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CVE-2025-15265— Svelte 5.46.0 - Hydratable Key Script-Breakout XSS (SSR)

Quick assessment

Affected
Svelte Svelte
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Svelte是Svelte开源的一种构建 Web 应用程序的新方法。 Svelte 5.46.3之前版本存在跨站脚本漏洞，该漏洞源于异步水合过程中未对攻击者控制的密钥进行HTML安全转义，可能导致远程脚本执行。

AI Predicted 6.1 Difficulty: Easy EPSS 0.35% · P26

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise
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I. Basic Information for CVE-2025-15265

Vulnerability Information
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Vulnerability Title
Svelte 5.46.0 - Hydratable Key Script-Breakout XSS (SSR)
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Svelte 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Svelte是Svelte开源的一种构建 Web 应用程序的新方法。 Svelte 5.46.3之前版本存在跨站脚本漏洞，该漏洞源于异步水合过程中未对攻击者控制的密钥进行HTML安全转义，可能导致远程脚本执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Svelte Svelte 5.46.0 ~ 5.46.3 -

II. Public POCs for CVE-2025-15265

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III. Intelligence Information for CVE-2025-15265

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IV. Related Vulnerabilities

Same product: Svelte
Same weakness: CWE-79

V. Comments for CVE-2025-15265

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