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`.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linuxfoundation | Auth Backend | < 0.4.9 |
Related Weaknesses (CWE)
References
- https://github.com/backstage/backstage/security/advisories/GHSA-w7fj-336r-vw49Third Party Advisory
- https://github.com/backstage/backstage/tree/master/plugins/auth-backendProductThird Party Advisory
- https://github.com/backstage/backstage/security/advisories/GHSA-w7fj-336r-vw49Third Party Advisory
- https://github.com/backstage/backstage/tree/master/plugins/auth-backendProductThird Party Advisory
FAQ
What is CVE-2021-43776?
CVE-2021-43776 is a vulnerability with a CVSS score of 7.4 (HIGH). 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 a...
How severe is CVE-2021-43776?
CVE-2021-43776 has been rated HIGH with a CVSS base score of 7.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-43776?
Check the references section above for vendor advisories and patch information. Affected products include: Linuxfoundation Auth Backend.