CVE-2026-84191

MEDIUMPre-NVD 6.16.1—
EchelonGraph scoreHIGH confidence

Score 6.1 from GitHub Security Advisory published 2026-09-01. a secondary CVSS source baseline 6.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
6.1EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.1Exploit: None knownExposed: 0

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

LibreNMS before 26.5.0 contains stored cross-site scripting vulnerabilities in VRF display pages where mplsVpnVrfDescription, vrf_name, and mplsVpnVrfRouteDistinguisher fields from SNMP polling are rendered without sanitization. Attackers controlling a monitored network device can inject arbitrary JavaScript through SNMP responses that executes in the browser of any user viewing VRF-related pages.

CVSS v3
6.1
EG Score
6.1(high)
EG Risk
43(Track)
EG Risk 43/100SSVC: 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
Severity61% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
16%
KEV
Not listed

Published

September 1, 2026

Last Modified

September 8, 2026

Advisory Details (2)

Auto-updated Sep 1, 2026
🔬 Proof of concept available. Patch available. Sources: github.
generic

LibreNMS before 26.5.0 Stored XSS via SNMP VRF fields | Advisories | VulnCheck

https://www.vulncheck.com/advisories/librenms-before-26.5.0-stored-xss-via-snmp-vrf-fields
github Patch Available🟡 PoC Available

Stored XSS via SNMP-sourced VRF data in routing/VRF display pages · Advisory · librenms/librenms · GitHub

https://github.com/librenms/librenms/security/advisories/GHSA-g993-wffj-m3gv

Vendor Advisories for CVE-2026-84191(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 20× in last 7d / 68× 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 07:40 UTCEG score recompute
  2. 2026-09-25 07:40 UTCGHSA enrichment
  3. 2026-09-24 14:04 UTCEPSS rescore
  4. 2026-09-24 07:08 UTCEG score recompute
  5. 2026-09-24 07:08 UTCGHSA enrichment
  6. 2026-09-23 17:54 UTCEPSS rescore
  7. 2026-09-23 06:37 UTCEG score recompute
  8. 2026-09-23 06:37 UTCGHSA enrichment
  9. 2026-09-22 16:01 UTCEPSS rescore
  10. 2026-09-22 06:06 UTCEG score recompute
  11. 2026-09-22 06:06 UTCGHSA enrichment
  12. 2026-09-21 21:09 UTCEPSS rescore
  13. 2026-09-21 05:34 UTCEG score recompute
  14. 2026-09-21 05:34 UTCGHSA enrichment
  15. 2026-09-20 20:16 UTCEPSS rescore
  16. 2026-09-20 05:00 UTCEG score recompute
  17. 2026-09-20 05:00 UTCGHSA enrichment
  18. 2026-09-19 04:28 UTCEG score recompute
  19. 2026-09-19 04:28 UTCGHSA enrichment
  20. 2026-09-18 19:28 UTCEPSS rescore
  21. 2026-09-18 03:57 UTCEG score recompute
  22. 2026-09-18 03:57 UTCGHSA enrichment
  23. 2026-09-17 19:32 UTCEPSS rescore
  24. 2026-09-17 03:25 UTCEG score recompute
  25. 2026-09-17 03:25 UTCGHSA enrichment
Show 43 more
  1. 2026-09-16 14:09 UTCEPSS rescore
  2. 2026-09-16 05:15 UTCEPSS rescore
  3. 2026-09-16 02:53 UTCEG score recompute
  4. 2026-09-16 02:53 UTCGHSA enrichment
  5. 2026-09-15 03:12 UTCEPSS rescore
  6. 2026-09-15 03:12 UTCEPSS rescore
  7. 2026-09-15 02:21 UTCGHSA enrichment
  8. 2026-09-14 01:46 UTCEG score recompute
  9. 2026-09-14 01:46 UTCGHSA enrichment
  10. 2026-09-13 01:15 UTCEG score recompute
  11. 2026-09-13 01:15 UTCGHSA enrichment
  12. 2026-09-12 00:43 UTCEG score recompute
  13. 2026-09-12 00:43 UTCGHSA enrichment
  14. 2026-09-11 14:53 UTCEPSS rescore
  15. 2026-09-11 14:53 UTCEPSS rescore
  16. 2026-09-11 00:11 UTCEG score recompute
  17. 2026-09-11 00:11 UTCGHSA enrichment
  18. 2026-09-09 23:39 UTCEG score recompute
  19. 2026-09-09 23:39 UTCGHSA enrichment
  20. 2026-09-08 22:01 UTCEPSS rescore
  21. 2026-09-08 20:51 UTCGHSA enrichment
  22. 2026-09-07 18:56 UTCEG score recompute
  23. 2026-09-07 18:56 UTCGHSA enrichment
  24. 2026-09-06 18:25 UTCEG score recompute
  25. 2026-09-06 18:25 UTCGHSA enrichment
  26. 2026-09-06 13:48 UTCEPSS rescore
  27. 2026-09-05 17:53 UTCEG score recompute
  28. 2026-09-05 17:53 UTCGHSA enrichment
  29. 2026-09-05 15:31 UTCEPSS rescore
  30. 2026-09-04 17:19 UTCEG score recompute
  31. 2026-09-04 17:18 UTCGHSA enrichment
  32. 2026-09-04 05:07 UTCEPSS rescore
  33. 2026-09-03 16:45 UTCGHSA enrichment
  34. 2026-09-02 16:12 UTCEG score recompute
  35. 2026-09-02 16:12 UTCGHSA enrichment
  36. 2026-09-02 14:12 UTCEPSS rescore
  37. 2026-09-01 15:40 UTCEG score recompute
  38. 2026-09-01 15:40 UTCGHSA enrichment
  39. 2026-09-01 15:04 UTCEG score recompute
  40. 2026-09-01 15:04 UTCGHSA enrichment
  41. 2026-09-01 12:26 UTCEG score recompute
  42. 2026-09-01 11:43 UTCEG score recompute
  43. 2026-09-01 11:41 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-84191?
CVE-2026-84191 is a medium vulnerability published on September 1, 2026. LibreNMS before 26.5.0 contains stored cross-site scripting vulnerabilities in VRF display pages where mplsVpnVrfDescription, vrf_name, and mplsVpnVrfRouteDistinguisher fields from SNMP polling are rendered without sanitization. Attackers controlling a monitored network device can inject arbitrary…
When was CVE-2026-84191 disclosed?
CVE-2026-84191 was first published in the National Vulnerability Database on September 1, 2026, with the most recent update on September 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-84191 actively exploited?
CVE-2026-84191 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 83.9% of all scored CVEs.
What is the CVSS score of CVE-2026-84191?
CVE-2026-84191 has a CVSS v3 base score of 6.1 (NVD).
How do I remediate CVE-2026-84191?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-84191, 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

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