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CVE-2026-53724— Parse Server: Stored XSS via trailing-dot filename bypassing file upload extension blocklist

Quick assessment

Affected
parse-community parse-server
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.

Parse Platform Parse Server是Parse Platform组织开源的一个开源后端,可以部署到任何可以运行 Node.js 的基础设施。 Parse Platform parse server 8.6.79之前版本和9.9.1-alpha.4之前版本存在任意文件上传漏洞，该漏洞源于默认文件上传扩展名阻止列表可通过在文件名后附加点号绕过，导致扩展名为空字符串而绕过检测，存储适配器将攻击者控制的Content-Type原样传递，从而在受害者打开文件URL时导致存储型跨站脚本攻击。

AI Predicted 8.6 Difficulty: Easy EPSS 0.28% · P21

Affected Version Matrix 2

VendorProduct Version RangeStatus
parse-community parse-server < 8.6.79 affected
>= 9.0.0, < 9.9.1-alpha.4 affected
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I. Basic Information for CVE-2026-53724

Vulnerability Information
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Vulnerability Title
Parse Server: Stored XSS via trailing-dot filename bypassing file upload extension blocklist
Source: CVE Program / CVE List V5
Vulnerability Description
Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.79 and 9.9.1-alpha.4, the default file upload extension blocklist can be bypassed by appending a trailing dot to a filename whose extension would otherwise be blocked (e.g. poc.svg.). The trailing dot causes the extension parser to extract an empty string, which short-circuits the blocklist check, and the attacker-controlled Content-Type is forwarded to the storage adapter unchanged. Storage adapters that persist and serve the provided Content-Type (such as S3 or GCS) then serve the file with an active type such as image/svg+xml, enabling stored XSS when a victim opens the file URL. The default GridFS adapter is not affected because it sets X-Content-Type-Options: nosniff on responses. This issue has been patched in versions 8.6.79 and 9.9.1-alpha.4.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
危险类型文件的不加限制上传
Source: CVE Program / CVE List V5
Vulnerability Title
Parse Platform parse server 任意文件上传漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Parse Platform Parse Server是Parse Platform组织开源的一个开源后端,可以部署到任何可以运行 Node.js 的基础设施。 Parse Platform parse server 8.6.79之前版本和9.9.1-alpha.4之前版本存在任意文件上传漏洞，该漏洞源于默认文件上传扩展名阻止列表可通过在文件名后附加点号绕过，导致扩展名为空字符串而绕过检测，存储适配器将攻击者控制的Content-Type原样传递，从而在受害者打开文件URL时导致存储型跨站脚本攻击。
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
parse-community parse-server < 8.6.79 -

II. Public POCs for CVE-2026-53724

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III. Intelligence Information for CVE-2026-53724

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Patches & Fixes for CVE-2026-53724 (2)

Vendor Advisories for CVE-2026-53724 (1)

Same Patch Batch · parse-community · 2026-06-12 · 6 CVEs total

CVE-2026-53726 Parse Server: Relation `$relatedTo` query bypasses `protectedFields` and owning-object ACL
CVE-2026-53725 Parse Server: Endpoints `/login` and `/verifyPassword` disclose MFA secrets and protected
CVE-2026-47248 Parse Server: GraphQL "Did you mean" validation suggestions disclose schema to unauthentic
CVE-2026-47138 Parse Server: Pre-authentication denial of service via client version header regex backtra
CVE-2026-50008 Parse Server: Server option routeAllowList is bypassable through batch sub-requests

IV. Related Vulnerabilities

Same product: parse-server
Same vendor: parse-community
Same weakness: CWE-434

V. Comments for CVE-2026-53724

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