CVE-2026-78849

MEDIUMPre-NVD 5.45.4—
EchelonGraph scoreHIGH confidence

Score 5.4 from GitHub Security Advisory published 2026-09-04. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 5.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this weekElevated
5.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 5.4Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Cross Site Scripting vulnerability in Netgate pfSense Plus software versions <= 26.03 pfSense CE software versions <= 2.8.1 allows a remote attacker to execute arbitrary code via the captive_portal_status.widget.php file

CVSS v3
5.4
EG Score
5.4(high)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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 computed
Severity54% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
40%
KEV
Not listed

Published

September 4, 2026

Last Modified

September 14, 2026

Advisory Details (2)

Auto-updated Sep 14, 2026
No patch confirmed yet.
generic
https://docs.netgate.com/downloads/pfSense-SA-26_05.webgui.asc
generic

Bug #16773: Potential XSS in Captive Portal widget - pfSense - pfSense bugtracker

https://redmine.pfsense.org/issues/16773

Vendor Advisories for CVE-2026-78849(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 22× in last 7d / 48× 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.

  1. 2026-09-25 09:09 UTCEG score recompute
  2. 2026-09-25 09:09 UTCGHSA enrichment
  3. 2026-09-24 14:04 UTCEPSS rescore
  4. 2026-09-24 09:41 UTCEG score recompute
  5. 2026-09-24 09:41 UTCGHSA enrichment
  6. 2026-09-23 17:54 UTCEPSS rescore
  7. 2026-09-23 10:15 UTCEG score recompute
  8. 2026-09-23 10:15 UTCGHSA enrichment
  9. 2026-09-22 16:01 UTCEPSS rescore
  10. 2026-09-22 10:48 UTCEG score recompute
  11. 2026-09-22 10:48 UTCGHSA enrichment
  12. 2026-09-21 21:09 UTCEPSS rescore
  13. 2026-09-21 11:21 UTCEG score recompute
  14. 2026-09-21 11:21 UTCGHSA enrichment
  15. 2026-09-20 20:16 UTCEPSS rescore
  16. 2026-09-20 11:55 UTCEG score recompute
  17. 2026-09-20 11:55 UTCGHSA enrichment
  18. 2026-09-19 12:24 UTCEG score recompute
  19. 2026-09-19 12:24 UTCGHSA enrichment
  20. 2026-09-18 19:28 UTCEPSS rescore
  21. 2026-09-18 12:58 UTCEG score recompute
  22. 2026-09-18 12:58 UTCGHSA enrichment
  23. 2026-09-17 13:31 UTCEG score recompute
  24. 2026-09-17 13:31 UTCGHSA enrichment
  25. 2026-09-16 14:08 UTCEPSS rescore
Show 23 more
  1. 2026-09-16 13:58 UTCEG score recompute
  2. 2026-09-16 13:58 UTCGHSA enrichment
  3. 2026-09-16 05:15 UTCEPSS rescore
  4. 2026-09-15 13:59 UTCEG score recompute
  5. 2026-09-15 13:59 UTCGHSA enrichment
  6. 2026-09-15 03:12 UTCEPSS rescore
  7. 2026-09-15 03:12 UTCEPSS rescore
  8. 2026-09-14 14:32 UTCEG score recompute
  9. 2026-09-14 14:32 UTCGHSA enrichment
  10. 2026-09-14 13:30 UTCEG score recompute▲ 5.40
  11. 2026-09-14 13:30 UTCGHSA enrichment
  12. 2026-09-14 13:29 UTCMITRE cvelistV5CVSS v3 → 5.4 · severity → MEDIUM
  13. 2026-09-12 00:26 UTCGHSA enrichment
  14. 2026-09-11 14:53 UTCEPSS rescore
  15. 2026-09-11 14:53 UTCEPSS rescore
  16. 2026-09-08 22:01 UTCEPSS rescore
  17. 2026-09-08 19:59 UTCGHSA enrichment
  18. 2026-09-07 21:55 UTCEG score recompute
  19. 2026-09-07 21:55 UTCGHSA enrichment
  20. 2026-09-06 13:48 UTCEPSS rescore
  21. 2026-09-04 17:24 UTCNVD update
  22. 2026-09-04 16:39 UTCEG score recompute
  23. 2026-09-04 16:39 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-78849?
CVE-2026-78849 is a medium vulnerability published on September 4, 2026. Cross Site Scripting vulnerability in Netgate pfSense Plus software versions <= 26.03 pfSense CE software versions <= 2.8.1 allows a remote attacker to execute arbitrary code via the captiveportalstatus.widget.php file
When was CVE-2026-78849 disclosed?
CVE-2026-78849 was first published in the National Vulnerability Database on September 4, 2026, with the most recent update on September 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-78849 actively exploited?
CVE-2026-78849 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 59.8% of all scored CVEs.
What is the CVSS score of CVE-2026-78849?
CVE-2026-78849 has a CVSS v3.1 base score of 5.4 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-78849?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-78849, 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-2026-78849

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