CVE-2026-82673 Path traversal in AshAdmin file uploads via unsanitized client filename
Attacker can write arbitrary files via unsanitized upload filenames, potentially achieving remote code execution in AshAdmin applications.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-82673?
CVE-2026-82673 is a high-severity path traversal vulnerability in ash-project ash_admin, published on 31 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Improper Limitation of a Pathname to a Restricted Directory (Path Traversal) vulnerability in ash-project ash_admin allows writing attacker-controlled bytes to arbitrary paths on the server.
AshAdmin.Components.Resource.Form.consume_file_uploads/1 builds the destination as Path.join([tmp_dir, entry.client_name]) and writes it with File.cp!/2. entry.client_name is the browser-supplied filename and is not sanitized, and Path.join/1 does not normalize ... An upload named ../../../../var/www/app/priv/static/x.png therefore escapes the random temp directory and lands anywhere the BEAM user can write, enabling arbitrary file write and potentially remote code execution by overwriting application assets, configuration, or cron/ssh files. The only guard is an extension allowlist defaulting to :any that checks only the extension. The fix strips path components with Path.basename/1 before joining.
This issue affects ash_admin: from 0.13.7 before 1.3.1.
Weakness: CWE-22
Which versions are affected by CVE-2026-82673?
1 open source package ship an affected version, including ash_admin.
| Package | Affected | Fixed in |
|---|---|---|
ash_admin Hex | From 0.13.7 | 1.3.1 |
How do I fix CVE-2026-82673?
Upgrade ash_admin to 1.3.1 or later.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-82673 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-82673 exists.
Sources
Also known as EEF-CVE-2026-82673, GHSA-483p-rgcq-p5j9.