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CVE-2026-61448— Parse Server 9.0.0 Stored XSS via malformed Content-Type

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 9.0.0版本至9.10.0-alpha.2之前版本和8.6.83及之前版本存在任意文件上传漏洞，该漏洞源于mime包无法识别上传文件扩展名时保留客户端提供的Content-Type，错误的Content-Type绕过fileUpload.fileExtensions黑名单，导致浏览器回退至

AI Predicted 8.1 Difficulty: Moderate EPSS 0.24% · P16

Affected Version Matrix 4

VendorProduct Version RangeStatus
parse-community parse-server 9.0.0< 9.10.0-alpha.2 affected
9.10.0-alpha.2 unaffected
< 8.6.84 affected
8.6.84 unaffected
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I. Basic Information for CVE-2026-61448

Vulnerability Information
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Vulnerability Title
Parse Server 9.0.0 Stored XSS via malformed Content-Type
Source: CVE Program / CVE List V5
Vulnerability Description
Parse Server is affected by a stored cross-site scripting (XSS) vulnerability in versions >= 9.0.0, < 9.10.0-alpha.2 and <= 8.6.83. When an uploaded file's extension is not recognized by the mime package, Parse Server preserves the client-supplied Content-Type. A malformed Content-Type that is not a valid type/subtype media type (e.g., 'image', 'image/', or 'image//svg+xml') bypasses the fileUpload.fileExtensions blocklist and is stored unchanged. On storage adapters that persist and serve the uploaded Content-Type (such as Amazon S3, Google Cloud Storage, or Azure Blob Storage), a browser cannot parse the malformed value and falls back to MIME-sniffing; a file whose body begins with HTML is rendered as HTML, executing embedded script in the application's origin against other users who open the file URL. The default GridFS storage adapter is not affected. Fixed in 9.10.0-alpha.2 and 8.6.84.
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 9.0.0版本至9.10.0-alpha.2之前版本和8.6.83及之前版本存在任意文件上传漏洞，该漏洞源于mime包无法识别上传文件扩展名时保留客户端提供的Content-Type，错误的Content-Type绕过fileUpload.fileExtensions黑名单，导致浏览器回退至
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 ~ 9.10.0-alpha.2 -
parse-community parse-server 0 ~ 8.6.84 -

II. Public POCs for CVE-2026-61448

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III. Intelligence Information for CVE-2026-61448

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Vendor Advisories for CVE-2026-61448 (2)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-61448

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