How to fix CVE-2025-8521?

During next maintenance window: Identify affected systems running givanz Vvveb and apply vendor patches when convenient. Verify Content-Security-Policy and output encoding.

Is PHP affected by CVE-2025-8521?

Organizations using givanz Vvveb should be aware of moderate risk from CVE-2025-8521, a cross-site scripting vulnerability rated CVSS 4.8. Attackers could inject scripts to steal sessions or perform actions as authenticated users. Proof-of-concept code is publicly available.

CVE-2025-8521

MEDIUM

2025-08-04 [email protected]

4.8

CVSS 4.0

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/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

High

User Interaction

Scope

Lifecycle Timeline

Analysis Generated

Mar 28, 2026 - 19:05 vuln.today

Patch Released

Mar 28, 2026 - 19:05 nvd

Patch available

PoC Detected

Aug 27, 2025 - 16:21 vuln.today

Public exploit code

CVE Published

Aug 04, 2025 - 19:15 nvd

MEDIUM 4.8

Description

A vulnerability, which was classified as problematic, has been found in givanz Vvveb up to 1.0.5. This issue affects some unknown processing of the file /vadmin123/index.php?module=settings/post-types of the component Add Type Handler. The manipulation leads to cross site scripting. The attack may be initiated remotely. The exploit has been disclosed to the public and may be used. Upgrading to version 1.0.6 is able to address this issue. The patch is named b53c7161da606f512b7efcb392d6ffc708688d49/605a70f8729e4d44ebe272671cb1e43e3d6ae014. It is recommended to upgrade the affected component.

Analysis

A vulnerability, which was classified as problematic, has been found in givanz Vvveb up to 1.0.5.php?module=settings/post-types of the component Add Type Handler. Rated medium severity (CVSS 4.8), this vulnerability is remotely exploitable, low attack complexity. Public exploit code available.

Technical Context

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, which was classified as problematic, has been found in givanz Vvveb up to 1.0.5.php?module=settings/post-types of the component Add Type Handler. The manipulation leads to cross site scripting. The attack may be initiated remotely. The exploit has been disclosed to the public and may be used. Upgrading to version 1.0.6 is able to address this issue. The patch is named b53c7161da606f512b7efcb392d6ffc708688d49/605a70f8729e4d44ebe272671cb1e43e3d6ae014. It is recommended to upgrade the affected component. Affected products include: Vvveb. Version information: up to 1.0.5..

Affected Products

Vvveb.

Remediation

A vendor patch is available. Apply the latest security update as soon as possible. Sanitize all user input, use Content-Security-Policy headers, encode output contextually (HTML, JS, URL). Use frameworks with built-in XSS protection.

Priority Score

Low Medium High Critical

KEV: 0

EPSS: +0.0

CVSS: +24

POC: +20

CVE-2025-8521 vulnerability details – vuln.today

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CVE-2025-8521

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CVE-2025-8521

CVSS Vector

Lifecycle Timeline

Tags

Description

Analysis

Technical Context

Affected Products

Remediation

Priority Score

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External POC / Exploit Code