CVE-2021-43776

Summary

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.

Affected Software

Weaknesses

• CWE-79: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

ADP Enrichment

CVE Program Container

Additional References

• https://github.com/backstage/backstage/security/advisories/GHSA-w7fj-336r-vw49
• https://github.com/backstage/backstage/tree/master/plugins/auth-backend

References

• https://github.com/backstage/backstage/security/advisories/GHSA-w7fj-336r-vw49
• https://github.com/backstage/backstage/tree/master/plugins/auth-backend

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