Vulnerability Details CVE-2021-43776
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`.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 52.3%
CVSS Severity
CVSS v3 Score 7.4
CVSS v2 Score 4.3
References
- https://github.com/backstage/backstage/security/advisories/GHSA-w7fj-336r-vw49
- https://github.com/backstage/backstage/tree/master/plugins/auth-backend
- https://github.com/backstage/backstage/security/advisories/GHSA-w7fj-336r-vw49
- https://github.com/backstage/backstage/tree/master/plugins/auth-backend
Products affected by CVE-2021-43776
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cpe:2.3:a:linuxfoundation:auth_backend:0.1.1
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cpe:2.3:a:linuxfoundation:auth_backend:0.2.0
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cpe:2.3:a:linuxfoundation:auth_backend:0.2.1
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cpe:2.3:a:linuxfoundation:auth_backend:0.2.10
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cpe:2.3:a:linuxfoundation:auth_backend:0.2.11
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cpe:2.3:a:linuxfoundation:auth_backend:0.2.12
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cpe:2.3:a:linuxfoundation:auth_backend:0.2.2
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cpe:2.3:a:linuxfoundation:auth_backend:0.2.3
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cpe:2.3:a:linuxfoundation:auth_backend:0.2.4
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cpe:2.3:a:linuxfoundation:auth_backend:0.2.5
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cpe:2.3:a:linuxfoundation:auth_backend:0.2.6
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cpe:2.3:a:linuxfoundation:auth_backend:0.2.7
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cpe:2.3:a:linuxfoundation:auth_backend:0.2.8
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cpe:2.3:a:linuxfoundation:auth_backend:0.2.9
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cpe:2.3:a:linuxfoundation:auth_backend:0.3.0
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cpe:2.3:a:linuxfoundation:auth_backend:0.3.1
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cpe:2.3:a:linuxfoundation:auth_backend:0.3.10
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cpe:2.3:a:linuxfoundation:auth_backend:0.3.11
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cpe:2.3:a:linuxfoundation:auth_backend:0.3.12
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cpe:2.3:a:linuxfoundation:auth_backend:0.3.13
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cpe:2.3:a:linuxfoundation:auth_backend:0.3.14
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cpe:2.3:a:linuxfoundation:auth_backend:0.3.15
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cpe:2.3:a:linuxfoundation:auth_backend:0.3.16
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cpe:2.3:a:linuxfoundation:auth_backend:0.3.17
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cpe:2.3:a:linuxfoundation:auth_backend:0.3.18
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cpe:2.3:a:linuxfoundation:auth_backend:0.3.19
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cpe:2.3:a:linuxfoundation:auth_backend:0.3.2
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cpe:2.3:a:linuxfoundation:auth_backend:0.3.20
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cpe:2.3:a:linuxfoundation:auth_backend:0.3.21
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cpe:2.3:a:linuxfoundation:auth_backend:0.3.22
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cpe:2.3:a:linuxfoundation:auth_backend:0.3.23
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cpe:2.3:a:linuxfoundation:auth_backend:0.3.24
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cpe:2.3:a:linuxfoundation:auth_backend:0.3.3
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cpe:2.3:a:linuxfoundation:auth_backend:0.3.4
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cpe:2.3:a:linuxfoundation:auth_backend:0.3.5
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cpe:2.3:a:linuxfoundation:auth_backend:0.3.6
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cpe:2.3:a:linuxfoundation:auth_backend:0.3.7
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cpe:2.3:a:linuxfoundation:auth_backend:0.3.8
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cpe:2.3:a:linuxfoundation:auth_backend:0.3.9
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cpe:2.3:a:linuxfoundation:auth_backend:0.4.0
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cpe:2.3:a:linuxfoundation:auth_backend:0.4.1
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cpe:2.3:a:linuxfoundation:auth_backend:0.4.2
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cpe:2.3:a:linuxfoundation:auth_backend:0.4.3
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cpe:2.3:a:linuxfoundation:auth_backend:0.4.4
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cpe:2.3:a:linuxfoundation:auth_backend:0.4.5
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cpe:2.3:a:linuxfoundation:auth_backend:0.4.6
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cpe:2.3:a:linuxfoundation:auth_backend:0.4.7
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cpe:2.3:a:linuxfoundation:auth_backend:0.4.8