XSS in Ahmedadelfahim Express-xss-sanitizer

CVE-2026-33979

Express XSS Sanitizer is Express 4.x and 5.x middleware which sanitizes user input data (in req.body, req.query, req.headers and req.params) to prevent Cross Site Scripting (XSS) attack. A vulnerability has been identified in versions prio…

EPSS: 0.000 (5.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-33979?
CVE-2026-33979 is a high-severity vulnerability in Ahmedadelfahim Express-xss-sanitizer, classified under CWE-183. CVSS score: 8.2/10. Published 2026-03-27.
How severe is CVE-2026-33979?
High severity. CVSS v3 base score is 8.2 out of 10.