended for direct inclusion. Depending on the logic inside the PHP files, this can lead to disclosure of sensitive information or unintended, malicious actions.

Affected components

Kirby's Users collection received a performance improvement in Kirby 5.3.0. Starting in this release, Kirby loads user objects lazily when they are first needed. Users are queried by their user ID, which is then used to look up the user's account directory in the site/accounts directory.

This applies to the authentication API (accessible to unauthenticated requests), the users API (accessible to authenticated users only) as well as to other places that use $users->find() to look up an individual user with a request-provided email or user ID.

Impact

In affected releases, Kirby did not correctly validate the provided user ID, causing a path traversal vulnerability. This vulnerability results in the following impact:

Arbitrary PHP file inclusion of files with the filename index.php (e.g. the main PHP files of plugins), the impact of which depends on the contents and logic inside the includable files.
Probing of the existence of arbitrary directories on the server, which can allow attackers to fingerprint the server and site setup, including installed plugins and the content structure.

Patches

The problem has been patched in Kirby 5.4.1. Please update to this or a later version to fix the vulnerability.

In the mentioned release, Kirby has added additional checks to the user lookup that ensure that the provided user ID only contains valid characters and that the resulting path to the account directory is contained in the site/accounts directory.

Credits

Kirby thanks @offset for responsibly reporting the identified issue.

Severity

8.8 (High)


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

Show details on source website

JSON

To clipboard

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      },
      "package": {
        "ecosystem": "Packagist",
        "name": "getkirby/cms"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.3.0"
            },
            {
              "fixed": "5.4.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-44177"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-22",
      "CWE-98"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-26T23:56:40Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "### TL;DR\n\nThis vulnerability affects all Kirby sites on Kirby 5.3.0-5.4.0 and is independent from setup conditions and authentication.\n\n**This vulnerability is of high severity for all Kirby sites**.\n\n----\n\n### Introduction\n\nPath traversal is a type of attack that allows to access arbitrary filesystem paths. By using special elements such as `..` and `/` separators, attackers can escape outside of the restricted location to access files or directories that are elsewhere on the system. One of the most common special elements is the `../` sequence, which in most modern operating systems is interpreted as the parent directory of the current location. Path traversal can give attackers information about the filesystem and directory structure on the server and can lead to additional attacks depending on the nature of the accessible files and directories.\n\nPHP file inclusion is a type of attack that allows to load and execute PHP files on the server that are not intended for direct inclusion. Depending on the logic inside the PHP files, this can lead to disclosure of sensitive information or unintended, malicious actions.\n\n### Affected components\n\nKirby\u0027s `Users` collection received a performance improvement in Kirby 5.3.0. Starting in this release, Kirby loads user objects lazily when they are first needed. Users are queried by their user ID, which is then used to look up the user\u0027s account directory in the `site/accounts` directory.\n\nThis applies to the authentication API (accessible to unauthenticated requests), the users API (accessible to authenticated users only) as well as to other places that use `$users-\u003efind()` to look up an individual user with a request-provided email or user ID.\n\n### Impact\n\nIn affected releases, Kirby did not correctly validate the provided user ID, causing a path traversal vulnerability. This vulnerability results in the following impact:\n\n- Arbitrary PHP file inclusion of files with the filename `index.php` (e.g. the main PHP files of plugins), the impact of which depends on the contents and logic inside the includable files.\n- Probing of the existence of arbitrary directories on the server, which can allow attackers to fingerprint the server and site setup, including installed plugins and the content structure.\n\n### Patches\n\nThe problem has been patched in [Kirby 5.4.1](https://github.com/getkirby/kirby/releases/tag/5.4.1). Please update to this or a [later version](https://github.com/getkirby/kirby/releases) to fix the vulnerability.\n\nIn the mentioned release, Kirby has added additional checks to the user lookup that ensure that the provided user ID only contains valid characters and that the resulting path to the account directory is contained in the `site/accounts` directory.\n\n### Credits\n\nKirby thanks @offset for responsibly reporting the identified issue.",
  "id": "GHSA-9hx7-c53c-v6x8",
  "modified": "2026-05-26T23:56:40Z",
  "published": "2026-05-26T23:56:40Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/getkirby/kirby/security/advisories/GHSA-9hx7-c53c-v6x8"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/getkirby/kirby"
    },
    {
      "type": "WEB",
      "url": "https://github.com/getkirby/kirby/releases/tag/5.4.1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Kirby CMS has pre-authentication path traversal and PHP file inclusion during user lookup"
}

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.

Action not permitted

CVE-2026-44177 (GCVE-0-2026-44177)

FKIE_CVE-2026-44177

GHSA-9HX7-C53C-V6X8

TL;DR

Introduction

Affected components

Impact

Patches

Credits

Tags

Sightings

Nomenclature