CVE-2026-27884 NetExec vulnerable to arbitrary file write via path traversal in spider_plus module
Attackers can write or overwrite arbitrary files via path traversal in SMB filenames when using the spider_plus module with download enabled.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-27884?
CVE-2026-27884 is a medium-severity path traversal vulnerability in Pennyw0rth NetExec, published on 26 Feb 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
NetExec is a network execution tool. Prior to version 1.5.1, the module spider_plus improperly creates the output file and folder path when saving files from SMB shares. It does not take into account that it is possible for Linux SMB shares to have path traversal characters such as `../` in them. An attacker can craft a filename in an SMB share that includes these characters, which when spider_plus crawls and downloads, can write or overwrite arbitrary files. The issue is patched in v1.5.1. As a workaround, do not run spider_plus with DOWNLOAD=true against targets.
Weakness: CWE-22
Which versions are affected by CVE-2026-27884?
How do I fix CVE-2026-27884?
No fix has been published for CVE-2026-27884 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-27884 being exploited?
There is no known exploitation of CVE-2026-27884 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as GHSA-fccr-6qm2-7h27.