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PHP CVE-2025-41355

| EUVDEUVD-2025-209137 MEDIUM
Cross-site Scripting (XSS) (CWE-79)
2026-03-31 INCIBE GHSA-hvcr-3gq9-w43p
XSS PHP
5.1
CVSS 4.0 · NVD
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Severity by source

NVD PRIMARY
5.1 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
A
Scope
X

Lifecycle Timeline

3
EUVD ID Assigned
Mar 31, 2026 - 09:15 euvd
EUVD-2025-209137
Analysis Generated
Mar 31, 2026 - 09:15 vuln.today
CVE Published
Mar 31, 2026 - 08:48 nvd
MEDIUM 5.1

DescriptionCVE.org

Reflected Cross-Site Scripting (XSS) vulnerability in Anon Proxy Server v0.104. This vulnerability allows an attacker to execute JavaScript code in the victim's browser by sending him/her a malicious URL. This vulnerability can be exploited to steal sensitive user data, such as session cookies, or to perform actions on behalf of the user. It affects 'port' and 'proxyPort' parameters in '/anon.php' endpoint.

AnalysisAI

Reflected Cross-Site Scripting (XSS) in Anon Proxy Server v0.104 allows unauthenticated remote attackers to execute arbitrary JavaScript in victim browsers via malicious URLs targeting the 'port' and 'proxyPort' parameters in the /anon.php endpoint. Successful exploitation enables theft of session cookies and unauthorized actions on behalf of the victim. No public exploit code or active exploitation has been confirmed at time of analysis.

Technical ContextAI

Anon Proxy Server is a PHP-based proxy application that fails to properly sanitize user-supplied input in the 'port' and 'proxyPort' parameters of the /anon.php endpoint. This allows attackers to inject arbitrary HTML and JavaScript that is reflected directly in the HTTP response without adequate output encoding. The vulnerability is rooted in CWE-79 (Improper Neutralization of Input During Web Page Generation), a fundamental flaw in web application input validation and output encoding practices. The reflected nature of this XSS means the malicious payload must be delivered via a crafted URL, but does not require stored persistence on the server.

RemediationAI

Contact the Anon Proxy Server vendor via the INCIBE advisory channel to obtain a patched version that properly sanitizes and encodes the 'port' and 'proxyPort' parameters in /anon.php. Immediate workarounds include restricting access to the proxy server to trusted networks only, implementing a Web Application Firewall (WAF) rule to detect and block JavaScript payloads in these parameters, and educating users not to click untrusted proxy links. Review the full advisory at https://www.incibe.es/en/incibe-cert/notices/aviso/reflected-cross-site-scripting-xss-anon-proxy-server for vendor-provided remediation steps and availability of patched versions.

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CVE-2025-41355 vulnerability details – vuln.today
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