CVE-2025-3533Public exploitNetwork attack vector

Authenticated script execution via unfiltered Parent parameter

Published Apr 13, 2025 · Updated Apr 14, 2025

Reflected XSS in YouDianCMS 9.5.21 allows remote authenticated users to execute script in a victim's browser through a crafted Parent value. ChannelAction.class.php reads Parent without filtering, and the channel index template places the value into a returned URL without output encoding. An attacker must log in and induce a victim to open the crafted response; execution is confined to the victim's browser context.

CVSS severity4.3
Medium
EPSS probability0.46%
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 YouDianCMS 9.5.21 allows remote authenticated users to execute script in a victim's browser through a crafted Parent value. ChannelAction.class.php reads Parent without filtering, and the channel index template places the value into a returned URL without output encoding. An attacker must log in and induce a victim to open the crafted response; execution is confined to the victim's browser context.

The record

CVE
CVE-2025-3533
Published
Apr 13, 2025
Updated
Apr 14, 2025
Vendor
Changsha Youdian Software Technology Co., Ltd.
Product
YouDianCMS
Classifications
CWE-94, CWE-79, T1189
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 13, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 14, 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=9.5.21

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Changsha Youdian Software Technology Co., Ltd. · YouDianCMSversion=9.5.21

Published CVSS scores

4.3VulDB CNACVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
5.0VulDB CNAAV:N/AC:L/Au:N/C:N/I:P/A:N
5.3VulDB CNACVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/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-94Improper Control of Generation of Code ('Code Injection')
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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