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8.6

KodExplorer allows attackers to overwrite files via ZIP upload

CVE-2026-104081 · published 26 days ago
Summary

If a user can log into KodExplorer, they could upload a specially crafted ZIP file that replaces important site files. This can let an attacker take over admin accounts and run malicious code on the server. Upgrade to version 4.55 or later and limit who can upload files to prevent the issue.

What to do
  • Update kalcaddle kodexplorer to version 4.55 or later.
Affected software
VendorProductAffected versions
kalcaddle kodexplorer < 4.55
Original advisory text
KodExplorer < 4.55 Path Traversal via unzip_pre_name() ZIP Extraction
KodExplorer before 4.55 contains a path traversal vulnerability in the unzip_pre_name() function within app/function/helper.function.php, where a single non-recursive str_replace() sanitization pass can be bypassed using crafted filenames like "....//", combined with PclZip's extract() call in KodArchive.class.php lacking the PCLZIP_OPT_EXTRACT_DIR_RESTRICTION option. Authenticated attackers can upload a malicious ZIP archive with traversal sequences to overwrite arbitrary files such as core JavaScript assets, enabling stored XSS that leads to admin account takeover and subsequent remote code execution via unrestricted PHP file upload.
References
Fix within
Internet-facing 14 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker full control
Severity
8.6 High
Exploitation
<1% chance of attack within 30 days
Type
CWE-22Path Traversal
Timeline
Published9 Oct 2026
Updated4 Nov 2026
First seen9 Oct 2026
Sources
CVE-2026-104081 · NVD
CVE-2026-104081 · MITRE
CVE-2026-104081 · OSV
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