Authenticated code execution via unrestricted PHP upload
Published Jul 20, 2026 · Updated Jul 20, 2026
Unrestricted file upload in JCD.PL Windu CMS 4.1 allows remote authenticated users to execute PHP code through the administration panel. The upload path accepts attacker-supplied files without validating their type, so a PHP payload can be stored where the web server executes it. Authentication is required; the published advisory does not identify the affected upload handler or the account role needed to reach it.
Summary
What happened
Unrestricted file upload in JCD.PL Windu CMS 4.1 allows remote authenticated users to execute PHP code through the administration panel. The upload path accepts attacker-supplied files without validating their type, so a PHP payload can be stored where the web server executes it. Authentication is required; the published advisory does not identify the affected upload handler or the account role needed to reach it.
The record
- CVE
- CVE-2026-57311
- Published
- Jul 20, 2026
- Updated
- Jul 20, 2026
- Vendor
- JCD.PL
- Product
- Windu CMS
- Classifications
- CWE-434, CAPEC-1, T1505.003
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jul 20, 2026CVE publishedPublication date reported by the CVE source.
- Jul 20, 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.
- Affected versionversion=4.1
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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