CVE-2026-56128

pfSense Plus < 26.07 / CE < 2.9.0 Stored XSS via firewall_schedule_edit.php

Assigner: VulnCheck
Reserved: 18.06.2026 Published: 03.09.2026 Updated: 03.09.2026

pfSense Plus before 26.07 and CE before 2.9.0 allow authenticated users with the Firewall: Schedules: Edit privilege to inject arbitrary JavaScript via the descr parameter in /firewall_schedule_edit.php. The schedule description is stored without HTML sanitization and subsequently inserted into an HTML attribute value in /firewall_rules.php with only single-quote escaping applied, permitting double-quote breakout. The payload executes in the browser of any user with the Firewall: Rules privilege who views the rules list with the affected schedule attached.

Metrics

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
CVSS Score: 5.1

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	Low
Attack Complexity	Low	Integrity	None	Integrity	Low
Attack Requirements	None	Availability	None	Availability	None
Privileges Required	Low
User Interaction	Passive

CVSS 4.0

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
CVSS Score: 5.4

Attack Vector	Network	Scope	Changed
Attack Complexity	Low	Confidentiality Impact	Low
Privileges Required	Low	Integrity Impact	Low
User Interaction	Required	Availability Impact	None

CVSS 3.1

Product Status

Vendor	Netgate
Product	pfSense Plus
Versions	Default: unaffected affected from 0 to 26.07 (excl.)

Vendor

Netgate

Product

pfSense Plus

Versions

Default: unaffected

affected from 0 to 26.07 (excl.)

Vendor	Netgate
Product	pfSense CE
Versions	Default: affected affected from 0 to 2.9.0 (excl.)

Vendor

Netgate

Product

pfSense CE

Versions

Default: affected

affected from 0 to 2.9.0 (excl.)

Credits

Alex Williams from Pellera Technologies finder
VulnCheck coordinator

References

Problem Types