CVE-2025-15265

EPSS 0.02%

svelte vulnerable to Cross-site Scripting

發布日:2026/1/15修改日:2026/2/3

描述

## Summary An XSS vulnerability exists in Svelte 5.46.0-2 resulting from improper escaping of `hydratable` keys. If these keys incorporate untrusted user input, arbitrary JavaScript can be injected into server-rendered HTML. ## Details When using the [`hydratable`](https://svelte.dev/docs/svelte/hydratable) function, the first argument is used as a key to uniquely identify the data, such that the value is not regenerated in the browser. This key is embedded into a `<script>` block in the server-rendered `<head>` without escaping unsafe characters. A malicious key can break out of the script context and inject arbitrary JavaScript into the HTML response. ## Impact This is a cross-site scripting vulnerability affecting applications that have the `experimental.async` flag enabled and use `hydratable` with keys incorporating untrusted user input. - **Impact**: Arbitrary JS execution in the client’s browser. - **Exploitability**: Remote, single-request if key is attacker-controlled. - **Typical Outcomes**: - Session/token theft - DOM defacement - CSRF bypass via injected JS - Account takeover depending on cookie/session strategy Affected applications should upgrade to a patched version immediately.

受影響套件(1)

npm/svelte>= 5.46.0, < 5.46.4

CVSS 分數

來源	版本	嚴重程度	向量
osv	CVSS 4.0	—	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

描述

受影響套件(1)

CVSS 分數

參考連結(6)