What is CVE-2021-41317?

CVE-2021-41317 is a critical-severity vulnerability in Xss Hunter Express Project, classified under Improper Authentication. CVSS score: 9.8/10. Published 2021-09-17.

How severe is CVE-2021-41317?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Auth bypass in Xss Hunter Express Project

CVE-2021-41317

XSS Hunter Express before 2021-09-17 does not properly enforce authentication requirements for paths.

Vulnerability class: Broken Authentication

Published 2021-09-17 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.018 (77.3th percentile), scored 2026-10-07.

Low probability of exploitation in the next 30 days, but still tracked. 77th percentile — 77.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.018 · newest: 0.018 · change: 0.000

Affected products

Xss Hunter Express Project

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

github.com/mandatoryprogrammer/xsshunter-express/commit/56bb44ed9024849f64173f7… (Patch, Third Party Advisory)
docs.google.com/document/d/12rq4YIFZLSmZlEsq7d7hYCI1qO5xyIxA1Wrs1m4y9-4/preview (Third Party Advisory, Mitigation)
vuln.ryotak.me/advisories/57 (Third Party Advisory)

Frequently asked questions

What is CVE-2021-41317?: CVE-2021-41317 is a critical-severity vulnerability in Xss Hunter Express Project, classified under Improper Authentication. CVSS score: 9.8/10. Published 2021-09-17.
How severe is CVE-2021-41317?: Critical severity. CVSS v3 base score is 9.8 out of 10.