What is CVE-2020-26693?

CVE-2020-26693 is a medium-severity vulnerability in Pfsense, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2021-06-01.

How severe is CVE-2020-26693?

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

XSS in Pfsense

CVE-2020-26693

A stored cross-site scripting (XSS) vulnerability was discovered in pfSense 2.4.5-p1 which allows an authenticated attacker to execute arbitrary web scripts via exploitation of the load_balancer_monitor.php function.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2021-06-01 · last modified 2026-06-17.

CVSS v3 metric

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

EPSS exploit prediction

EPSS: 0.053 (92.3th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 92nd percentile — 92.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.053 · newest: 0.053 · change: 0.000

Affected products

Pfsense — versions 2.4.5

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

github.com/pfsense/pfsense/commit/a220a22a8c05c10a7b875ac6b565f2c4fe7b251c (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2020-26693?: CVE-2020-26693 is a medium-severity vulnerability in Pfsense, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2021-06-01.
How severe is CVE-2020-26693?: Medium severity. CVSS v3 base score is 5.4 out of 10.