Is there a public exploit for CVE-2026-126362?

No public exploit for CVE-2026-126362 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2026-126362?

CVE-2026-126362 scores CVSS 2.3 (v4.0), rated low. EPSS puts the chance of exploitation in the next 30 days at 0.00381%.

What does CVE-2026-126362 affect?

CVE-2026-126362 affects @astrojs/svelte.

2.3 Low

Astro: Reflected XSS via unescaped slot names in @astrojs/svelte

CVE-2026-126362

Summary The @astrojs/svelte renderer wraps slotted content passed to Svelte components in an element, and writes the slot name into its name attribute without HTML escaping. A slot name containing " could end the attribute and inject arbitrary HTML into the page. For example, a page that takes a slot name from the request: astro import Tabs from '../components/Tabs.svelte'; const tab = Astro.url.searchParams.get('tab'); … rendered with a Svelte 5 component that renders its snippets by name: svelte {@render snippets[active]?.()} would output a tab value such as x"> as live HTML. Impact Reflected cross-site scripting. An attacker who gets a user to open a crafted link can run JavaScript on the site's origin, but only in applications where all of the following are true: The page passes request-controlled input (such as a query parameter) as a slot name. The Svelte component is hydrated with a client: directive. For non-hydrated components the slot wrapper is removed from the output, together with its name attribute. The Svelte component renders the attacker-chosen slot, which in practice means a Svelte 5 component that renders snippets by a dynamic name. Components that never render…

Assessment

CVSS: 2.3 (v4.0)
Severity: Low
EPSS: 0.00381% chance of exploitation in the next 30 days
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 12 November 2026
Last updated: 12 November 2026
Affected: @astrojs/svelte
Weakness: CWE-79

CVSS vectorCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N

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