CVE-2025-39420Network attack vector

Visitor-session script execution via stored input

Published Apr 17, 2025 · Updated Apr 28, 2026

Stored XSS in Ruud Kok WP Twitter Button 1.4.1 and earlier allows remote attackers to execute scripts in a visitor's browser. Patchstack's public record does not identify the affected field, function, or output context responsible for storing unneutralized input. Exploitation requires user interaction when a visitor loads the stored content, and the script runs in that visitor's browser context.

CVSS severity7.1
High
EPSS probability0.29%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Stored XSS in Ruud Kok WP Twitter Button 1.4.1 and earlier allows remote attackers to execute scripts in a visitor's browser. Patchstack's public record does not identify the affected field, function, or output context responsible for storing unneutralized input. Exploitation requires user interaction when a visitor loads the stored content, and the script runs in that visitor's browser context.

The record

CVE
CVE-2025-39420
Published
Apr 17, 2025
Updated
Apr 28, 2026
Vendor
Ruud Kok
Product
WP Twitter Button
Classifications
CWE-79, CAPEC-592, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 17, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 28, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=0 <=1.4.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Ruud Kok · WP Twitter Buttonversion=0 <=1.4.1

Published CVSS scores

7.1PatchstackCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L

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 11, 2026Sep 17, 2026
Latest reporting daySep 17, 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')
CAPEC-592Stored XSS
T1059.007Command and Scripting Interpreter: JavaScript

Public exploit references

No public exploit references are available in this record.

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

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo