Which versions of Youdiancms are affected by CVE-2025-3531?

Organizations using A vulnerability classified as problematic should be aware of moderate risk from CVE-2025-3531, a cross-site scripting vulnerability rated CVSS 5.3.

Is there a public PoC exploit available for CVE-2025-3531?

Yes, a public proof-of-concept exploit is available for CVE-2025-3531. Prioritise patching immediately. EPSS: 0.2%.

How to fix or mitigate CVE-2025-3531?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Verify Content-Security-Policy and output encoding.

Youdiancms CVE-2025-3531

Q: What is the CVSS score of CVE-2025-3531?

CVE-2025-3531 has a CVSS 4.0 base score of 5.3 (Medium). CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X. EPSS exploitation probability: 0.2%.

MEDIUM

Cross-site Scripting (XSS) (CWE-79)

2025-04-13 cna@vuldb.com

XSS Red Hat Youdiancms

5.3

CVSS 4.0 · NVD

Severity by source

NVD PRIMARY

5.3 MEDIUM

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Red Hat

MEDIUM

qualitative

Primary rating from NVD.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Scope

Lifecycle Timeline

Analysis Generated

Mar 28, 2026 - 18:36 vuln.today

PoC Detected

Jun 27, 2025 - 12:38 vuln.today

Public exploit code

CVE Published

Apr 13, 2025 - 06:15 nvd

MEDIUM 5.3

DescriptionCVE.org

A vulnerability classified as problematic has been found in YouDianCMS 9.5.21. This affects an unknown part of the file /App/Tpl/Admin/Default/Log/index.html. The manipulation of the argument UserName/LogType leads to cross site scripting. It is possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

AnalysisAI

A vulnerability classified as problematic has been found in YouDianCMS 9.5.21. Rated medium severity (CVSS 5.3), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.

Technical ContextAI

This vulnerability is classified as Cross-Site Scripting (XSS) (CWE-79), which allows attackers to inject malicious scripts into web pages viewed by other users. A vulnerability classified as problematic has been found in YouDianCMS 9.5.21. This affects an unknown part of the file /App/Tpl/Admin/Default/Log/index.html. The manipulation of the argument UserName/LogType leads to cross site scripting. It is possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way. Affected products include: Youdiancms.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Sanitize all user input, use Content-Security-Policy headers, encode output contextually (HTML, JS, URL). Use frameworks with built-in XSS protection.