TI-2026-08364 Aliases CVE-2026-9520 GHSA-h2p9-cr4h-px24

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

MEDIUM 57CWE-79Published 2026-05-26 · Updated 2026-05-27

Key facts

Attack vector: Network
Privileges required: None
User interaction: Passive
Attack complexity: Low
Attack requirements: None
Impact type: Cross-site scripting, Code execution
Confidentiality · integrity · availability: None · Low · None
Fix status: No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-79 and CWE-94.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00336 27th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by the CNA

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
blitz-js	blitz	3.0.0; 3.0.1; 3.0.2	—	No fix listed	CNA
—	blitz (npm)	up to 3.0.2	—	No fix listed	GHSA-h2p9-cr4h-px24

blitz Vendorblitz-js Affected 3.0.0; 3.0.1; 3.0.2 Fixed in — No fix listed CNA
blitz (npm) Vendor— Affected up to 3.0.2 Fixed in — No fix listed GHSA-h2p9-cr4h-px24

CPE names CNA · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:blitz-js:blitz::::::::	—	—	—

cpe:2.3:a:blitz-js:blitz:*:*:*:*:*:*:*:* Versions — — ·—

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product

Red Hat

Timeline

2026-10-02 Threatist record created from CVE-2026-9520
2026-10-03 Alias added: GHSA-h2p9-cr4h-px24

References

TI-2022-07683 Prototype Pollution leading to Remote Code Execution in superjson CVSS 3.1CRITICAL 9.8

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences