Easy Chat Server XSS vulnerability

published 2023-10-04 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-54351

cvss: 6.1; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.4%; EPSS 0.4% chance of exploitation in 30 days, percentile 36%
public exploits: 0; none known

Easy Chat Server, in its 3.1 version and before, does not sufficiently encrypt user-controlled inputs, resulting in a Cross-Site Scripting (XSS) vulnerability stored via /body2.ghp (POST method), in the mtowho parameter.

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 2 y ago (2024-09-05)

Exploit prediction

0.42% chance of exploitation in the next 30 days, higher than 36% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	6.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
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

EFS Software Easy Chat Server

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation

References

incibe.es /en/incibe-cert/notices/aviso/multiple-vulnerabilities-efs-software-products
third-party-advisory

Sources

CVE List CVE-2023-4496
NVD CVE-2023-4496

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary