Reflected Cross-Site Scripting (XSS) vulnerability in Customer Support System

published 2025-06-16 16 mo ago modified 2026-06-17 4 mo ago also EUVD-2025-18371

cvss: 6.1; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.4%; EPSS 0.4% chance of exploitation in 30 days, percentile 34%
public exploits: 0; none known

Reflected Cross-Site Scripting (XSS) in /customer_support/index.php in Customer Support System v1.0, which allows remote attackers to execute arbitrary code via the page parameter.

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 16 mo ago (2025-06-16)

Exploit prediction

0.40% chance of exploitation in the next 30 days, higher than 34% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	4.0	4.8	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
CNA	4.0	4.8	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/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
NVD	3.1	6.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected products

Customer Support System Customer Support System

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation

References

incibe.es /en/incibe-cert/notices/aviso/multiple-vulnerabilities-customer-support-system
third-party-advisory

Sources

CVE List CVE-2025-40729
NVD CVE-2025-40729

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Summary