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PHP EUVD-2026-21852

| CVE-2026-6159 LOW
Cross-site Scripting (XSS) (CWE-79)
2026-04-13 VulDB GHSA-hh82-cfxx-fmf9
PHP XSS
2.1
CVSS 4.0 · NVD

Severity by source

NVD PRIMARY
2.1 LOW
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: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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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: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
None
User Interaction
P
Scope
X

Lifecycle Timeline

8
Severity Changed
Apr 29, 2026 - 01:11 NVD
MEDIUM LOW
CVSS changed
Apr 29, 2026 - 01:11 NVD
5.3 (MEDIUM) 2.1 (LOW)
PoC Detected
Apr 29, 2026 - 01:00 vuln.today
Public exploit code
Analysis Generated
Apr 13, 2026 - 05:27 vuln.today
CVSS changed
Apr 13, 2026 - 05:22 NVD
4.3 (MEDIUM) 5.3 (MEDIUM)
EUVD ID Assigned
Apr 13, 2026 - 05:15 euvd
EUVD-2026-21852
Analysis Generated
Apr 13, 2026 - 05:15 vuln.today
CVE Published
Apr 13, 2026 - 04:15 nvd
LOW 2.1

DescriptionCVE.org

A vulnerability has been found in code-projects Simple ChatBox up to 1.0. Affected by this vulnerability is an unknown functionality of the file /chatbox/insert.php of the component Endpoint. Such manipulation of the argument msg leads to cross site scripting. The attack may be performed from remote. The exploit has been disclosed to the public and may be used.

AnalysisAI

Cross-site scripting (XSS) in Simple ChatBox up to version 1.0 allows remote attackers to inject malicious scripts via the msg parameter in the /chatbox/insert.php endpoint, with user interaction required. The vulnerability has publicly available exploit code and affects the PHP-based chat application component. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Attacker crafts XSS payload
Delivery
Sends malicious msg parameter to insert.php
Exploit
Server stores unsanitized input
Execution
Victim views chat message
Persist
JavaScript executes in victim browser
Impact
Attacker steals session or credentials
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Vulnerability AssessmentAI

Risk Assessment CVSS 5.3 with AV:N/AC:L/PR:N indicates remote, unauthenticated, low-complexity attack with user interaction required. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker crafts a malicious chat message containing JavaScript payload in the msg parameter (e.g., <script>alert('XSS')</script>) and sends it to /chatbox/insert.php. When other users view the chat or when a moderator reviews messages, the injected script executes in their browser context, potentially stealing session cookies, stealing credentials, or performing actions on behalf of the victim user. …
Remediation Upgrade Simple ChatBox to a patched version if available from code-projects.org. … Detailed patch versions, workarounds, and compensating controls in full report.
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EUVD-2026-21852 vulnerability details – vuln.today
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