CVE-2026-71415Network attack vectorHinoki check available

Authenticated service interruption via unchecked chunk storage

Published Aug 31, 2026 · Updated Sep 3, 2026

Missing authorization in Content Folder Kirby 5.0.0 through 5.5.1 allows remote authenticated users to interrupt service via chunk uploads. Kirby\Api\Upload::process() invoked processChunk() without the upload-permission preflight, allowing unfinished data to remain in site/cache/.uploads for 24 hours. Exploitation requires Panel access but no upload rights; repeated requests can exhaust temporary storage, while final checks still protect content and account files.

CVSS severity7.1
High
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Missing authorization in Content Folder Kirby 5.0.0 through 5.5.1 allows remote authenticated users to interrupt service via chunk uploads. Kirby\Api\Upload::process() invoked processChunk() without the upload-permission preflight, allowing unfinished data to remain in site/cache/.uploads for 24 hours. Exploitation requires Panel access but no upload rights; repeated requests can exhaust temporary storage, while final checks still protect content and account files.

The record

CVE
CVE-2026-71415
Published
Aug 31, 2026
Updated
Sep 3, 2026
Vendor
Content Folder
Product
Kirby
Classifications
CWE-862, T1499.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 31, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 3, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 5.0.0, < 5.5.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Content Folder · Kirbyversion=>= 5.0.0, < 5.5.2

Published CVSS scores

6.5GitLab Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.1GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization
T1499.001OS Exhaustion Flood

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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