Medium severity · published Sep 3, 2026
CVE-2026-56126
pfSense Plus < 26.07 / CE < 2.9.0 Stored XSS via status_monitoring.php
5.4
CVSS
1.1%
EPSS
No
On KEV
Description
pfSense Plus before 26.07 and CE before 2.9.0 allow authenticated users with the Status: Monitoring privilege to inject arbitrary JavaScript via graph configuration parameters in /status_monitoring.php. Multiple POST parameters including graph-left, graph-right, time-period, resolution, start-date, end-date, start-time, end-time, graph-type, invert, and refresh-interval are concatenated and written to the global pfSense XML configuration without sanitization, then echoed unsanitized into a JavaScript string context on page render. Because the setting is stored in the global configuration, the payload executes in the browser of every user who visits the Status: Monitoring page.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)1.1% · higher than 64% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PC
pfSense CE · Netgate
before 2.9.0 · source: vendor
PP
pfSense Plus · Netgate
before 26.07 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-56126
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-56126
vendor-advisory
https://docs.netgate.com/downloads/pfSense-SA-26_09.packages.asc
release-notes
https://docs.netgate.com/pfsense/en/latest/releases/26-07.html
release-notes
https://docs.netgate.com/pfsense/en/latest/releases/2-9-0.html
third-party-advisory
https://www.vulncheck.com/advisories/pfsense-plus-ce-stored-xss-via-status-monitoring-php
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