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CVE-2026-27118— Cache poisoning in @sveltejs/adapter-vercel

Quick assessment

Affected
sveltejs kit
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.

SvelteKit是Svelte开源的一套Web 开发框架。 SvelteKit 6.3.2之前版本存在访问控制错误漏洞，该漏洞源于内部查询参数可访问，可能导致缓存投毒。

AI Predicted 7.1 Difficulty: Moderate EPSS 0.22% · P12
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I. Basic Information for CVE-2026-27118

Vulnerability Information
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Vulnerability Title
Cache poisoning in @sveltejs/adapter-vercel
Source: CVE Program / CVE List V5
Vulnerability Description
SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. Versions of @sveltejs/adapter-vercel prior to 6.3.2 are vulnerable to cache poisoning. An internal query parameter intended for Incremental Static Regeneration (ISR) is accessible on all routes, allowing an attacker to cause sensitive user-specific responses to be cached and served to other users. Successful exploitation requires a victim to visit an attacker-controlled link while authenticated. Existing deployments are protected by Vercel's WAF, but users should upgrade as soon as possible. This vulnerability is fixed in 6.3.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
源验证错误
Source: CVE Program / CVE List V5
Vulnerability Title
SvelteKit 访问控制错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
SvelteKit是Svelte开源的一套Web 开发框架。 SvelteKit 6.3.2之前版本存在访问控制错误漏洞，该漏洞源于内部查询参数可访问，可能导致缓存投毒。
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
sveltejs kit < 6.3.2 -

II. Public POCs for CVE-2026-27118

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III. Intelligence Information for CVE-2026-27118

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Same Patch Batch · sveltejs · 2026-02-20 · 5 CVEs total

CVE-2026-27119 Svelte affected by XSS in SSR `<option>` element
CVE-2026-27125 Svelte SSR attribute spreading includes inherited properties from prototype chain
CVE-2026-27122 Svelte SSR does not validate dynamic element tag names in `<svelte:element>`
CVE-2026-27121 Svelte affected by cross-site scripting via spread attributes in Svelte SSR

IV. Related Vulnerabilities

Same product: kit
Same vendor: sveltejs
Same weakness: CWE-346

V. Comments for CVE-2026-27118

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