CVE-2021-39310Network attack vector

Browser script execution via unescaped PHP_SELF

Published Dec 14, 2021 · Updated Jan 31, 2025

Reflected XSS in Windy Road Real WYSIWYG 0.0.2 and earlier allows remote attackers to run scripts through a crafted URL. In real-wysiwyg.php, the plugin places attacker-controlled PHP_SELF path data into generated HTML without escaping it. The injected script executes only when a user follows the crafted request, exposing or altering data available to that browser session.

CVSS severity6.1
Medium
EPSS probability0.76%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in Windy Road Real WYSIWYG 0.0.2 and earlier allows remote attackers to run scripts through a crafted URL. In real-wysiwyg.php, the plugin places attacker-controlled PHP_SELF path data into generated HTML without escaping it. The injected script executes only when a user follows the crafted request, exposing or altering data available to that browser session.

The record

CVE
CVE-2021-39310
Published
Dec 14, 2021
Updated
Jan 31, 2025
Vendor
Windy Road
Product
Real WYSIWYG
Classifications
CWE-79, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 14, 2021CVE publishedPublication date reported by the CVE source.
  2. Jan 31, 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=0.0.2 <=0.0.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Windy Road · Real WYSIWYGversion=0.0.2 <=0.0.2

Published CVSS scores

6.1WordfenceCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/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.

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204.001Malicious Link

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

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Your stack

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