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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.

PUBLISHED Reserved 2026-05-25 | Published 2026-05-26 | Updated 2026-05-27 | Assigner VulDB




MEDIUM: 5.3CVSS: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
MEDIUM: 4.3CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N/E:P/RL:X/RC:R
MEDIUM: 4.3CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N/E:P/RL:X/RC:R
5.0AV:N/AC:L/Au:N/C:N/I:P/A:N/E:POC/RL:ND/RC:UR

Problem types

Cross Site Scripting

Code Injection

Product status

3.0.0
affected

3.0.1
affected

3.0.2
affected

Timeline

2026-05-25:Advisory disclosed
2026-05-25:VulDB entry created
2026-05-25:VulDB entry last update

Credits

trebledj (VulDB User) reporter

VulDB CNA Team coordinator

References

vuldb.com/vuln/365540 (VDB-365540 | blitz-js blitz Sign-in LoginForm.tsx cross site scripting) vdb-entry technical-description

vuldb.com/vuln/365540/cti (VDB-365540 | CTI Indicators (IOB, IOC, TTP, IOA)) signature permissions-required

vuldb.com/submit/814378 (Submit #814378 | BlitzJS Blitz 3.0.2 DOM-Based XSS, Open Redirect) third-party-advisory

gist.github.com/TrebledJ/164c7ca6c8208b63e6937bc11984720b exploit

cve.org (CVE-2026-9520)

nvd.nist.gov (CVE-2026-9520)

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