CVE-2026-41203Public exploitNetwork attack vector

Authenticated code execution via unchecked ZIP entries

Published May 7, 2026 · Updated May 7, 2026

Path traversal in CI4MS before 0.31.5.0 allows remote authenticated users to execute code by uploading a crafted theme ZIP archive. Theme::upload passes the archive directly to ZipArchive::extractTo without checking whether entry paths escape writable/tmp. Theme-create permission is required; a traversal entry can place an executable PHP file in the public web root and compromise the server.

CVSS severity9.4
Critical
EPSS probability0.48%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in CI4MS before 0.31.5.0 allows remote authenticated users to execute code by uploading a crafted theme ZIP archive. Theme::upload passes the archive directly to ZipArchive::extractTo without checking whether entry paths escape writable/tmp. Theme-create permission is required; a traversal entry can place an executable PHP file in the public web root and compromise the server.

The record

CVE
CVE-2026-41203
Published
May 7, 2026
Updated
May 7, 2026
Vendor
Ci4MS
Product
CI4MS
Classifications
CWE-22, T1505.003
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 7, 2026CVE publishedPublication date reported by the CVE source.
  2. May 7, 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=< 0.31.5.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Ci4MS · CI4MSversion=< 0.31.5.0

Published CVSS scores

9.4GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

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.

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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 exploitPublished

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1505.003Server Software Component: Web 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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