CVE-2026-9520

MEDIUM

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

Title source: cna

Description

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.

References (4)

Core 4

Core References

Vdb Entry, Technical Description vdb-entry technical-description

VDB-365540 | blitz-js blitz Sign-in LoginForm.tsx cross site scripting

https://vuldb.com/vuln/365540

Signature, Permissions Required signature permissions-required

VDB-365540 | CTI Indicators (IOB, IOC, TTP, IOA)

https://vuldb.com/vuln/365540/cti

Third Party Advisory third-party-advisory

Submit #814378 | BlitzJS Blitz 3.0.2 DOM-Based XSS, Open Redirect

https://vuldb.com/submit/814378

Exploit exploit

https://gist.github.com/TrebledJ/164c7ca6c8208b63e6937bc11984720b

Scores

CVSS v3 4.3

EPSS 0.0034

EPSS Percentile 25.2%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

CISA SSVC

Vulnrichment

Exploitation poc

Automatable no

Technical Impact partial

Details

CWE

CWE-79 CWE-94

Status published

Products (3)

blitz-js/blitz 3.0.0

blitz-js/blitz 3.0.1

blitz-js/blitz 3.0.2

Published May 26, 2026

Tracked Since May 26, 2026