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Next.js CSP-nonce reflected XSS (CVE-2026-44581) detection

🗓️ 12 May 2026 15:30:27Reported by KittySploitType 
kittysploit
 kittysploit
🔗 kittysploit.com👁 5 Views

Next.js CSP-nonce reflected XSS allows XSS.

Related
Refs
Code
#!/usr/bin/env python3
# -*- coding: utf-8 -*-

from kittysploit import *
from lib.protocols.http.http_client import Http_client
from lib.scanner.http.nextjs_probe import run_nextjs_version_scan


class Module(Scanner, Http_client):
    __info__ = {
        "name": "Next.js CSP-nonce reflected XSS (CVE-2026-44581) detection",
        "description": (
            "Fingerprints Next.js and flags versions < 16.2.5 affected by CVE-2026-44581 "
            "(CSP nonce reflected XSS)."
        ),
        "author": ["KittySploit Team"],
        "severity": "high",
        "cve": "CVE-2026-44581",
        "references": ["https://github.com/advisories/GHSA-44581"],
        "modules": [
            "auxiliary/scanner/http/nextjs_cve_2026_44581_csp_nonce_reflected_xss"],
        "tags": ["scanner", "nextjs", "xss", "csp", "cve-2026-44581"],
    'agent': {
        'risk': 'active',
        'effects': ['network_probe'],
        'expected_requests': 1,
        'reversible': True,
        'approval_required': False,
        'produces': ['tech_hints', 'risk_signals', 'endpoints'],
        'cost': 1.0,
        'noise': 0.2,
        'value': 1.0,
        'requires':         {'min_endpoints': 0,
         'min_params': 0,
         'tech_hints_any': [],
         'tech_hints_all': [],
         'specializations_any': [],
         'risk_signals_any': [],
         'auth_session': False,
         'capabilities_any': [],
         'capabilities_all': [],
         'confidence_min': {},
         'confidence_min_any': {},
         'endpoint_pattern_any': [],
         'param_any': [],
         'api_surface_ready': False},
        'chain':         {'produces_capabilities': [{'capability': 'risk_signal', 'from_detail': ''}],
         'consumes_capabilities': [],
         'option_bindings': {},
         'suggested_followups': []},
    },
    }

    def run(self):
        return run_nextjs_version_scan(
            self,
            cve="CVE-2026-44581",
            patched_version="16.2.5",
            issue_label="CVE-2026-44581 CSP nonce reflected XSS",
            severity="high",
        )

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05 Aug 2026 13:34Current
5.4Medium risk
Vulners AI Score5.4
CVSS 3.14.7
EPSS0.00248
SSVC
5