# 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.

- **Severity:** High 8.5 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 31 Aug 2026
- **Updated:** 1 Sep 2026
- **Also known as:** GHSA-3vg2-cxpg-m43g

## 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 (Improper Limitation of a Pathname to a Restricted Directory)

## 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.

## Is CVE-2026-61639 being exploited?

There is no known exploitation of CVE-2026-61639 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-61639 and fix it if it is affected.

What it is: 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.
Exploitation: There is no known exploitation of CVE-2026-61639 in the wild and no public exploit code.

Affected product: ellite Wallos. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-61639/ (Markdown: https://insights.sbomify.com/CVE-2026-61639/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-61639
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-61639
- OSV: https://osv.dev/vulnerability/CVE-2026-61639

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-61639/
Summaries are generated and may contain mistakes; the official description above is the record.