CVE-2021-43776 – @backstage/plugin-auth-backend

Package

Manager: npm
Name: @backstage/plugin-auth-backend
Vulnerable Version: >=0 <0.4.9

Severity

Level: High

CVSS v3.1: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N

CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

EPSS: 0.00311 pctl0.53669

Details

Cross-Site Scripting vulnerability in @backstage/plugin-auth-backend ### Impact This vulnerability 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. ### Patches This is vulnerability is patched in version `0.4.9` of `@backstage/plugin-auth-backend`. ### For more information If you have any questions or comments about this advisory: * Open an issue in the [Backstage repository](https://github.com/backstage/backstage) * Visit our chat, linked to in [Backstage README](https://github.com/backstage/backstage)

Metadata

Created: 2021-12-01T18:29:21Z
Modified: 2021-12-01T14:35:30Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/12/GHSA-w7fj-336r-vw49/GHSA-w7fj-336r-vw49.json
CWE IDs: ["CWE-79"]
Alternative ID: GHSA-w7fj-336r-vw49
Finding: F008
Auto approve: 1