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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 是一个开源的内容管理系统。在 4.9.5 和 5.5.2 之前（具体取决于发布分支），Kirby 的媒体处理程序在 和 中使用了不完整的文件系统路径包含性检查，具体体现在 和 中。该检查会接受与目标根目录共享字符串前缀的兄弟目录（例如，位于 旁边的 ），因为它未要求路径末尾必须有目录分隔符边界或完全匹配。远程攻击者可以利用 在 PHP 可读的兄弟目录中创建并访问图像文件的缩略图（前提是该目录中包含有效的 缩略图任务文件），从而可能暴露 staging 站点、备份或其他内部站点，并在处理过程中删除该任务文

CVSS 6.9 · Medium
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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

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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Other References for CVE-2026-75592 (5)

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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