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CVE-2026-71415

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

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 7.1 · High · EPSS 0.4% · Fix available

Published
Updated

Stack: php

Affected products and versions

  • kirby

    Versions
    • >= 5.0.0, < 5.5.2: Affected

    No fix published

  • getkirby/cms Packagist

    Versions
    • 5.0.0
    • 5.0.1
    • 5.0.2
    • 5.0.3
    • 5.0.4
    • 5.1.0
    • 5.1.0-rc.1
    • 5.1.1
    • 5.1.2
    • 5.1.3
    • 5.1.4
    • 5.2.0
    • 5.2.0-rc.1
    • 5.2.1
    • 5.2.2
    • 5.2.3
    • 5.3.0
    • 5.3.0-rc.1
    • 5.3.1
    • 5.3.2
    • 5.3.3
    • 5.4.0
    • 5.4.1
    • 5.4.2
    • 5.4.3
    • 5.4.4
    • 5.5.0
    • 5.5.1
    Affected ranges
    • ECOSYSTEM: ≥ 5.0.0, < 5.5.2

    Update to 5.5.2

Original sources

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