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CVE-2025-15265

Published: Jan 15, 2026

Modified: Jan 15, 2026

PUBLISHED

Description

An SSR XSS exists in async hydration when attacker‑controlled keys are passed to hydratable. The key is embedded inside a <script> block without HTML‑safe escaping, allowing </script> to terminate the script and inject arbitrary JavaScript. This enables remote script execution in users' browsers, with potential for session theft and account compromise. This issue affects Svelte: from 5.46.0 before 5.46.3.

Vendor	Product	Versions
Svelte	Svelte	affected `5.46.0 - < 5.46.3`

Weaknesses (CWE)

References

https://fluidattacks.com/advisories/lydian

third-party-advisory

https://github.com/sveltejs/svelte/security/advisories/GHSA-6738-r8g5-qwp3

vendor-advisory

https://fluidattacks.com/advisories/lydian

patch

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