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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`.
Publish Date : 2021-11-26 Last Update Date : 2021-11-30
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- CVSS Scores & Vulnerability Types

CVSS Score
4.3
Confidentiality Impact None (There is no impact to the confidentiality of the system.)
Integrity Impact Partial (Modification of some system files or information is possible, but the attacker does not have control over what can be modified, or the scope of what the attacker can affect is limited.)
Availability Impact None (There is no impact to the availability of the system.)
Access Complexity Medium (The access conditions are somewhat specialized. Some preconditions must be satistified to exploit)
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s) Cross Site Scripting
CWE ID 79

- Products Affected By CVE-2021-43776

# Product Type Vendor Product Version Update Edition Language
1 Application Linuxfoundation Auth Backend * * * * Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Linuxfoundation Auth Backend 1

- References For CVE-2021-43776

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

- Metasploit Modules Related To CVE-2021-43776

There are not any metasploit modules related to this CVE entry (Please visit www.metasploit.com for more information)


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