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Vulnerability record · CVE-2020-26255 · published 8 December 2020

CVE-2020-26255: Getkirby kirby unrestricted file upload vulnerability

Getkirby · Kirby

Kirby is a CMS. In Kirby CMS (getkirby/cms) before version 3.4.5, and Kirby Panel before version 2.5.14 , an editor with full access to the Kirby Panel can upload a PHP .phar file and execute it on the server. This vulnerability is critical if you might have potential attackers in your group of authenticated Panel users, as they can gain access to the server with such a Phar file. Visitors without Panel access *cannot* use this attack vector. The problem has been patched in Kirby 2.5.14 and Kirby 3.4.5. Please update to one of these or a later version to fix the vulnerability. Note: Kirby 2 reaches end of life on December 31, 2020. We therefore recommend to upgrade your Kirby 2 sites to Kirby 3. If you cannot upgrade, we still recommend to update to Kirby 2.5.14.

9.1 CVSS 3.1 Critical EPSS 1.5% · top 27.0% CWE-434 · Unrestricted file upload
9.1CVSS 3.1 base score, v2 6.5
1.5%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
12References
17 Jun 2026Last modified by NVD

Description

Kirby is a CMS. In Kirby CMS (getkirby/cms) before version 3.4.5, and Kirby Panel before version 2.5.14 , an editor with full access to the Kirby Panel can upload a PHP .phar file and execute it on the server. This vulnerability is critical if you might have potential attackers in your group of authenticated Panel users, as they can gain access to the server with such a Phar file. Visitors without Panel access *cannot* use this attack vector. The problem has been patched in Kirby 2.5.14 and Kirby 3.4.5. Please update to one of these or a later version to fix the vulnerability. Note: Kirby 2 reaches end of life on December 31, 2020. We therefore recommend to upgrade your Kirby 2 sites to Kirby 3. If you cannot upgrade, we still recommend to update to Kirby 2.5.14.

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

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/getkirby-v2/panel/commit/5a569d4e3ddaea2b6628d7ec1472a3e8bc410881 PatchThird Party Advisory
https://github.com/getkirby/kirby/commit/db8f371b13036861c9cc5ba3e85e27f73fce5e09 PatchThird Party Advisory
https://github.com/getkirby/kirby/releases/tag/3.4.5 Release NotesThird Party Advisory
https://github.com/getkirby/kirby/security/advisories/GHSA-g3h8-cg9x-47qw Release NotesThird Party Advisory
https://packagist.org/packages/getkirby/cms ProductThird Party Advisory
https://packagist.org/packages/getkirby/panel ProductThird Party Advisory
https://github.com/getkirby-v2/panel/commit/5a569d4e3ddaea2b6628d7ec1472a3e8bc410881 PatchThird Party Advisory
https://github.com/getkirby/kirby/commit/db8f371b13036861c9cc5ba3e85e27f73fce5e09 PatchThird Party Advisory
https://github.com/getkirby/kirby/releases/tag/3.4.5 Release NotesThird Party Advisory
https://github.com/getkirby/kirby/security/advisories/GHSA-g3h8-cg9x-47qw Release NotesThird Party Advisory
https://packagist.org/packages/getkirby/cms ProductThird Party Advisory
https://packagist.org/packages/getkirby/panel ProductThird Party Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2020-26255), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.