What is CVE-2021-37524?

CVE-2021-37524 is a medium-severity vulnerability in Fusionpbx, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2022-07-01.

How severe is CVE-2021-37524?

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

XSS in Fusionpbx

CVE-2021-37524

Cross Site Scripting (XSS) vulnerability in FusionPBX 4.5.26 allows remote unauthenticated users to inject arbitrary web script or HTML via an unsanitized "path" parameter in resources/login.php.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2022-07-01 · 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: 0.008 (53.6th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 54th percentile — 53.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.008 · change: +0.000

Affected products

Fusionpbx

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

www.fusionpbx.com/app/tickets/ticket_edit.php (Permissions Required, Vendor Advisory)
github.com/fusionpbx/fusionpbx/commit/c3b811393de63e324eaa64fe5c9ea3fce428fe1a (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2021-37524?: CVE-2021-37524 is a medium-severity vulnerability in Fusionpbx, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2022-07-01.
How severe is CVE-2021-37524?: Medium severity. CVSS v3 base score is 6.1 out of 10.