Intel

AIKIDO-2026-10668

chamilo/pclzip is vulnerable to Zip Slip

Zip Slip Pre-CVE
Found by Aikido Intel before public disclosure or CVE publication.
Published Apr 30, 2026

75

High Risk

This Affects:

PHPchamilo/pclzip
2.8.3 - 2.8.4
Fixed in 2.8.5
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TL;DR

Affected versions of this package are vulnerable to Zip Slip / Zip Traversal attacks during archive extraction. An attacker can craft a malicious zip archive containing files with '../' or '..\' in their filenames, allowing extraction routines to write files outside the intended extraction directory. This can result in overwriting critical files or writing to restricted locations on the file system.

Who does this affect?

You are affected if you are using a version that falls within the vulnerable range.

Background info

chamilo/pclzip is vulnerable to Zip Slip in versions 2.8.3 - 2.8.4.

How to fix this

Upgrade the chamilo/pclzip library to the patch version.