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CVE-2026-61448

Parse Server 9.0.0 Stored XSS via malformed Content-Type

LOW
2.1
CVSS Score
Published: July 11, 2026 at 01:01 PM UTC
Updated: October 24, 2026 at 01:10 PM UTC
2 products affected across 2 vendorsParse ServerParse Server

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Severity
LOW2.1
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Parse Server· Parseplatformnpm
95%
v < 8.6.849.0.0 ≤ v < 9.10.0-alpha.2
Affected range stops below 8.6.84, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.10.0-alpha.2, so it looks safe — our inference, not a vendor statement
Parse Server· Parse Communitynpm
90%
0 ≤ v < 8.6.849.0.0 ≤ v < 9.10.0-alpha.209.0.0
Vendor states this is fixed in 8.6.84 (unaffected)
Vendor states this is fixed in 9.10.0-alpha.2 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

Vendor Advisory
Source: cverecord
https://github.com/parse-community/parse-server/security/advisories/GHSA-r899-h629-j84r
Third Party Advisory
Source: cverecord
https://www.vulncheck.com/advisories/parse-server-stored-xss-via-malformed-content-type

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

2.1LOWVulnCheck
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-434

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