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…
Vulnerability class: XSS (Cross-Site Scripting)
EPSS: 0.004 (30.6th 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
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Mitigation, Vendor Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com (Product, x_refsource_MISC, Release Notes)
Frequently asked questions
- What is CVE-2026-33979?
- CVE-2026-33979 is a high-severity vulnerability in Ahmedadelfahim Express-xss-sanitizer, classified under Cross-site Scripting. 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.