PT-2026-43177 · Blitz.Js · Blitz.Js

Trebledj · Published 2026-05-26 · Updated 2026-05-26 · CVE-2026-9520

Positive Technologies (AI Summary)

CVSS v2.0

5.0

Medium

Base vector

AV:N/AC:L/Au:N/C:N/I:P/A:N

Name of the Vulnerable Software and Affected Versions blitz-js blitz versions prior to 3.0.3

Description A cross-site scripting issue exists in the Sign-in component within the file packages/generator/templates/app/src/app/auth/components/LoginForm.tsx. A remote attacker can initiate an attack by manipulating the Next argument. Cross-site scripting is a technique where malicious scripts are injected into trusted websites.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

XSS

Code Injection

Weakness Enumeration

CWE-79

CWE-94

Related Identifiers

CVE-2026-9520

GHSA-H2P9-CR4H-PX24

Affected Products

Blitz.Js

References · 8

• 🔥 https://gist.github.com/TrebledJ/164c7ca6c8208b63e6937bc11984720b · Exploit
• https://osv.dev/vulnerability/GHSA-h2p9-cr4h-px24 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-9520 · Security Note
• https://github.com/blitz-js/blitz · Note
• https://vuldb.com/submit/814378 · Note
• https://vuldb.com/vuln/365540 · Note
• https://t.me/CVEtracker/54943 · Telegram Post
• https://vuldb.com/vuln/365540/cti · Note