CVE-2026-32728Public exploitNetwork attack vector

Stored XSS via MIME parsing and blocklist gaps

Published Mar 18, 2026 · Updated Mar 18, 2026

Stored XSS in Parse Server before 8.6.41 and 9.0.0 through 9.6.0-alpha.14 allows remote authenticated users to steal browser data. The file router derives an extension from the full Content-Type value without removing MIME parameters, and its default blocklist omits script-capable XML extensions. File-upload permission and a victim opening the stored content are required; successful execution exposes browser-held sessions, credentials, and local-storage data.

CVSS severity8.3
High
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Parse Server before 8.6.41 and 9.0.0 through 9.6.0-alpha.14 allows remote authenticated users to steal browser data. The file router derives an extension from the full Content-Type value without removing MIME parameters, and its default blocklist omits script-capable XML extensions. File-upload permission and a victim opening the stored content are required; successful execution exposes browser-held sessions, credentials, and local-storage data.

The record

CVE
CVE-2026-32728
Published
Mar 18, 2026
Updated
Mar 18, 2026
Vendor
Parse Platform
Product
Parse Server
Classifications
CWE-79, T1189
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 18, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 8.6.41
  2. Affected versionversion=>= 9.0.0, < 9.6.0-alpha.15

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Parse Platform · Parse Serverversion=< 8.6.41; version=>= 9.0.0, < 9.6.0-alpha.15

Published CVSS scores

7.6NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N
8.3GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:L/VA:N/SC:H/SI:L/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1189Drive-by Compromise

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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