CVE-2020-26282

Name: CVE-2020-26282
Creator: NVD / NIST
Published: 2020-12-24T21:15:12.727+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 10/10EPSS 4.63%

Last modified Jun 17, 2026

CVE-2020-26282 is a critical-severity vulnerability rated 10/10 on the CVSS scale. 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. EPSS estimates a 4.63% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

10/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

EPSS Probability

4.63%

90.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-74

Affected Software

Vendor	Product	Versions
Browserup	Browserup Proxy	< 2.1.2

References

https://github.com/browserup/browserup-proxy/commit/4b38e7a3e20917e5c3329d0d4e9590bed9d578abPatch, Third Party Advisory
https://github.com/browserup/browserup-proxy/releases/tag/v2.1.2Third Party Advisory
https://github.com/browserup/browserup-proxy/security/advisories/GHSA-wmfg-55f9-j8hqThird Party Advisory
https://securitylab.github.com/research/bean-validation-RCEExploit, Third Party Advisory
https://github.com/browserup/browserup-proxy/commit/4b38e7a3e20917e5c3329d0d4e9590bed9d578abPatch, Third Party Advisory
https://github.com/browserup/browserup-proxy/releases/tag/v2.1.2Third Party Advisory
https://github.com/browserup/browserup-proxy/security/advisories/GHSA-wmfg-55f9-j8hqThird Party Advisory
https://securitylab.github.com/research/bean-validation-RCEExploit, Third Party Advisory

Timeline

Published: Dec 24, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-26282?

How severe is CVE-2020-26282?

CVE-2020-26282 has a CVSS score of 10/10 (CRITICAL severity). The EPSS model estimates a 4.63% probability of exploitation in the next 30 days.

How do I fix CVE-2020-26282?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-26282?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST