要点
- CVE-2026-27121 是影响 svelte (svelte), svelte 的中危 (CVSS 5.4)漏洞。
- 未来 30 天内被利用的概率（EPSS）：0.22%，高于 12.6% 的漏洞。
- 修复：升级到 5.51.5 或更高版本。
| Package | Affected versions | Patched versions |
|---|
| svelte | < 5.51.5
| 5.51.5
|
| svelte npm | < 5.51.5
| 5.51.5
|
Description
Versions of svelte prior to 5.51.5 are vulnerable to cross-site scripting (XSS) during server-side rendering. When using spread syntax to render attributes from untrusted data, event handler properties are included in the rendered HTML output. If an application spreads user-controlled or external data as element attributes, an attacker can inject malicious event handlers that execute in victims' browsers.
NVD description
svelte performance oriented web framework. Versions of svelte prior to 5.51.5 are vulnerable to cross-site scripting (XSS) during server-side rendering. When using spread syntax to render attributes from untrusted data, event handler properties are included in the rendered HTML output. If an application spreads user-controlled or external data as element attributes, an attacker can inject malicious event handlers that execute in victims' browsers. This vulnerability is fixed in 5.51.5.
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