What is CVE-2023-4090?

CVE-2023-4090 is a medium-severity vulnerability in Acilia Widestand, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2023-10-04.

How severe is CVE-2023-4090?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Is CVE-2023-4090 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

XSS in Acilia Widestand

CVE-2023-4090

Cross-site Scripting (XSS) reflected vulnerability on WideStand until 5.3.5 version, which generates one of the meta tags directly using the content of the queried URL, which would allow an attacker to inject HTML/Javascript code into the response.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2023-10-04 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.003 (21.5th percentile), scored 2026-10-05.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 22nd percentile — 21.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

Acilia Widestand
Acilia Widestand Cms — versions 0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

fkie-cad/nvd-json-data-feeds

References

www.incibe.es/en/incibe-cert/notices/aviso/cross-site-scripting-xss-vulnerabili… (Third Party Advisory)

Frequently asked questions

What is CVE-2023-4090?: CVE-2023-4090 is a medium-severity vulnerability in Acilia Widestand, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2023-10-04.
How severe is CVE-2023-4090?: Medium severity. CVSS v3 base score is 5.4 out of 10.
Is CVE-2023-4090 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.