← Vulnerability feed

Vulnerability record · CVE-2020-26693 · published 1 June 2021

CVE-2020-26693: Pfsense cross-site scripting vulnerability

Pfsense · Pfsense

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.

5.4 CVSS 3.1 Medium EPSS 5.3% · top 7.7% CWE-79 · Cross-site scripting
5.4CVSS 3.1 base score, v2 3.5
5.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/pfsense/pfsense/commit/a220a22a8c05c10a7b875ac6b565f2c4fe7b251c PatchThird Party Advisory
https://github.com/pfsense/pfsense/commit/a220a22a8c05c10a7b875ac6b565f2c4fe7b251c PatchThird Party Advisory

Track CVE-2020-26693 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.9CVE-2025-69691Pfsense improper access control vulnerabilityNetgate pfSense CE 2.8.0 allows code execution in the XMLRPC API via pfsense.exec_php. NOTE: the Supplier disputes this because the API call is only …EPSS 0.68%9.8CVE-2023-29974Pfsense weak password requirements vulnerabilityAn issue discovered in Pfsense CE version 2.6.0 allows attackers to compromise user accounts via weak password requirements.EPSS 1.8%9.8CVE-2023-27100Netgate pfsense plus improper restriction of authentication attempts vulnerabilityImproper restriction of excessive authentication attempts in the SSHGuard component of Netgate pfSense Plus software v22.05.1 and pfSense CE software…EPSS 9.8%9.1CVE-2025-69690Pfsense deserialization of untrusted data vulnerabilityNetgate pfSense CE 2.7.2 allows code execution by using the module installer with a backup file with a serialized PHP object containing the post_rebo…EPSS 0.81%8.8CVE-2021-41282pfSense diag_routes.php sed injection allows arbitrary file writediag_routes.php in pfSense 2.5.2 passes netstat output through sed without preventing sed-specific code injection, even though escapeshellarg is used…EPSS 87%analysed8.8CVE-2016-10709Pfsense os command injection vulnerabilitypfSense before 2.3 allows remote authenticated users to execute arbitrary OS commands via a '|' character in the status_rrd_graph_img.php graph param…EPSS 34%7.5CVE-2020-19678Oisf suricata path traversal vulnerabilityDirectory Traversal vulnerability found in Pfsense v.2.1.3 and Pfsense Suricata v.1.4.6 pkg v.1.0.1 allows a remote attacker to obtain sensitive info…EPSS 3.5%7.5CVE-2011-4197Pfsense permissions and access controls vulnerabilityetc/inc/certs.inc in the PKI implementation in pfSense before 2.0.1 creates each X.509 certificate with a true value for the CA basic constraint, whi…EPSS 1.9%

Source: NIST National Vulnerability Database (record CVE-2020-26693), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.