CVE-2026-61639 Wallos: Zip Slip path traversal in database restore writes files to webroot
An admin can upload a crafted zip file to write a webshell to the webroot, enabling remote code execution.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-61639?
CVE-2026-61639 is a high-severity path traversal vulnerability in ellite Wallos, published on 31 Aug 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
Wallos is an open-source, self-hostable personal subscription tracker. Prior to version 4.9.6, POST /endpoints/db/restore.php calls ZipArchive::extractTo() without validating entry names for ../ sequences. Admin uploads crafted zip with entry logos/../../endpoints/shell.php to write webshell to webroot. Extension filter only applies to post-extraction logo copy step. This issue has been patched in version 4.9.6.
Weakness: CWE-22
Which versions are affected by CVE-2026-61639?
How do I fix CVE-2026-61639?
No fix has been published for CVE-2026-61639 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-2026-61639 being exploited?
There is no known exploitation of CVE-2026-61639 in the wild and no public exploit code.
Sources
Also known as GHSA-3vg2-cxpg-m43g.