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CVE-2026-72587— Instatic - Cache Poisoning via Unauthenticated Server Island Endpoint

Quick assessment

Affected
CoreBunch Instatic
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.

CoreBunch Instatic是CoreBunch组织的一个提供云计算服务的SaaS平台。 CoreBunch Instatic 0.0.14及之前版本存在输入验证错误漏洞，该漏洞源于对GET /_instatic/hole/<nodeId>端点中u查询参数操作不当，导致共享渲染缓存被污染，攻击者可能注入特制路由，导致后续访问者收到攻击者控制的片段内容。

CVSS 6.1 · Medium EPSS 0.32% · P24

Possible ATT&CK Techniques 1 AI

T1557 · Adversary-in-the-Middle

Affected Version Matrix 1

VendorProduct Version RangeStatus
CoreBunch Instatic ≤ 0.0.14 affected
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I. Basic Information for CVE-2026-72587

Vulnerability Information
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Vulnerability Title
Instatic - Cache Poisoning via Unauthenticated Server Island Endpoint
Source: CVE Program / CVE List V5
Vulnerability Description
A cache poisoning vulnerability in CoreBunch/Instatic through 0.0.14 allows an unauthenticated remote attacker to poison the shared process-wide render cache by manipulating the u query parameter of the GET /_instatic/hole/<nodeId> server island endpoint.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
HTTP请求的解释不一致性(HTTP请求私运)
Source: CVE Program / CVE List V5
Vulnerability Title
CoreBunch Instatic 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
CoreBunch Instatic是CoreBunch组织的一个提供云计算服务的SaaS平台。 CoreBunch Instatic 0.0.14及之前版本存在输入验证错误漏洞，该漏洞源于对GET /_instatic/hole/<nodeId>端点中u查询参数操作不当，导致共享渲染缓存被污染，攻击者可能注入特制路由，导致后续访问者收到攻击者控制的片段内容。
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
CoreBunch Instatic 0 ~ 0.0.14 -

II. Public POCs for CVE-2026-72587

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III. Intelligence Information for CVE-2026-72587

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Other References for CVE-2026-72587 (1)

IV. Related Vulnerabilities

Same weakness: CWE-444