Description
Backstage is an open platform for building developer portals. In affected versions the auth-backend plugin allows a malicious actor to trick another user into visiting a vulnerable URL that executes an XSS attack. This attack can potentially allow the attacker to exfiltrate access tokens or other secrets from the user's browser. The default CSP does prevent this attack, but it is expected that some deployments have these policies disabled due to incompatibilities. This is vulnerability is patched in version `0.4.9` of `@backstage/plugin-auth-backend`.
Remediation
References
https://github.com/backstage/backstage/security/advisories/GHSA-w7fj-336r-vw49
https://github.com/backstage/backstage/tree/master/plugins/auth-backend
Related Vulnerabilities
CVE-2017-0928 Vulnerability in npm package html-janitor
CVE-2021-28100 Vulnerability in maven package com.netflix.priam:priam
CVE-2023-45884 Vulnerability in npm package openmct
CVE-2017-11341 Vulnerability in maven package org.webjars.npm:node-sass
CVE-2019-3773 Vulnerability in maven package org.springframework.ws:spring-ws-core