CVE-2021-43776 is a cross-site scripting (XSS) vulnerability in the auth-backend plugin of Backstage, an open platform for building developer portals. A malicious actor could trick a user into visiting a specially crafted URL, leading to XSS and potential exfiltration of access tokens or other secrets. The vulnerability has a CVSS score of 6.1 (Medium), indicating a network-based attack with low complexity requiring user interaction, resulting in low confidentiality and integrity impacts. While the default Content Security Policy (CSP) mitigates this, deployments with disabled CSPs are vulnerable. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 0.4.9CPE matchmatch criteria | cpe:2.3:a:linuxfoundation:auth_backend:*:*:*:*:*:node.js:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.