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CVE-2026-71415— Kirby: File upload permissions are not checked during processing of chunk data

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（CMS）。在 5.0.0 到 5.5.2 版本中，Kirby 的 REST API 分块上传处理器（位于 ）在将分块数据持久化之前，未执行相关的上传授权预检。具体来说，在调用 之前， 中本应执行的上传授权预检未被执行。 一个拥有 权限但禁用了 、 和 权限的已认证用户，可以通过发送带有 请求头的请求，在 目录中留下未完成的分块文件，这些文件会保留 24 小时。重复执行此过程可能会消耗攻击者可用的临时存储空间，阻止其他用户上传文件，或阻止站点逻辑存储数据。不过，最终的权限检查仍然

CVSS 7.1 · High
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I. Basic Information for CVE-2026-71415

Vulnerability Information
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Vulnerability Title
Kirby: File upload permissions are not checked during processing of chunk data
Source: CVE Program / CVE List V5
Vulnerability Description
Kirby is an open-source content management system. From 5.0.0 until 5.5.2, Kirby's REST API chunk upload handler in src/Api/Upload.php did not run the relevant upload authorization preflight in Kirby\Api\Upload::process() before Kirby\Api\Upload::processChunk() persisted chunk data. An authenticated user with the access.panel permission enabled but with files.create, files.replace, and user/users.update permissions disabled could submit requests with an Upload-Length header and leave unfinished chunks in site/cache/.uploads for 24 hours. Repeating this process could consume attacker-controlled temporary storage, prevent other users from uploading files, or prevent site logic from storing data, although final permission checks still prevented unauthorized files from reaching the content or site/accounts directories. This issue is fixed in version 5.5.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
getkirby kirby >= 5.0.0, < 5.5.2 -

II. Public POCs for CVE-2026-71415

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III. Intelligence Information for CVE-2026-71415

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Other References for CVE-2026-71415 (4)

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-2026-75592 6.9 MEDIUM Kirby: Access to image files outside of the site root via path traversal in the media hand

IV. Related Vulnerabilities

Same product: kirby
Same vendor: getkirby
Same weakness: CWE-862

V. Comments for CVE-2026-71415

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