What is CVE-2023-43763?

CVE-2023-43763 is a medium-severity vulnerability in Withsecure F-Secure Policy Manager, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2023-09-22.

How severe is CVE-2023-43763?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Is CVE-2023-43763 known to be exploited?

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

XSS in Withsecure F-Secure Policy Manager

CVE-2023-43763

Certain WithSecure products allow XSS via an unvalidated parameter in the endpoint. This affects WithSecure Policy Manager 15 on Windows and Linux.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2023-09-22 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.004 (26.9th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 27th percentile — 26.9% 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: 0.004 · change: +0.000

Affected products

Withsecure F-Secure Policy Manager — versions 15.00

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

fkie-cad/nvd-json-data-feeds

References

www.withsecure.com/en/support/security-advisories (Vendor Advisory)
www.withsecure.com/en/support/security-advisories/cve-2023-nnn (Broken Link)

Frequently asked questions

What is CVE-2023-43763?: CVE-2023-43763 is a medium-severity vulnerability in Withsecure F-Secure Policy Manager, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2023-09-22.
How severe is CVE-2023-43763?: Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2023-43763 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.