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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Kirby个人开发者的一款内容管理服务。 Kirby 5.0.0版本至5.5.2之前版本存在授权问题漏洞，该漏洞源于REST API分块上传处理程序在持久化分块数据前未执行上传授权预检，可能导致已认证用户消耗临时存储、阻止其他用户上传文件或阻止站点逻辑存储数据。

CVSS 7.1 · High EPSS 0.43% · P35

Affected Version Matrix 1

VendorProduct Version RangeStatus
getkirby kirby >= 5.0.0, < 5.5.2 affected
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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
Vulnerability Title
Kirby 授权问题漏洞
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 5.0.0版本至5.5.2之前版本存在授权问题漏洞，该漏洞源于REST API分块上传处理程序在持久化分块数据前未执行上传授权预检，可能导致已认证用户消耗临时存储、阻止其他用户上传文件或阻止站点逻辑存储数据。
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 >= 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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Patches & Fixes for CVE-2026-71415 (2)

Vendor Advisories for CVE-2026-71415 (1)

Vendor Pages for CVE-2026-71415 (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-2026-75592 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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