pfSense Plus before 26.07 and pfSense CE through 2.8.1 contain a stored cross-site scripting vulnerability in the Traffic Graphs top-talkers feature, where PTR records returned by reverse DNS lookups are incorporated without sanitization into AJAX responses and rendered as HTML through a DOM sink in the administrator interface. An attacker who controls a PTR record and generates sufficient traffic to appear as a top talker can execute arbitrary JavaScript in an administrator's browser, gaining access to the authenticated session context and same-origin access to the firewall management interface, enabling account creation and arbitrary OS command execution.
CVE-2026-67189
MEDIUMPre-NVD 6.16.1—Trending — 4 sources updated this week
EchelonGraph scoreHIGH confidence
Score 6.1 from GitHub Security Advisory published 2026-08-19. a secondary CVSS source baseline 6.1; sources differ by 0.0.
Triggered by: GitHub Security Advisory CVSS
Sources: ghsa, secondary
6.1EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 6.1Exploit: None knownExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 6.1
- EG Score
- 6.1(high)
- EG Risk
- 32(Track)EG Risk 32/100SSVC: Track
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity61% × 45%Exploitation0% × 40%Automatability30% × 15%Action: Routine — remediate on your standard cadence. - EPSS PROB
- 1%
- EPSS %ILE
- 43%
- KEV
- Not listed
Published
August 19, 2026
Last Modified
August 19, 2026
Advisory Details (4)
Auto-updated Aug 19, 2026No patch confirmed yet.
generic
pfSense Plus/CE Stored XSS via Traffic Graphs PTR Record | Advisories | VulnCheck
https://www.vulncheck.com/advisories/pfsense-plus-ce-stored-xss-via-traffic-graphs-ptr-recordgeneric
2.9.0 New Features and Changes | pfSense Documentation
https://docs.netgate.com/pfsense/en/latest/releases/2-9-0.htmlgeneric
26.07 New Features and Changes | pfSense Documentation
https://docs.netgate.com/pfsense/en/latest/releases/26-07.htmlVendor Advisories for CVE-2026-67189(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 6× in last 7d / 6× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-08-20 22:56 UTCEPSS rescore
- 2026-08-20 19:12 UTCEG score recompute
- 2026-08-20 19:12 UTCGHSA enrichment
- 2026-08-19 20:21 UTCEG score recompute
- 2026-08-19 19:33 UTCEG score recompute
- 2026-08-19 19:32 UTCMITRE cvelistV5first tracked
Frequently asked(5)
What is CVE-2026-67189?
CVE-2026-67189 is a medium vulnerability published on August 19, 2026. pfSense Plus before 26.07 and pfSense CE through 2.8.1 contain a stored cross-site scripting vulnerability in the Traffic Graphs top-talkers feature, where PTR records returned by reverse DNS lookups are incorporated without sanitization into AJAX responses and rendered as HTML through a DOM sink…
When was CVE-2026-67189 disclosed?
CVE-2026-67189 was first published in the National Vulnerability Database on August 19, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-67189 actively exploited?
CVE-2026-67189 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 57.4% of all scored CVEs.
What is the CVSS score of CVE-2026-67189?
CVE-2026-67189 has a CVSS v3 base score of 6.1 (NVD).
How do I remediate CVE-2026-67189?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-67189, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-67189
Is Your Infrastructure Affected by CVE-2026-67189?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.