CVE-2026-56126

MEDIUMPre-NVD 5.45.4—
EchelonGraph scoreMEDIUM confidence

Score 5.4 from GitHub Security Advisory published 2026-09-03. The CNA's CVSS baseline 5.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:vulncheck, epss, ghsa
Trending — 3 sources updated this week
5.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1.1%CVSS: 5.4Exploit: None knownExposed services: Not assessed

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

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 v3
5.4
EG Score
5.4MEDIUMmedium confidence
EG Risk
25
EG Risk 25/100CISA SSVC

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%
Exploitation1% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
1.1%
EPSS %ILE
63rd
KEV
Not listed

CISA SSVCTrack at every mission impact level.

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 3, 2026

Last Modified

October 1, 2026

Advisory Details (3)

Auto-updated Sep 3, 2026
No patch confirmed yet.
generic

pfSense Plus < 26.07 / CE < 2.9.0 Stored XSS via status_monitoring.php | Advisories | VulnCheck

https://www.vulncheck.com/advisories/pfsense-plus-ce-stored-xss-via-status-monitoring-php
generic

2.9.0 New Features and Changes | pfSense Documentation

https://docs.netgate.com/pfsense/en/latest/releases/2-9-0.html
generic

26.07 New Features and Changes | pfSense Documentation

https://docs.netgate.com/pfsense/en/latest/releases/26-07.html

Vendor Advisories for CVE-2026-56126(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 19× in last 7d / 78× 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. 2026-10-05 03:24 UTCEG score recompute
  2. 2026-10-05 03:24 UTCGHSA enrichment
  3. 2026-10-04 23:22 UTCEPSS rescore
  4. 2026-10-04 01:09 UTCEG score recompute
  5. 2026-10-04 01:09 UTCGHSA enrichment
  6. 2026-10-03 14:26 UTCEPSS rescore
  7. 2026-10-02 21:30 UTCEG score recompute
  8. 2026-10-02 21:30 UTCGHSA enrichment
  9. 2026-10-02 17:56 UTCEPSS rescore
  10. 2026-10-01 19:50 UTCEPSS rescore
  11. 2026-10-01 19:31 UTCEG score recompute
  12. 2026-10-01 19:31 UTCGHSA enrichment
  13. 2026-09-30 19:11 UTCEG score recompute
  14. 2026-09-30 19:10 UTCGHSA enrichment
  15. 2026-09-30 15:03 UTCEPSS rescore
  16. 2026-09-29 15:22 UTCEPSS rescore
  17. 2026-09-29 11:04 UTCEG score recompute
  18. 2026-09-29 11:04 UTCGHSA enrichment
  19. 2026-09-28 13:51 UTCEPSS rescore
  20. 2026-09-28 08:31 UTCEG score recompute
  21. 2026-09-28 08:31 UTCGHSA enrichment
  22. 2026-09-27 13:48 UTCEPSS rescore
  23. 2026-09-27 06:36 UTCEG score recompute
  24. 2026-09-27 06:36 UTCGHSA enrichment
  25. 2026-09-26 15:59 UTCEPSS rescore
Show 62 more
  1. 2026-09-26 04:21 UTCEG score recompute
  2. 2026-09-26 04:21 UTCGHSA enrichment
  3. 2026-09-25 00:29 UTCEG score recompute
  4. 2026-09-25 00:29 UTCGHSA enrichment
  5. 2026-09-24 14:04 UTCEPSS rescore
  6. 2026-09-23 22:34 UTCEG score recompute
  7. 2026-09-23 22:34 UTCGHSA enrichment
  8. 2026-09-23 17:54 UTCEPSS rescore
  9. 2026-09-22 20:39 UTCEG score recompute
  10. 2026-09-22 20:39 UTCGHSA enrichment
  11. 2026-09-21 18:44 UTCEG score recompute
  12. 2026-09-21 18:44 UTCGHSA enrichment
  13. 2026-09-20 20:16 UTCEPSS rescore
  14. 2026-09-20 16:49 UTCEG score recompute
  15. 2026-09-20 16:49 UTCGHSA enrichment
  16. 2026-09-19 14:47 UTCEG score recompute
  17. 2026-09-19 14:47 UTCGHSA enrichment
  18. 2026-09-18 19:28 UTCEPSS rescore
  19. 2026-09-18 12:53 UTCEG score recompute
  20. 2026-09-18 12:53 UTCGHSA enrichment
  21. 2026-09-17 19:31 UTCEPSS rescore
  22. 2026-09-17 10:58 UTCEG score recompute
  23. 2026-09-17 10:58 UTCGHSA enrichment
  24. 2026-09-16 14:08 UTCEPSS rescore
  25. 2026-09-16 09:03 UTCEG score recompute
  26. 2026-09-16 09:03 UTCGHSA enrichment
  27. 2026-09-16 05:15 UTCEPSS rescore
  28. 2026-09-15 06:25 UTCEG score recompute
  29. 2026-09-15 06:25 UTCGHSA enrichment
  30. 2026-09-15 03:11 UTCEPSS rescore
  31. 2026-09-14 04:30 UTCEG score recompute
  32. 2026-09-14 04:30 UTCGHSA enrichment
  33. 2026-09-13 16:47 UTCEPSS rescore
  34. 2026-09-13 02:35 UTCEG score recompute
  35. 2026-09-13 02:35 UTCGHSA enrichment
  36. 2026-09-12 00:40 UTCEG score recompute
  37. 2026-09-12 00:40 UTCGHSA enrichment
  38. 2026-09-11 14:53 UTCEPSS rescore
  39. 2026-09-10 22:45 UTCEG score recompute
  40. 2026-09-10 22:45 UTCGHSA enrichment
  41. 2026-09-10 09:35 UTCEPSS rescore
  42. 2026-09-09 20:50 UTCGHSA enrichment
  43. 2026-09-09 10:05 UTCEG score recompute
  44. 2026-09-09 10:05 UTCGHSA enrichment
  45. 2026-09-08 22:01 UTCEPSS rescore
  46. 2026-09-08 08:11 UTCEG score recompute
  47. 2026-09-08 08:11 UTCGHSA enrichment
  48. 2026-09-07 16:01 UTCEPSS rescore
  49. 2026-09-07 06:14 UTCEG score recompute
  50. 2026-09-07 06:14 UTCGHSA enrichment
  51. 2026-09-06 13:47 UTCEPSS rescore
  52. 2026-09-06 04:18 UTCEG score recompute
  53. 2026-09-06 04:18 UTCGHSA enrichment
  54. 2026-09-05 02:24 UTCEG score recompute
  55. 2026-09-05 02:23 UTCGHSA enrichment
  56. 2026-09-05 01:34 UTCEG score recompute
  57. 2026-09-05 01:34 UTCGHSA enrichment
  58. 2026-09-04 17:28 UTCEG score recompute
  59. 2026-09-04 17:28 UTCGHSA enrichment
  60. 2026-09-03 15:31 UTCEG score recompute
  61. 2026-09-03 14:35 UTCEG score recompute
  62. 2026-09-03 14:33 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-56126?
CVE-2026-56126 is a medium vulnerability published on September 3, 2026. 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,…
When was CVE-2026-56126 disclosed?
CVE-2026-56126 was first published on September 3, 2026, with the most recent update on October 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-56126 actively exploited?
CVE-2026-56126 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.1% probability of exploitation in the next 30 days (63rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-56126?
CVE-2026-56126 has a CVSS base score of 5.4 (the CNA's own assessment, by vulncheck; NVD's own analysis pending).
How do I remediate CVE-2026-56126?
No fix for CVE-2026-56126 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-56126 are linked in the Vendor Advisories panel on this page.

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