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CVE-2026-55778— Parse Server: Stored XSS via non-standard file extension 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 9.9.1-alpha.11之前版本和8.6.81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黑名单可被绕过，通过上传非标准或复合扩展名及危险内容类型的文件，可能导致存储型跨站脚本攻击。

AI Predicted 6.1 Difficulty: Easy EPSS 0.55% · P44

Affected Version Matrix 2

VendorProduct Version RangeStatus
parse-community parse-server >= 9.0.0-alpha.1, < 9.9.1-alpha.11 affected
< 8.6.81 affected
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I. Basic Information for CVE-2026-55778

Vulnerability Information
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Vulnerability Title
Parse Server: Stored XSS via non-standard file extension 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 9.9.1-alpha.11 and 8.6.81, the default fileUpload.fileExtensions blocklist could be bypassed by uploading a file with a non-standard or compound extension and dangerous content type, allowing storage adapters such as S3 and GCS to serve attacker-supplied active content and enable stored cross-site scripting. This issue is fixed in versions 9.9.1-alpha.11 and 8.6.81.
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 9.9.1-alpha.11之前版本和8.6.81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黑名单可被绕过，通过上传非标准或复合扩展名及危险内容类型的文件，可能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 >= 9.0.0-alpha.1, < 9.9.1-alpha.11 -

II. Public POCs for CVE-2026-55778

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III. Intelligence Information for CVE-2026-55778

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Patches & Fixes for CVE-2026-55778 (4)

Vendor Advisories for CVE-2026-55778 (1)

Vendor Pages for CVE-2026-55778 (2)

Same Patch Batch · parse-community · 2026-07-08 · 3 CVEs total

CVE-2026-57480 Parse Server: Denial of service via exponential-time processing of deeply nested query ope
CVE-2026-57481 Parse Server: LiveQuery discloses object data to a subscriber across an ACL read-access ch

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-55778

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