CVE-2026-9520
blitz-js blitz Sign-in LoginForm.tsx cross site scripting
Vexday Risk Score
33Attention
SSVC decision (CISA)
Attend
PoC available → attend closely
CVSS 5.3EPSS 0.3%KEV nãoPoC públicaNuclei —Metasploit —Patch —
Lifecycle
26 May 2026Published on NVD
Recommendation: Plan a near-term fix — a public PoC already exists.
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.
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
Affected products
blitz-js · blitzpublic PoCs found — 1
cve_referencegist.github.com/TrebledJ/164c7ca6c8208b63e6937bc11984720bunverified⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
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