How severe is CVE-2021-43776?

This vulnerability has a severity rating of MEDIUM with a CVSS score of 6.1 out of 10.

What type of vulnerability is CVE-2021-43776?

This is classified as CWE-79, which is a common weakness in software security.

CVE-2021-43776 - MEDIUM Severity | CVSS 6.1

Vulnerability 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`.

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