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CVE-2026-75592— Kirby: Access to image files outside of the site root via path traversal in the media handling

Quick assessment

Affected
getkirby kirby
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Kirby是Kirby个人开发者的一款内容管理服务。 Kirby 4.9.5之前版本和5.0.0至5.5.2之前版本存在路径遍历漏洞，该漏洞源于文件系统包含检查不完整，远程攻击者可能通过Kirby\Cms\Media::thumb()创建和访问PHP可读兄弟目录中图像文件的缩略图，暴露暂存站点、备份或其他内部站点，并删除作业文件。

CVSS 6.9 · Medium EPSS 0.68% · P51

Affected Version Matrix 2

VendorProduct Version RangeStatus
getkirby kirby < 4.9.5 affected
>= 5.0.0, < 5.5.2 affected
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I. Basic Information for CVE-2026-75592

Vulnerability Information
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Vulnerability Title
Kirby: Access to image files outside of the site root via path traversal in the media handling
Source: CVE Program / CVE List V5
Vulnerability Description
Kirby is an open-source content management system. Prior to 4.9.5 and 5.5.2, depending on the release line, Kirby's media handler used incomplete filesystem containment checks in src/Filesystem/Dir.php and src/Filesystem/F.php through Kirby\Filesystem\Dir::realpath() and Kirby\Filesystem\F::realpath(). The checks accepted a sibling directory whose path shared the intended root's string prefix, such as /var/www/site2 next to /var/www/site, because they did not require an exact match or a DIRECTORY_SEPARATOR boundary. A remote attacker could use Kirby\Cms\Media::thumb() to create and access thumbnails from image files in a PHP-readable sibling directory when that directory contained a valid .json thumbnail job file, potentially exposing staging sites, backups, or other internal sites and deleting the job file during processing. This issue is fixed in versions 4.9.5 and 5.5.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
Kirby 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Kirby是Kirby个人开发者的一款内容管理服务。 Kirby 4.9.5之前版本和5.0.0至5.5.2之前版本存在路径遍历漏洞，该漏洞源于文件系统包含检查不完整，远程攻击者可能通过Kirby\Cms\Media::thumb()创建和访问PHP可读兄弟目录中图像文件的缩略图，暴露暂存站点、备份或其他内部站点，并删除作业文件。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
getkirby kirby < 4.9.5 -

II. Public POCs for CVE-2026-75592

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III. Intelligence Information for CVE-2026-75592

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Patches & Fixes for CVE-2026-75592 (3)

Vendor Advisories for CVE-2026-75592 (1)

Vendor Pages for CVE-2026-75592 (1)

Same Patch Batch · getkirby · 2026-08-31 · 3 CVEs total

CVE-2026-75594 8.2 HIGH Kirby: Access to image files and limited access to JSON files outside of the site root via
CVE-2026-71415 7.1 HIGH Kirby: File upload permissions are not checked during processing of chunk data

IV. Related Vulnerabilities

Same product: kirby
Same vendor: getkirby
Same weakness: CWE-22

V. Comments for CVE-2026-75592

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