CVE-2026-9520CWE-79CWE-94

blitz-js blitz Sign-in LoginForm.tsx cross site scripting

Medium · published May 26, 2026

CVSS v4.0
5.3
EPSS
0%
Percentile
38.0
In the wild
Unconfirmed
What it is

A weakness has been identified in blitz-js blitz up to 3.0.2 on GitHub. This impacts an unknown function of the file packages/generator/templates/app/src/app/auth/components/LoginForm.tsx of the component Sign-in. This manipulation of the argument Next causes cross site scripting. It is possible to initiate the attack remotely. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.

The record
Technical detail
CVSS v4.0
5.3 · MEDIUM
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P
EPSS
0.00449 · 38.0th percentile
Weaknesses
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'); CWE-94 · Improper Control of Generation of Code ('Code Injection')
Published
2026-05-26T01:30Z
EPSS history
Timeline
  • 26 MAY 01:30Z
    blitz-js blitz Sign-in LoginForm.tsx cross site scripting
    cvelistv5