CVE-2025-12034Network attack vector

Stored XSS via unvalidated CDN domain

Published Oct 25, 2025 · Updated Oct 25, 2025

Stored XSS in Fast Velocity Minify 3.5.1 and earlier allows remote authenticated users to inject scripts through the CDN domain setting. The fvm_save_settings function removes protocol prefixes from the saved CDN domain but accepts other non-hostname characters, while admin output renders saved settings without sufficient escaping. Exploitation requires administrator-level access and is limited to multisite installations or sites with unfiltered_html disabled; injected code runs when a user opens an affected page.

CVSS severity4.4
Medium
EPSS probability0.23%
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 Fast Velocity Minify 3.5.1 and earlier allows remote authenticated users to inject scripts through the CDN domain setting. The fvm_save_settings function removes protocol prefixes from the saved CDN domain but accepts other non-hostname characters, while admin output renders saved settings without sufficient escaping. Exploitation requires administrator-level access and is limited to multisite installations or sites with unfiltered_html disabled; injected code runs when a user opens an affected page.

The record

CVE
CVE-2025-12034
Published
Oct 25, 2025
Updated
Oct 25, 2025
Vendor
Raul Peixoto
Product
Fast Velocity Minify
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Oct 25, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 25, 2025Record 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=* <=3.5.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Raul Peixoto · Fast Velocity Minifyversion=* <=3.5.1

Published CVSS scores

4.4WordfenceCVSS:3.1/AV:N/AC:H/PR:H/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript

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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