Server-Side Template Injection
Impact
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 assigned CVE-2020-26282.
Patches
Effective Immediately, all users should upgrade to version 2.1.2 or higher.
Workarounds
None.
References
https://securitylab.github.com/research/bean-validation-RCE
For more information
If you have any questions or comments about this advisory:
- Open an issue in the BrowserUp Proxy repo
- Contact us via the BrowserUp website or email us at support@browserup.com
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Java / Kotlin (Maven) | com.browserup:browserup-proxy | < 2.1.2 | 2.1.2 |
References
- https://github.com/browserup/browserup-proxy/security/advisories/GHSA-wmfg-55f9-j8hq
- https://nvd.nist.gov/vuln/detail/CVE-2020-26282
- https://github.com/browserup/browserup-proxy/commit/4b38e7a3e20917e5c3329d0d4e9590bed9d578ab
- https://github.com/browserup/browserup-proxy/releases/tag/v2.1.2
- https://securitylab.github.com/research/bean-validation-RCE
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N- Weakness (CWE)
CWE-74- Platform
- Java / Kotlin (Maven)
- Package
com.browserup:browserup-proxy- Disclosed
- 24.12.2020
- Updated
- 11.10.2026 13:19
Sources and licenses
OSV / GitHub Advisory Database - GHSA-wmfg-55f9-j8hq - CC BY 4.0
Vulnerability history: com.browserup:browserup-proxy
All published vulnerabilities of this package (Java / Kotlin (Maven)), newest first. Shows whether this is a one-off slip or a package that needs watching.
This is the only known vulnerability of this package.
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