CVE-2021-43776
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`.
How to fix
- linuxfoundation auth_backend0.4.9 or later
- @backstage/plugin-auth-backend0.4.9 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linuxfoundation auth_backend | v < 0.4.9 | 0.4.9 |
| @backstage/plugin-auth-backendnpm | v < 0.4.9 | 0.4.9 |
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