CVE-2026-15518Public exploitNetwork attack vector

Authenticated code execution via unvalidated file upload

Published Jul 13, 2026 · Updated Jul 13, 2026

Arbitrary file upload in AREA 17 Twill CMS 3.6.0 and earlier allows remote authenticated users to execute code as the web server user. FileLibraryController::storeFile preserves the request-controlled qqfilename extension and stores the file on the default publicly served disk without MIME-type or extension validation. Publisher-role access is sufficient; retrieving an uploaded PHP file executes it and exposes application secrets, database access, content modification, and persistence.

CVSS severity4.7
Medium
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Arbitrary file upload in AREA 17 Twill CMS 3.6.0 and earlier allows remote authenticated users to execute code as the web server user. FileLibraryController::storeFile preserves the request-controlled qqfilename extension and stores the file on the default publicly served disk without MIME-type or extension validation. Publisher-role access is sufficient; retrieving an uploaded PHP file executes it and exposes application secrets, database access, content modification, and persistence.

The record

CVE
CVE-2026-15518
Published
Jul 13, 2026
Updated
Jul 13, 2026
Vendor
AREA 17
Product
Twill CMS
Classifications
CWE-284, CWE-434, T1505.003
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 13, 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=3.0
  2. Affected versionversion=3.1
  3. Affected versionversion=3.2
  4. Affected versionversion=3.3
  5. Affected versionversion=3.4
  6. Affected versionversion=3.5
  7. Affected versionversion=3.6.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

AREA 17 · Twill CMSversion=3.0; version=3.1; version=3.2; version=3.3; version=3.4; version=3.5; version=3.6.0

Published CVSS scores

4.7VulDBCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L
2.0VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
5.8VulDBAV:N/AC:L/Au:M/C:P/I:P/A:P

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-284Improper Access Control
CWE-434Unrestricted Upload of File with Dangerous Type
T1505.003Web Shell

Public exploit references

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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