Vulnerability-Lookup

CVE-2026-44175 (GCVE-0-2026-44175)

Vulnerability from cvelistv5 – Published: 2026-07-16 21:36 – Updated: 2026-07-17 13:11

Title

Kirby: Cross-site scripting (XSS) from list field content in the site frontend

Summary

Kirby is an open-source content management system. In versions prior to 4.9.1 and 5.4.1, Kirby did not securely sanitize the contents of the list field on save, leaving it vulnerable to cross-site scripting (XSS). Kirby's list field stores its formatted content as HTML, and unlike other field types, its HTML special characters cannot be escaped without losing the formatting. Sanitization was only enforced client-side in the Panel, while the server did not sanitize the content on save. As a result, an attacker could bypass the Panel and send malicious HTML directly to Kirby's API, storing unsanitized markup in the content file. That markup would then be rendered on the site frontend and executed in the browsers of site visitors and logged-in users browsing the site, resulting in persistent XSS. This issue has been fixed in versions 4.9.1 and 5.4.1.

Severity

8.5 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-17 13:11 UTC

CWE

CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7994 records in the last 180 days details

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	CPE status
getkirby	kirby	Affected: < 4.9.1 Affected: >= 5.0.0, < 5.4.1	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-44175

Vulnerability from fkie_nvd - Published: 2026-07-16 22:17 - Updated: 2026-10-24 20:10

Severity

8.5 (High) - CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/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-5fhx-9q32-q257

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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    },
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      "lang": "es",
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    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/getkirby/kirby/security/advisories/GHSA-5fhx-9q32-q257"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

GHSA-5FHX-9Q32-Q257

Vulnerability from github – Published: 2026-05-26 23:49 – Updated: 2026-05-26 23:49

Summary

Kirby CMS vulnerable to cross-site scripting (XSS) from list field content in the site frontend

Details

TL;DR

This vulnerability affects all Kirby sites that use the list field or list block, when content is authored by users who may not be fully trusted. The attack requires an authenticated Panel user with update permission to any list field or list block.

This vulnerability is of high severity for affected sites.

Kirby sites are not affected if they don't use the list field (or blocks field with the list block) in any of their blueprints, or if every user who can edit content is fully trusted. The attack only surfaces in the site frontend (i.e. in the consuming project's templates). The Panel itself is unaffected and will not execute JavaScript that was injected into list field content.

Introduction

Cross-site scripting (XSS) is a type of vulnerability that allows to execute any kind of JavaScript code inside the site frontend or Panel session of the same or other users. In the Panel, a harmful script can for example trigger requests to Kirby's API with the permissions of the victim.

In a stored XSS attack, the malicious payload is saved into the content data and has the potential to affect other users or site visitors.

Such vulnerabilities are critical if applications might have potential attackers in their group of authenticated Panel users. They can escalate their privileges if they get access to the Panel session of an admin user. Depending on the site, other JavaScript-powered attacks are possible.

A specific class of stored XSS is auto-firing, meaning the malicious injected JavaScript code is executed by the browser when the page loads without the victim having to perform a specific action.

Affected components

Kirby's list field stores its formatted content as HTML code. Unlike with other field types, it is not possible to escape HTML special characters against cross-site scripting (XSS) attacks, otherwise the formatting would be lost.

Impact

In affected releases, Kirby did not securely sanitize the contents of list fields on save. This allowed attackers to inject malicious HTML code into the content file by sending it to Kirby's API directly without using the Panel. This malicious HTML code would then be displayed on the site frontend and executed in the browsers of site visitors and logged in users who are browsing the site.

Patches

The problem has been patched in Kirby 4.9.1 and Kirby 5.4.1. Please update to one of these or a later version to fix the vulnerability.

In all of the mentioned releases, Kirby has added HTML sanitization (like in the writer field) to the backend code that handles updates to the contents of list fields.

Credits

Kirby thanks @offset for responsibly reporting the identified issue.

Severity

8.5 (High)


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

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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 4.9.0"
      },
      "package": {
        "ecosystem": "Packagist",
        "name": "getkirby/cms"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.9.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 5.4.0"
      },
      "package": {
        "ecosystem": "Packagist",
        "name": "getkirby/cms"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.0.0"
            },
            {
              "fixed": "5.4.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-44175"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-26T23:49:56Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "### TL;DR\n\nThis vulnerability affects all Kirby sites that use the list field or list block, when content is authored by users who may not be fully trusted. The attack requires an authenticated Panel user with update permission to any list field or list block.\n\n**This vulnerability is of high severity for affected sites.**\n\nKirby sites are *not* affected if they don\u0027t use the list field (or blocks field with the list block) in any of their blueprints, or if every user who can edit content is fully trusted. The attack only surfaces in the site frontend (i.e. in the consuming project\u0027s templates). The Panel itself is unaffected and will not execute JavaScript that was injected into list field content.\n\n----\n\n### Introduction\n\nCross-site scripting (XSS) is a type of vulnerability that allows to execute any kind of JavaScript code inside the site frontend or Panel session of the same or other users. In the Panel, a harmful script can for example trigger requests to Kirby\u0027s API with the permissions of the victim.\n\nIn a *stored* XSS attack, the malicious payload is saved into the content data and has the potential to affect other users or site visitors.\n\nSuch vulnerabilities are critical if applications might have potential attackers in their group of authenticated Panel users. They can escalate their privileges if they get access to the Panel session of an admin user. Depending on the site, other JavaScript-powered attacks are possible.\n\nA specific class of stored XSS is auto-firing, meaning the malicious injected JavaScript code is executed by the browser when the page loads without the victim having to perform a specific action.\n\n### Affected components\n\nKirby\u0027s [list field](https://getkirby.com/docs/reference/panel/fields/list) stores its formatted content as HTML code. Unlike with other field types, it is not possible to [escape HTML special characters](https://getkirby.com/docs/guide/templates/escaping) against cross-site scripting (XSS) attacks, otherwise the formatting would be lost.\n\n### Impact\n\nIn affected releases, Kirby did not securely sanitize the contents of list fields on save. This allowed attackers to inject malicious HTML code into the content file by sending it to Kirby\u0027s API directly without using the Panel. This malicious HTML code would then be displayed on the site frontend and executed in the browsers of site visitors and logged in users who are browsing the site.\n\n### Patches\n\nThe problem has been patched in [Kirby 4.9.1](https://github.com/getkirby/kirby/releases/tag/4.9.1) and [Kirby 5.4.1](https://github.com/getkirby/kirby/releases/tag/5.4.1). Please update to one of these or a [later version](https://github.com/getkirby/kirby/releases) to fix the vulnerability.\n\nIn all of the mentioned releases, Kirby has added HTML sanitization (like in the writer field) to the backend code that handles updates to the contents of list fields.\n\n### Credits\n\nKirby thanks @offset for responsibly reporting the identified issue.",
  "id": "GHSA-5fhx-9q32-q257",
  "modified": "2026-05-26T23:49:56Z",
  "published": "2026-05-26T23:49:56Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/getkirby/kirby/security/advisories/GHSA-5fhx-9q32-q257"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/getkirby/kirby"
    },
    {
      "type": "WEB",
      "url": "https://github.com/getkirby/kirby/releases/tag/4.9.1"
    },
    {
      "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:L/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Kirby CMS vulnerable to cross-site scripting (XSS) from list field content in the site frontend"
}

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.

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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.
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CVE-2026-44175 (GCVE-0-2026-44175)

FKIE_CVE-2026-44175

GHSA-5FHX-9Q32-Q257

TL;DR

Introduction

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