CVE-2025-4392Network attack vector

Stored XSS via MIME-gated upload sanitization

Published Jun 3, 2025 · Updated Apr 8, 2026

Stored XSS in Shared Files 1.7.48 and earlier allows remote attackers to inject scripts through unauthenticated file uploads. The sanitize_file() function trusts a MIME probe and returns mismatched HTML or SVG content unchanged instead of sanitizing or rejecting it. A site must expose the frontend upload form, and the script runs in the site's origin when a visitor opens the stored file.

CVSS severity7.2
High
EPSS probability0.36%
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 Shared Files 1.7.48 and earlier allows remote attackers to inject scripts through unauthenticated file uploads. The sanitize_file() function trusts a MIME probe and returns mismatched HTML or SVG content unchanged instead of sanitizing or rejecting it. A site must expose the frontend upload form, and the script runs in the site's origin when a visitor opens the stored file.

The record

CVE
CVE-2025-4392
Published
Jun 3, 2025
Updated
Apr 8, 2026
Vendor
Anssi Laitila
Product
Shared Files
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 3, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 8, 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=0 <=1.7.48

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Anssi Laitila · Shared Filesversion=0 <=1.7.48

Published CVSS scores

7.2WordfenceCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A: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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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